CODES

ADOPTS WITH AMENDMENTS:

International Residential Code 2015 (IRC 2015)

Part I ‒ Administrative

Chapter 1 Scope and Administration

Part II ‒ Definitions

Chapter 2 Definitions

Part III ‒ Building Planning and Construction

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Part IV ‒ Energy Conservation

Chapter 11 [RE] Energy Efficiency

Part V ‒ Mechanical

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment and Appliances

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Appliances, Equipment and Systems

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Fuel oil Piping and Storage Systems

Chapter 23 Solar Thermal Energy Systems

Part VI ‒ Fuel Gas

Chapter 24 Fuel Gas

Part VII ‒ Plumbing

Chapter 25 Plumbing Administration

Chapter 26 General Plumbing Requirements

Chapter 27 Plumbing Fixtures

Chapter 28 Water Heaters

Chapter 29 Water Supply and Distribution

Chapter 30 Sanitary Drainage

Chapter 31 Vents

Chapter 32 Traps

Chapter 33 Storm Drainage

Part VIII ‒ Electrical

Chapter 34 General Requirements

Chapter 34 GENERAL REQUIREMENTS

Chapter 35 Electrical Definitions

Chapter 35 ELECTRICAL DEFINITIONS

Chapter 36 Services

Chapter 36 SERVICES

Chapter 37 Branch Circuit and Feeder Requirements

Chapter 37 BRANCH CIRCUIT AND FEEDER REQUIREMENTS

Chapter 38 Wiring Methods

Chapter 38 WIRING METHODS

Chapter 39 Power and Lighting Distribution

Chapter 39 POWER AND LIGHTING DISTRIBUTION

Chapter 40 Devices and Luminaires

Chapter 40 DEVICES AND LUMINAIRES

Chapter 41 Appliance Installation

Chapter 41 APPLIANCE INSTALLATION

Chapter 42 Swimming Pools

Chapter 42 SWIMMING POOLS

Chapter 43 Class 2 Remote-Control, Signaling and Power-Limited Circuits

Chapter 43 CLASS 2 REMOTE-CONTROL, SIGNALING AND POWER-LIMITED CIRCUITS

Part IX ‒ Referenced Standards

Chapter 44 Referenced Standards

Chapter 45 HIGH WIND ZONES

Chapter 46 COASTAL AND FLOOD PLAIN CONSTRUCTION STANDARDS

Appendix A Sizing and Capacities of Gas Piping

Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods, Category I Appliances, and Appliances Listed for Use With Type B Vents

Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems

Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation

Appendix E Manufactured Housing Used as Dwellings

Appendix E (E-1 THROUGH E-4)
RESIDENTIAL REQUIREMENTS FOR ENERGY CONSERVATION

Appendix F Radon Control Methods

Appendix G Piping Standards for Various Applications

Appendix H Patio Covers

Appendix I Private Sewage Disposal

Appendix J Existing Buildings and Structures

Appendix J EXISTING BUILDINGS AND STRUCTURES

Appendix K Sound Transmission

Appendix L Permit Fees

Appendix M HOME DAY CARE—R-3 OCCUPANCY

Appendix M WOOD DECKS

Appendix N Venting Methods

Appendix O Automatic Vehicular Gates

Appendix O FOAM PLASTIC DIAGRAMS

Appendix P Sizing of Water Piping System

Appendix Q Reserved

Appendix Q DISCONTINUOUS FOOTINGS

Appendix R Light Straw-Clay Construction

Appendix S Strawbale Construction

Appendix T Recommended Procedure for Worst-Case Testing of Atmospheric Venting Systems Under N1102.4 or N1105 Conditions ≤ 5ACH50

Appendix U SOLAR-READY PROVISIONS—DETACHED ONE- AND TWO-FAMILY DWELLINGS, MULTIPLE SINGLE- FAMILY DWELLINGS (TOWNHOUSES)

Appendix V SWIMMING POOLS, SPAS AND HOT TUBS

Appendix W BASIC LOAD ESTIMATING

N1101.1 Scope

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
This chapter regulates the energy efficiency for the design and construction of buildings regulated by this code.

Note: The text of the following Sections N1101.2 through N1105 is extracted from the 20152018 edition of the InternationalNorth Carolina Energy Conservation Code—Residential Provisions and has been editorially revised to conform to the scope and application of this code. The section numbers appearing in parenthesis after each section number are the section numbers of the corresponding text in the InternationalNorth Carolina Energy Conservation Code—Residential Provisions.
This chapter shall regulate the design and construction of buildings for the effective use and conservation of energy over the useful life of each building. This chapter is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve this objective. This chapter is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.
The building official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.

N1101.4 (R102.1.1) Above Code Programs

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The building official or other authority having jurisdiction shall be permitted to deem a national, state or local energy-efficiency program to exceed the energy efficiency required by this code. Buildings approved in writing by such an energy-efficiency program shall be considered in compliance with this code. The requirements identified as "mandatory" in this chapter, as applicable, shall be met.

N1101.5 (R103.2) Information on Construction Documents

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the building official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, as applicable:

1. Insulation materials and their R-values.

2. Fenestration U-factors and SHGCs.

3. Area-weighted U-factor and SHGC calculations.

4. Mechanical system design criteria.

5. Mechanical and service water heating system and equipment types, sizes and efficiencies.

6. Equipment and system controls.

7. Duct sealing, duct and pipe insulation and location.

8. Air sealing details.

N1101.5.1 (R103.2.1) Thermal Envelope Depiction

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The building's thermal envelope shall be represented on the construction drawings.

N1101.6 (R202) Defined Terms

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
UpCodes note: See Chapter 2.
The following words and terms shall, for the purposes of this chapter, have the meanings shown herein.

ABOVE-GRADE WALL. A wall more than 50 percent above grade and enclosing conditioned space. This includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.

ACCESSIBLE. Admitting close approach as a result of not being guarded by locked doors, elevation or other effective means (see "Readily accessible").

ADDITION. An extension or increase in the conditioned space floor area or height of a building or structure.

AIR BARRIER. Material(s) assembled and joined together to provide a barrier to air leakage through the building envelope. An air barrier may be a single material or a combination of materials.

ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition that requires a permit. Also, a change in a building, electrical, gas, mechanical or plumbing system that involves an extension, addition or change to the arrangement, type or purpose of the original installation that requires a permit.

AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see "Manual").

BASEMENT WALL. A wall 50 percent or more below grade and enclosing conditioned space.

BUILDING. Any structure used or intended for supporting or sheltering any use or occupancy, including any mechanical systems, service water heating systems and electric power and lighting systems located on the building site and supporting the building.

BUILDING SITE. A continguous area of land that is under the ownership or control of one entity.

BUILDING THERMAL ENVELOPE. The basement walls, exterior walls, floor, roof and any other building elements that enclose conditioned space or provide a boundary between conditioned space and exempt or unconditioned space.

C-FACTOR (THERMAL CONDUCTANCE). The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h • ft2 • °F) [W/(m2 • K)].

CIRCULATING HOT WATER SYSTEM. A specifically designed water distribution system where one or more pumps are operated in the service hot water piping to circulate heated water from the water-heating equipment to fixtures and back to the water-heating equipment.

CLIMATE ZONE. A geographical region based on climatic criteria as specified in this code.

CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.

CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelope and that is directly heated or cooled or indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling.

CONTINUOUS AIR BARRIER. A combination of materials and assemblies that restrict or prevent the passage of air through the building thermal envelope.

CONTINUOUS INSULATION (ci). Insulating material that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior or exterior, or is integral to any opaque surface, of the building envelope.

CRAWL SPACE WALL. The opaque portion of a wall that encloses a crawl space and is partially or totally below grade.

CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.

DEMAND RECIRCULATION WATER SYSTEM. A water distribution system where pump(s) prime the service hot water piping with heated water upon demand for hot water.

DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.

DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.

ENERGY ANALYSIS. A method for estimating the annual energy use of the proposed design and standard reference design based on estimates of energy use.

ENERGY COST. The total estimated annual cost for purchased energy for the building functions regulated by this code, including applicable demand charges.

ENERGY SIMULATION TOOL. An approved software program or calculation-based methodology that projects the annual energy use of a building.

ERI REFERENCE DESIGN. A version of the rated design that meets the minimum requirements of the 2006 International Energy Conservation Code.

EXTERIOR WALL. Walls including both above-grade walls and basement walls.

FENESTRATION. Products classified as either vertical fenestration or skylights.

FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factory-formed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.

FENESTRATION, VERTICAL. Windows (fixed or moveable), opaque doors, glazed doors, glazed block and combination opaque/glazed doors composed of glass or other transparent or translucent glazing materials and installed at a slope of a least 60 degrees (1.05 rad) from horizontal.

HEATED SLAB. Slab-on-grade construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.

HIGH-EFFICACY LAMPS. Compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy of:

1. 60 lumens per watt for lamps over 40 watts;

2. 50 lumens per watt for lamps over 15 watts to 40 watts; and

3. 40 lumens per watt for lamps 15 watts or less.

HISTORIC BUILDING. Any building or structure that is one or more of the following:

1. Listed, or certified as eligible for lising by the State Historic Preservation Officer or the Keeper of the National Register of Historic Places, in the National Register of Historic Places.

2. Designated as historic under an applicable state or local law.

3. Certified as a contributing resource within a National Register-listed, state-designated or locally designated historic distsrict.

INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.

INSULATED SIDING. A type of continuous insulation with manufacturer-installed insulating material as an integral part of the cladding product having a minimum R-value of R-2.

INSULATING SHEATHING. An insulating board with a core material having a minimum R-value of R-2.

LOW-VOLTAGE LIGHTING. Lighting equipment powered through a transformer such as a cable conductor, a rail conductor and track lighting.

MANUAL. Capable of being operated by personal intervention (see "Automatic").

PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use for determining compliance based on total building performance.

RATED DESIGN. A description of the proposed building used to determine the energy rating index.

READILY ACCESSIBLE. Capable of being reached quickly for operation, renewal or inspection without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders or access equipment (see "Accessible").

REPAIR. The reconstruction or renewal of any part of an existing building for the purpose of its maintenance or to correct damage. For definitions applicable in Chapter 11, see Section N1101.9.

REROOFING. The process of recovering or replacing an existing roof covering. See "Roof recover" and "Roof replacement."

RESIDENTIAL BUILDING. For this chapter, includes detached one- and two-family dwellings and multiple single-family dwellings (townhouses) as well as Group R-2, R-3 and R-4 buildings three stories or less in height above grade plane.

ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering.

ROOF REPAIR. Reconstruction or renewal of any part of an existing roof for the purposes of its maintenance.

ROOF REPLACEMENT. The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.

R-VALUE (THERMAL RESISTANCE). The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h • ft2 • °F/Btu) [(m2 • K)/W].

SERVICE WATER HEATING. Supply of hot water for purposes other than comfort heating.

SKYLIGHT. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (1.05 rad) from horizontal. Glazing material in skylights, including unit skylights, solariums, sunrooms, roofs and sloped walls is included in this definition.

SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation that is then reradiated, conducted or convected into the space.

STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement for compliance based on total building performance.

SUNROOM. A one-story structure attached to a dwelling with a glazing area in excess of 40 percent of the gross area of the structure's exterior walls and roof.

THERMAL ISOLATION. Physical and space conditioning separation from conditioned space(s). The conditioned space(s) shall be controlled as separate zones for heating and cooling or conditioned by separate equipment.

THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.

U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h • ft2 • °F) [W/(m2 • K)].

VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.

VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, Visible Transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1.

WHOLE HOUSE MECHANICAL VENTILATION SYSTEM. An exhaust system, supply system, or combination thereof that is designed to mechanically exchange indoor air with outdoor air when operating continuously or through a programmed intermittent schedule to satisfy the whole house ventilation rates.

ZONE. A space or group of spaces within a building with heating or cooling requirements that are sufficiently similar so that desired conditions can be maintained throughout using a single controlling device.

N1101.7 (R301.1) Climate Zones

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Climate zones from Figure N1101.7 or Table N1101.7 shall be used in determining the applicable requirements in Sections N1101 through N1111. Locations not in Table N1101.7 (outside the United States) shall be assigned a climate zone based on Section N1101.7.2.



FIGURE N1101.7 (R301.1) CLIMATE ZONES


Warm and humid counties are below the dashed line.
FIGURE N1101.7 (R301.1)
CLIMATE ZONES
TABLE N1101.7 (R301.1) CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

Key: A – Moist, B – Dry, C – Marine. Absence of moisture designation indicates moisture regime is irrelevant.
Asterisk (*) indicates a warm-humid location.


US STATES

ALABAMA 3A Lee 7 Kodiak Island 4A Boone 3A Mississippi
3A Limestone 7 Lake and
Peninsula
3A Bradley 3A Monroe
3A Autauga* 3A Lowndes* 3A Calhoun 3A Montgomery
2A Baldwin* 3A Macon* 7 Matanuska-
Susitna
4A Carroll 3A Nevada
3A Barbour* 3A Madison 3A Chicot 4A Newton
3A Bibb 3A Marengo* 8 Nome 3A Clark 3A Ouachita
3A Blount 3A Marion 8 North Slope 3A Clay 3A Perry
3A Bullock* 3A Marshall 8 Northwest Arctic 3A Cleburne 3A Phillips
3A Butler* 2A Mobile* 7 Prince of Wales
Outer Ketchikan
3A Cleveland 3A Pike
3A Calhoun 3A Monroe* 3A Columbia* 3A Poinsett
3A Chambers 3A Montgomery* 7 Sitka 3A Conway 3A Polk
3A Cherokee 3A Morgan 7 Skagway-Hoonah-
Angoon
3A Craighead 3A Pope
3A Chilton 3A Perry* 3A Crawford 3A Prairie
3A Choctaw* 3A Pickens 8 Southeast
Fairbanks
3A Crittenden 3A Pulaski
3A Clarke* 3A Pike* 3A Cross 3A Randolph
3A Clay 3A Randolph 7 Valdez-Cordova 3A Dallas 3A Saline
3A Cleburne 3A Russell* 8 Wade Hampton 3A Desha 3A Scott
3A Coffee* 3A Shelby 7 Wrangell
Petersburg
3A Drew 4A Searcy
3A Colbert 3A St. Clair 3A Faulkner 3A Sebastian
3A Conecuh* 3A Sumter 7 Yakutat 3A Franklin 3A Sevier*
3A Coosa 3A Talladega 8 Yukon-Koyukuk 4A Fulton 3A Sharp
3A Covington* 3A Tallapoosa ARIZONA 3A Garland 3A St. Francis
3A Crenshaw* 3A Tuscaloosa 3A Grant 4A Stone
3A Cullman 3A Walker 5B Apache 3A Greene 3A Union*
3A Dale* 3A Washington* 3B Cochise 3A Hempstead* 3A Van Buren
3A Dallas* 3A Wilcox* 5B Coconino 3A Hot Spring 4A Washington
3A DeKalb 3A Winston 4B Gila 3A Howard 3A White
3A Elmore* ALASKA 3B Graham 3A Independence 3A Woodruff
3A Escambia* 3B Greenlee 4A Izard 3A Yell
3A Etowah 7 Aleutians East 2B La Paz 3A Jackson CALIFORNIA
3A Fayette 7 Aleutians West 2B Maricopa 3A Jefferson
3A Franklin 7 Anchorage 3B Mohave 3A Johnson 3C Alameda
3A Geneva* 8 Bethel 5B Navajo 3A Lafayette* 6B Alpine
3A Greene 7 Bristol Bay 2B Pima 3A Lawrence 4B Amador
3A Hale 7 Denali 2B Pinal 3A Lee 3B Butte
3A Henry* 8 Dillingham 3B Santa Cruz 3A Lincoln 4B Calaveras
3A Houston* 8 Fairbanks North
Star
4B Yavapai 3A Little River* 3B Colusa
3A Jackson 2B Yuma 3A Logan 3B Contra Costa
3A Jefferson 7 Haines ARKANSAS 3A Lonoke 4C Del Norte
3A Lamar 7 Juneau 4A Madison 4B El Dorado
3A Lauderdale 7 Kenai Peninsula 3A Arkansas 4A Marion 3B Fresno
3A Lawrence 7 Ketchikan
Gateway
3A Ashley 3A Miller* 3B Glenn
4A Baxter
4A Benton


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

4C Humboldt 3B Yuba 5B Morgan 2A Flagler* 2A Union*
2B Imperial COLORADO 4B Otero 2A Franklin* 2A Volusia*
4B Inyo 6B Ouray 2A Gadsden* 2A Wakulla*
3B Kern 5B Adams 7 Park 2A Gilchrist* 2A Walton*
3B Kings 6B Alamosa 5B Phillips 2A Glades* 2A Washington*
4B Lake 5B Arapahoe 7 Pitkin 2A Gulf* GEORGIA
5B Lassen 6B Archuleta 5B Prowers 2A Hamilton*
3B Los Angeles 4B Baca 5B Pueblo 2A Hardee* 2A Appling*
3B Madera 5B Bent 6B Rio Blanco 2A Hendry* 2A Atkinson*
3C Marin 5B Boulder 7 Rio Grande 2A Hernando* 2A Bacon*
4B Mariposa 5B Broomfield 7 Routt 2A Highlands* 2A Baker*
3C Mendocino 6B Chaffee 6B Saguache 2A Hillsborough* 3A Baldwin
3B Merced 5B Cheyenne 7 San Juan 2A Holmes* 4A Banks
5B Modoc 7 Clear Creek 6B San Miguel 2A Indian River* 3A Barrow
6B Mono 6B Conejos 5B Sedgwick 2A Jackson* 3A Bartow
3C Monterey 6B Costilla 7 Summit 2A Jefferson* 3A Ben Hill*
3C Napa 5B Crowley 5B Teller 2A Lafayette* 2A Berrien*
5B Nevada 6B Custer 5B Washington 2A Lake* 3A Bibb
3B Orange 5B Delta 5B Weld 2A Lee* 3A Bleckley*
3B Placer 5B Denver 5B Yuma 2A Leon* 2A Brantley*
5B Plumas 6B Dolores CONNECTICUT 2A Levy* 2A Brooks*
3B Riverside 5B Douglas 2A Liberty* 2A Bryan*
3B Sacramento 6B Eagle 5A (all) 2A Madison* 3A Bulloch*
3C San Benito 5B Elbert DELAWARE 2A Manatee* 3A Burke
3B San Bernardino 5B El Paso 2A Marion* 3A Butts
3B San Diego 5B Fremont 4A (all) 2A Martin* 3A Calhoun*
3C San Francisco 5B Garfield DISTRICT OF
COLUMBIA
1A Miami-Dade* 2A Camden*
3B San Joaquin 5B Gilpin 1A Monroe* 3A Candler*
3C San Luis Obispo 7 Grand 2A Nassau* 3A Carroll
3C San Mateo 7 Gunnison 4A (all) 2A Okaloosa* 4A Catoosa
3C Santa Barbara 7 Hinsdale FLORIDA 2A Okeechobee* 2A Charlton*
3C Santa Clara 5B Huerfano 2A Orange* 2A Chatham*
3C Santa Cruz 7 Jackson 2A Alachua* 2A Osceola* 3A Chattahoochee*
3B Shasta 5B Jefferson 2A Baker* 2A Palm Beach* 4A Chattooga
5B Sierra 5B Kiowa 2A Bay* 2A Pasco* 3A Cherokee
5B Siskiyou 5B Kit Carson 2A Bradford* 2A Pinellas* 3A Clarke
3B Solano 7 Lake 2A Brevard* 2A Polk* 3A Clay*
3C Sonoma 5B La Plata 1A Broward* 2A Putnam* 3A Clayton
3B Stanislaus 5B Larimer 2A Calhoun* 2A Santa Rosa* 2A Clinch*
3B Sutter 4B Las Animas 2A Charlotte* 2A Sarasota* 3A Cobb
3B Tehama 5B Lincoln 2A Citrus* 2A Seminole* 3A Coffee*
4B Trinity 5B Logan 2A Clay* 2A St. Johns* 2A Colquitt*
3B Tulare 5B Mesa 2A Collier* 2A St. Lucie* 3A Columbia
4B Tuolumne 7 Mineral 2A Columbia* 2A Sumter* 2A Cook*
3C Ventura 6B Moffat 2A DeSoto* 2A Suwannee* 3A Coweta
3B Yolo 5B Montezuma 2A Dixie* 2A Taylor*
5B Montrose 2A Duval*
2A Escambia*


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

3A Crawford 2A Lanier* 3A Taylor* 5B Cassia 4A Crawford
3A Crisp* 3A Laurens* 3A Telfair* 6B Clark 5A Cumberland
4A Dade 3A Lee* 3A Terrell* 5B Clearwater 5A DeKalb
4A Dawson 2A Liberty* 2A Thomas* 6B Custer 5A De Witt
2A Decatur* 3A Lincoln 3A Tift* 5B Elmore 5A Douglas
3A DeKalb 2A Long* 2A Toombs* 6B Franklin 5A DuPage
3A Dodge* 2A Lowndes* 4A Towns 6B Fremont 5A Edgar
3A Dooly* 4A Lumpkin 3A Treutlen* 5B Gem 4A Edwards
3A Dougherty* 3A Macon* 3A Troup 5B Gooding 4A Effingham
3A Douglas 3A Madison 3A Turner* 5B Idaho 4A Fayette
3A Early* 3A Marion* 3A Twiggs* 6B Jefferson 5A Ford
2A Echols* 3A McDuffie 4A Union 5B Jerome 4A Franklin
2A Effingham* 2A McIntosh* 3A Upson 5B Kootenai 5A Fulton
3A Elbert 3A Meriwether 4A Walker 5B Latah 4A Gallatin
3A Emanuel* 2A Miller* 3A Walton 6B Lemhi 5A Greene
2A Evans* 2A Mitchell* 2A Ware* 5B Lewis 5A Grundy
4A Fannin 3A Monroe 3A Warren 5B Lincoln 4A Hamilton
3A Fayette 3A Montgomery* 3A Washington 6B Madison 5A Hancock
4A Floyd 3A Morgan 2A Wayne* 5B Minidoka 4A Hardin
3A Forsyth 4A Murray 3A Webster* 5B Nez Perce 5A Henderson
4A Franklin 3A Muscogee 3A Wheeler* 6B Oneida 5A Henry
3A Fulton 3A Newton 4A White 5B Owyhee 5A Iroquois
4A Gilmer 3A Oconee 4A Whitfield 5B Payette 4A Jackson
3A Glascock 3A Oglethorpe 3A Wilcox* 5B Power 4A Jasper
2A Glynn* 3A Paulding 3A Wilkes 5B Shoshone 4A Jefferson
4A Gordon 3A Peach* 3A Wilkinson 6B Teton 5A Jersey
2A Grady* 4A Pickens 3A Worth* 5B Twin Falls 5A Jo Daviess
3A Greene 2A Pierce* HAWAII 6B Valley 4A Johnson
3A Gwinnett 3A Pike 5B Washington 5A Kane
4A Habersham 3A Polk 1A (all)* ILLINOIS 5A Kankakee
4A Hall 3A Pulaski* IDAHO 5A Kendall
3A Hancock 3A Putnam 5A Adams 5A Knox
3A Haralson 3A Quitman* 5B Ada 4A Alexander 5A Lake
3A Harris 4A Rabun 6B Adams 4A Bond 5A La Salle
3A Hart 3A Randolph* 6B Bannock 5A Boone 4A Lawrence
3A Heard 3A Richmond 6B Bear Lake 5A Brown 5A Lee
3A Henry 3A Rockdale 5B Benewah 5A Bureau 5A Livingston
3A Houston* 3A Schley* 6B Bingham 5A Calhoun 5A Logan
3A Irwin* 3A Screven* 6B Blaine 5A Carroll 5A Macon
3A Jackson 2A Seminole* 6B Boise 5A Cass 4A Macoupin
3A Jasper 3A Spalding 6B Bonner 5A Champaign 4A Madison
2A Jeff Davis* 4A Stephens 6B Bonneville 4A Christian 4A Marion
3A Jefferson 3A Stewart* 6B Boundary 5A Clark 5A Marshall
3A Jenkins* 3A Sumter* 6B Butte 4A Clay 5A Mason
3A Johnson* 3A Talbot 6B Camas 4A Clinton 4A Massac
3A Jones 3A Taliaferro 5B Canyon 5A Coles 5A McDonough
3A Lamar 2A Tattnall* 6B Caribou 5A Cook 5A McHenry


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A McLean 5A Boone 5A Miami 5A Appanoose 5A Jasper
5A Menard 4A Brown 4A Monroe 5A Audubon 5A Jefferson
5A Mercer 5A Carroll 5A Montgomery 5A Benton 5A Johnson
4A Monroe 5A Cass 5A Morgan 6A Black Hawk 5A Jones
4A Montgomery 4A Clark 5A Newton 5A Boone 5A Keokuk
5A Morgan 5A Clay 5A Noble 6A Bremer 6A Kossuth
5A Moultrie 5A Clinton 4A Ohio 6A Buchanan 5A Lee
5A Ogle 4A Crawford 4A Orange 6A Buena Vista 5A Linn
5A Peoria 4A Daviess 5A Owen 6A Butler 5A Louisa
4A Perry 4A Dearborn 5A Parke 6A Calhoun 5A Lucas
5A Piatt 5A Decatur 4A Perry 5A Carroll 6A Lyon
5A Pike 5A De Kalb 4A Pike 5A Cass 5A Madison
4A Pope 5A Delaware 5A Porter 5A Cedar 5A Mahaska
4A Pulaski 4A Dubois 4A Posey 6A Cerro Gordo 5A Marion
5A Putnam 5A Elkhart 5A Pulaski 6A Cherokee 5A Marshall
4A Randolph 5A Fayette 5A Putnam 6A Chickasaw 5A Mills
4A Richland 4A Floyd 5A Randolph 5A Clarke 6A Mitchell
5A Rock Island 5A Fountain 4A Ripley 6A Clay 5A Monona
4A Saline 5A Franklin 5A Rush 6A Clayton 5A Monroe
5A Sangamon 5A Fulton 4A Scott 5A Clinton 5A Montgomery
5A Schuyler 4A Gibson 5A Shelby 5A Crawford 5A Muscatine
5A Scott 5A Grant 4A Spencer 5A Dallas 6A O'Brien
4A Shelby 4A Greene 5A Starke 5A Davis 6A Osceola
5A Stark 5A Hamilton 5A Steuben 5A Decatur 5A Page
4A St. Clair 5A Hancock 5A St. Joseph 6A Delaware 6A Palo Alto
5A Stephenson 4A Harrison 4A Sullivan 5A Des Moines 6A Plymouth
5A Tazewell 5A Hendricks 4A Switzerland 6A Dickinson 6A Pocahontas
4A Union 5A Henry 5A Tippecanoe 5A Dubuque 5A Polk
5A Vermilion 5A Howard 5A Tipton 6A Emmet 5A Pottawattamie
4A Wabash 5A Huntington 5A Union 6A Fayette 5A Poweshiek
5A Warren 4A Jackson 4A Vanderburgh 6A Floyd 5A Ringgold
4A Washington 5A Jasper 5A Vermillion 6A Franklin 6A Sac
4A Wayne 5A Jay 5A Vigo 5A Fremont 5A Scott
4A White 4A Jefferson 5A Wabash 5A Greene 5A Shelby
5A Whiteside 4A Jennings 5A Warren 6A Grundy 6A Sioux
5A Will 5A Johnson 4A Warrick 5A Guthrie 5A Story
4A Williamson 4A Knox 4A Washington 6A Hamilton 5A Tama
5A Winnebago 5A Kosciusko 5A Wayne 6A Hancock 5A Taylor
5A Woodford 5A Lagrange 5A Wells 6A Hardin 5A Union
INDIANA 5A Lake 5A White 5A Harrison 5A Van Buren
5A La Porte 5A Whitley 5A Henry 5A Wapello
5A Adams 4A Lawrence IOWA 6A Howard 5A Warren
5A Allen 5A Madison 6A Humboldt 5A Washington
5A Bartholomew 5A Marion 5A Adair 6A Ida 5A Wayne
5A Benton 5A Marshall 5A Adams 5A Iowa 6A Webster
5A Blackford 4A Martin 6A Allamakee 5A Jackson 6A Winnebago


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

6A Winneshiek 4A Hodgeman 4A Seward 2A Iberville* 6A Cumberland
5A Woodbury 4A Jackson 4A Shawnee 3A Jackson* 6A Franklin
6A Worth 4A Jefferson 5A Sheridan 2A Jefferson* 6A Hancock
6A Wright 5A Jewell 5A Sherman 2A Jefferson Davis* 6A Kennebec
KANSAS 4A Johnson 5A Smith 2A Lafayette* 6A Knox
4A Kearny 4A Stafford 2A Lafourche* 6A Lincoln
4A Allen 4A Kingman 4A Stanton 3A La Salle* 6A Oxford
4A Anderson 4A Kiowa 4A Stevens 3A Lincoln* 6A Penobscot
4A Atchison 4A Labette 4A Sumner 2A Livingston* 6A Piscataquis
4A Barber 5A Lane 5A Thomas 3A Madison* 6A Sagadahoc
4A Barton 4A Leavenworth 5A Trego 3A Morehouse 6A Somerset
4A Bourbon 4A Lincoln 4A Wabaunsee 3A Natchitoches* 6A Waldo
4A Brown 4A Linn 5A Wallace 2A Orleans* 6A Washington
4A Butler 5A Logan 4A Washington 3A Ouachita* 6A York
4A Chase 4A Lyon 5A Wichita 2A Plaquemines* MARYLAND
4A Chautauqua 4A Marion 4A Wilson 2A Pointe Coupee*
4A Cherokee 4A Marshall 4A Woodson 2A Rapides* 4A Allegany
5A Cheyenne 4A McPherson 4A Wyandotte 3A Red River* 4A Anne Arundel
4A Clark 4A Meade KENTUCKY 3A Richland* 4A Baltimore
4A Clay 4A Miami 3A Sabine* 4A Baltimore (city)
5A Cloud 5A Mitchell 4A (all) 2A St. Bernard* 4A Calvert
4A Coffey 4A Montgomery LOUISIANA 2A St. Charles* 4A Caroline
4A Comanche 4A Morris 2A St. Helena* 4A Carroll
4A Cowley 4A Morton 2A Acadia* 2A St. James* 4A Cecil
4A Crawford 4A Nemaha 2A Allen* 2A St. John the
Baptist*
4A Charles
5A Decatur 4A Neosho 2A Ascension* 4A Dorchester
4A Dickinson 5A Ness 2A Assumption* 2A St. Landry* 4A Frederick
4A Doniphan 5A Norton 2A Avoyelles* 2A St. Martin* 5A Garrett
4A Douglas 4A Osage 2A Beauregard* 2A St. Mary* 4A Harford
4A Edwards 5A Osborne 3A Bienville* 2A St. Tammany* 4A Howard
4A Elk 4A Ottawa 3A Bossier* 2A Tangipahoa* 4A Kent
5A Ellis 4A Pawnee 3A Caddo* 3A Tensas* 4A Montgomery
4A Ellsworth 5A Phillips 2A Calcasieu* 2A Terrebonne* 4A Prince George's
4A Finney 4A Pottawatomie 3A Caldwell* 3A Union* 4A Queen Anne's
4A Ford 4A Pratt 2A Cameron* 2A Vermilion* 4A Somerset
4A Franklin 5A Rawlins 3A Catahoula* 3A Vernon* 4A St. Mary's
4A Geary 4A Reno 3A Claiborne* 2A Washington* 4A Talbot
5A Gove 5A Republic 3A Concordia* 3A Webster* 4A Washington
5A Graham 4A Rice 3A De Soto* 2A West Baton
Rouge*
4A Wicomico
4A Grant 4A Riley 2A East Baton
Rouge*
4A Worcester
4A Gray 5A Rooks 3A East Carroll 3A West Carroll MASSACHUSETTS
5A Greeley 4A Rush 2A East Feliciana* 2A West Feliciana*
4A Greenwood 4A Russell 2A Evangeline* 3A Winn* 5A (all)
5A Hamilton 4A Saline 3A Franklin* MAINE MICHIGAN
4A Harper 5A Scott 3A Grant*
4A Harvey 4A Sedgwick 2A Iberia* 6A Androscoggin 6A Alcona
4A Haskell 7 Aroostook 6A Alger


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A Allegan 7 Mackinac 6A Carver 7 Otter Tail 3A Clay
6A Alpena 5A Macomb 7 Cass 7 Pennington 3A Coahoma
6A Antrim 6A Manistee 6A Chippewa 7 Pine 3A Copiah*
6A Arenac 6A Marquette 6A Chisago 6A Pipestone 3A Covington*
7 Baraga 6A Mason 7 Clay 7 Polk 3A DeSoto
5A Barry 6A Mecosta 7 Clearwater 6A Pope 3A Forrest*
5A Bay 6A Menominee 7 Cook 6A Ramsey 3A Franklin*
6A Benzie 5A Midland 6A Cottonwood 7 Red Lake 3A George*
5A Berrien 6A Missaukee 7 Crow Wing 6A Redwood 3A Greene*
5A Branch 5A Monroe 6A Dakota 6A Renville 3A Grenada
5A Calhoun 5A Montcalm 6A Dodge 6A Rice 2A Hancock*
5A Cass 6A Montmorency 6A Douglas 6A Rock 2A Harrison*
6A Charlevoix 5A Muskegon 6A Faribault 7 Roseau 3A Hinds*
6A Cheboygan 6A Newaygo 6A Fillmore 6A Scott 3A Holmes
7 Chippewa 5A Oakland 6A Freeborn 6A Sherburne 3A Humphreys
6A Clare 6A Oceana 6A Goodhue 6A Sibley 3A Issaquena
5A Clinton 6A Ogemaw 7 Grant 6A Stearns 3A Itawamba
6A Crawford 7 Ontonagon 6A Hennepin 6A Steele 2A Jackson*
6A Delta 6A Osceola 6A Houston 6A Stevens 3A Jasper
6A Dickinson 6A Oscoda 7 Hubbard 7 St. Louis 3A Jefferson*
5A Eaton 6A Otsego 6A Isanti 6A Swift 3A Jefferson Davis*
6A Emmet 5A Ottawa 7 Itasca 6A Todd 3A Jones*
5A Genesee 6A Presque Isle 6A Jackson 6A Traverse 3A Kemper
6A Gladwin 6A Roscommon 7 Kanabec 6A Wabasha 3A Lafayette
7 Gogebic 5A Saginaw 6A Kandiyohi 7 Wadena 3A Lamar*
6A Grand Traverse 6A Sanilac 7 Kittson 6A Waseca 3A Lauderdale
5A Gratiot 7 Schoolcraft 7 Koochiching 6A Washington 3A Lawrence*
5A Hillsdale 5A Shiawassee 6A Lac qui Parle 6A Watonwan 3A Leake
7 Houghton 5A St. Clair 7 Lake 7 Wilkin 3A Lee
6A Huron 5A St. Joseph 7 Lake of the Woods 6A Winona 3A Leflore
5A Ingham 5A Tuscola 6A Le Sueur 6A Wright 3A Lincoln*
5A Ionia 5A Van Buren 6A Lincoln 6A Yellow Medicine 3A Lowndes
6A Iosco 5A Washtenaw 6A Lyon MISSISSIPPI 3A Madison
7 Iron 5A Wayne 7 Mahnomen 3A Marion*
6A Isabella 6A Wexford 7 Marshall 3A Adams* 3A Marshall
5A Jackson MINNESOTA 6A Martin 3A Alcorn 3A Monroe
5A Kalamazoo 6A McLeod 3A Amite* 3A Montgomery
6A Kalkaska 7 Aitkin 6A Meeker 3A Attala 3A Neshoba
5A Kent 6A Anoka 7 Mille Lacs 3A Benton 3A Newton
7 Keweenaw 7 Becker 6A Morrison 3A Bolivar 3A Noxubee
6A Lake 7 Beltrami 6A Mower 3A Calhoun 3A Oktibbeha
5A Lapeer 6A Benton 6A Murray 3A Carroll 3A Panola
6A Leelanau 6A Big Stone 6A Nicollet 3A Chickasaw 2A Pearl River*
5A Lenawee 6A Blue Earth 6A Nobles 3A Choctaw 3A Perry*
5A Livingston 6A Brown 7 Norman 3A Claiborne* 3A Pike*
7 Luce 7 Carlton 6A Olmsted 3A Clarke


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

3A Pontotoc 5A Chariton 4A Mississippi 4A Webster 4A Cumberland
3A Prentiss 4A Christian 4A Moniteau 5A Worth 4A Essex
3A Quitman 5A Clark 4A Monroe 4A Wright 4A Gloucester
3A Rankin* 4A Clay 4A Montgomery MONTANA 4A Hudson
3A Scott 5A Clinton 4A Morgan 5A Hunterdon
3A Sharkey 4A Cole 4A New Madrid 6B (all) 5A Mercer
3A Simpson* 4A Cooper 4A Newton NEBRASKA 4A Middlesex
3A Smith* 4A Crawford 5A Nodaway 4A Monmouth
2A Stone* 4A Dade 4A Oregon 5A (all) 5A Morris
3A Sunflower 4A Dallas 4A Osage NEVADA 4A Ocean
3A Tallahatchie 5A Daviess 4A Ozark 5A Passaic
3A Tate 5A DeKalb 4A Pemiscot 5B Carson City (city) 4A Salem
3A Tippah 4A Dent 4A Perry 5B Churchill 5A Somerset
3A Tishomingo 4A Douglas 4A Pettis 3B Clark 5A Sussex
3A Tunica 4A Dunklin 4A Phelps 5B Douglas 4A Union
3A Union 4A Franklin 5A Pike 5B Elko 5A Warren
3A Walthall* 4A Gasconade 4A Platte 5B Esmeralda NEW MEXICO
3A Warren* 5A Gentry 4A Polk 5B Eureka
3A Washington 4A Greene 4A Pulaski 5B Humboldt 4B Bernalillo
3A Wayne* 5A Grundy 5A Putnam 5B Lander 5B Catron
3A Webster 5A Harrison 5A Ralls 5B Lincoln 3B Chaves
3A Wilkinson* 4A Henry 4A Randolph 5B Lyon 4B Cibola
3A Winston 4A Hickory 4A Ray 5B Mineral 5B Colfax
3A Yalobusha 5A Holt 4A Reynolds 5B Nye 4B Curry
3A Yazoo 4A Howard 4A Ripley 5B Pershing 4B DeBaca
MISSOURI 4A Howell 4A Saline 5B Storey 3B Dona Ana
4A Iron 5A Schuyler 5B Washoe 3B Eddy
5A Adair 4A Jackson 5A Scotland 5B White Pine 4B Grant
5A Andrew 4A Jasper 4A Scott NEW
HAMPSHIRE
4B Guadalupe
5A Atchison 4A Jefferson 4A Shannon 5B Harding
4A Audrain 4A Johnson 5A Shelby 3B Hidalgo
4A Barry 5A Knox 4A St. Charles 6A Belknap 3B Lea
4A Barton 4A Laclede 4A St. Clair 6A Carroll 4B Lincoln
4A Bates 4A Lafayette 4A Ste. Genevieve 5A Cheshire 5B Los Alamos
4A Benton 4A Lawrence 4A St. Francois 6A Coos 3B Luna
4A Bollinger 5A Lewis 4A St. Louis 6A Grafton 5B McKinley
4A Boone 4A Lincoln 4A St. Louis (city) 5A Hillsborough 5B Mora
5A Buchanan 5A Linn 4A Stoddard 6A Merrimack 3B Otero
4A Butler 5A Livingston 4A Stone 5A Rockingham 4B Quay
5A Caldwell 5A Macon 5A Sullivan 5A Strafford 5B Rio Arriba
4A Callaway 4A Madison 4A Taney 6A Sullivan 4B Roosevelt
4A Camden 4A Maries 4A Texas NEW JERSEY 5B Sandoval
4A Cape Girardeau 5A Marion 4A Vernon 5B San Juan
4A Carroll 4A McDonald 4A Warren 4A Atlantic 5B San Miguel
4A Carter 5A Mercer 4A Washington 5A Bergen 5B Santa Fe
4A Cass 4A Miller 4A Wayne 4A Burlington 4B Sierra
4A Cedar 4A Camden 4B Socorro
4A Cape May


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5B Taos 4A Queens 4A Clay 4A Orange 7 Divide
5B Torrance 5A Rensselaer 4A Cleveland 3A Pamlico 6A Dunn
4B Union 4A Richmond 3A Columbus* 3A Pasquotank 7 Eddy
4B Valencia 5A Rockland 3A Craven 3A Pender* 6A Emmons
NEW YORK 5A Saratoga 3A Cumberland 3A Perquimans 7 Foster
5A Schenectady 3A Currituck 4A Person 6A Golden Valley
5A Albany 6A Schoharie 3A Dare 3A Pitt 7 Grand Forks
6A Allegany 6A Schuyler 3A Davidson 4A Polk 6A Grant
4A Bronx 5A Seneca 4A Davie 3A Randolph 7 Griggs
6A Broome 6A Steuben 3A Duplin 3A Richmond 6A Hettinger
6A Cattaraugus 6A St. Lawrence 4A Durham 3A Robeson 7 Kidder
5A Cayuga 4A Suffolk 3A Edgecombe 4A Rockingham 6A LaMoure
5A Chautauqua 6A Sullivan 4A Forsyth 3A Rowan 6A Logan
5A Chemung 5A Tioga 4A Franklin 4A Rutherford 7 McHenry
6A Chenango 6A Tompkins 3A Gaston 3A Sampson 6A McIntosh
6A Clinton 6A Ulster 4A Gates 3A Scotland 6A McKenzie
5A Columbia 6A Warren 4A Graham 3A Stanly 7 McLean
5A Cortland 5A Washington 4A Granville 4A Stokes 6A Mercer
6A Delaware 5A Wayne 3A Greene 4A Surry 6A Morton
5A Dutchess 4A Westchester 4A Guilford 4A Swain 7 Mountrail
5A Erie 6A Wyoming 4A Halifax 4A Transylvania 7 Nelson
6A Essex 5A Yates 4A Harnett 3A Tyrrell 6A Oliver
6A Franklin NORTH
CAROLINA
4A Haywood 3A Union 7 Pembina
6A Fulton 4A Henderson 4A Vance 7 Pierce
5A Genesee 4A Hertford 4A Wake 7 Ramsey
5A Greene 4A Alamance 3A Hoke 4A Warren 6A Ransom
6A Hamilton 4A Alexander 3A Hyde 3A Washington 7 Renville
6A Herkimer 5A Alleghany 4A Iredell 5A Watauga 6A Richland
6A Jefferson 3A Anson 4A Jackson 3A Wayne 7 Rolette
4A Kings 5A Ashe 3A Johnston 4A Wilkes 6A Sargent
6A Lewis 5A Avery 3A Jones 3A Wilson 7 Sheridan
5A Livingston 3A Beaufort 4A Lee 4A Yadkin 6A Sioux
6A Madison 4A Bertie 3A Lenoir 5A Yancey 6A Slope
5A Monroe 3A Bladen 4A Lincoln NORTH DAKOTA 6A Stark
6A Montgomery 3A Brunswick* 4A Macon 7 Steele
4A Nassau 4A Buncombe 4A Madison 6A Adams 7 Stutsman
4A New York 4A Burke 3A Martin 7 Barnes 7 Towner
5A Niagara 3A Cabarrus 4A McDowell 7 Benson 7 Traill
6A Oneida 4A Caldwell 3A Mecklenburg 6A Billings 7 Walsh
5A Onondaga 3A Camden 5A Mitchell 7 Bottineau 7 Ward
5A Ontario 3A Carteret* 3A Montgomery 6A Bowman 7 Wells
5A Orange 4A Caswell 3A Moore 7 Burke 7 Williams
5A Orleans 4A Catawba 4A Nash 6A Burleigh OHIO
5A Oswego 4A Chatham 3A New Hanover* 7 Cass
6A Otsego 4A Cherokee 4A Northampton 7 Cavalier 4A Adams
5A Putnam 3A Chowan 3A Onslow* 6A Dickey 5A Allen


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A Ashland 5A Mahoning 3A Bryan 3A Okfuskee 4C Linn
5A Ashtabula 5A Marion 3A Caddo 3A Oklahoma 5B Malheur
5A Athens 5A Medina 3A Canadian 3A Okmulgee 4C Marion
5A Auglaize 5A Meigs 3A Carter 3A Osage 5B Morrow
5A Belmont 5A Mercer 3A Cherokee 3A Ottawa 4C Multnomah
4A Brown 5A Miami 3A Choctaw 3A Pawnee 4C Polk
5A Butler 5A Monroe 4B Cimarron 3A Payne 5B Sherman
5A Carroll 5A Montgomery 3A Cleveland 3A Pittsburg 4C Tillamook
5A Champaign 5A Morgan 3A Coal 3A Pontotoc 5B Umatilla
5A Clark 5A Morrow 3A Comanche 3A Pottawatomie 5B Union
4A Clermont 5A Muskingum 3A Cotton 3A Pushmataha 5B Wallowa
5A Clinton 5A Noble 3A Craig 3A Roger Mills 5B Wasco
5A Columbiana 5A Ottawa 3A Creek 3A Rogers 4C Washington
5A Coshocton 5A Paulding 3A Custer 3A Seminole 5B Wheeler
5A Crawford 5A Perry 3A Delaware 3A Sequoyah 4C Yamhill
5A Cuyahoga 5A Pickaway 3A Dewey 3A Stephens PENNSYLVANIA
5A Darke 4A Pike 3A Ellis 4B Texas
5A Defiance 5A Portage 3A Garfield 3A Tillman 5A Adams
5A Delaware 5A Preble 3A Garvin 3A Tulsa 5A Allegheny
5A Erie 5A Putnam 3A Grady 3A Wagoner 5A Armstrong
5A Fairfield 5A Richland 3A Grant 3A Washington 5A Beaver
5A Fayette 5A Ross 3A Greer 3A Washita 5A Bedford
5A Franklin 5A Sandusky 3A Harmon 3A Woods 5A Berks
5A Fulton 4A Scioto 3A Harper 3A Woodward 5A Blair
4A Gallia 5A Seneca 3A Haskell OREGON 5A Bradford
5A Geauga 5A Shelby 3A Hughes 4A Bucks
5A Greene 5A Stark 3A Jackson 5B Baker 5A Butler
5A Guernsey 5A Summit 3A Jefferson 4C Benton 5A Cambria
4A Hamilton 5A Trumbull 3A Johnston 4C Clackamas 6A Cameron
5A Hancock 5A Tuscarawas 3A Kay 4C Clatsop 5A Carbon
5A Hardin 5A Union 3A Kingfisher 4C Columbia 5A Centre
5A Harrison 5A Van Wert 3A Kiowa 4C Coos 4A Chester
5A Henry 5A Vinton 3A Latimer 5B Crook 5A Clarion
5A Highland 5A Warren 3A Le Flore 4C Curry 6A Clearfield
5A Hocking 4A Washington 3A Lincoln 5B Deschutes 5A Clinton
5A Holmes 5A Wayne 3A Logan 4C Douglas 5A Columbia
5A Huron 5A Williams 3A Love 5B Gilliam 5A Crawford
5A Jackson 5A Wood 3A Major 5B Grant 5A Cumberland
5A Jefferson 5A Wyandot 3A Marshall 5B Harney 5A Dauphin
5A Knox OKLAHOMA 3A Mayes 5B Hood River 4A Delaware
5A Lake 3A McClain 4C Jackson 6A Elk
4A Lawrence 3A Adair 3A McCurtain 5B Jefferson 5A Erie
5A Licking 3A Alfalfa 3A McIntosh 4C Josephine 5A Fayette
5A Logan 3A Atoka 3A Murray 5B Klamath 5A Forest
5A Lorain 4B Beaver 3A Muskogee 5B Lake 5A Franklin
5A Lucas 3A Beckham 3A Noble 4C Lane 5A Fulton
5A Madison 3A Blaine 3A Nowata 4C Lincoln 5A Greene


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A Huntingdon 3A Bamberg* 5A Bennett 6A Minnehaha 4A Gibson
5A Indiana 3A Barnwell* 5A Bon Homme 6A Moody 4A Giles
5A Jefferson 3A Beaufort* 6A Brookings 6A Pennington 4A Grainger
5A Juniata 3A Berkeley* 6A Brown 6A Perkins 4A Greene
5A Lackawanna 3A Calhoun 6A Brule 6A Potter 4A Grundy
5A Lancaster 3A Charleston* 6A Buffalo 6A Roberts 4A Hamblen
5A Lawrence 3A Cherokee 6A Butte 6A Sanborn 4A Hamilton
5A Lebanon 3A Chester 6A Campbell 6A Shannon 4A Hancock
5A Lehigh 3A Chesterfield 5A Charles Mix 6A Spink 3A Hardeman
5A Luzerne 3A Clarendon 6A Clark 6A Stanley 3A Hardin
5A Lycoming 3A Colleton* 5A Clay 6A Sully 4A Hawkins
6A McKean 3A Darlington 6A Codington 5A Todd 3A Haywood
5A Mercer 3A Dillon 6A Corson 5A Tripp 3A Henderson
5A Mifflin 3A Dorchester* 6A Custer 6A Turner 4A Henry
5A Monroe 3A Edgefield 6A Davison 5A Union 4A Hickman
4A Montgomery 3A Fairfield 6A Day 6A Walworth 4A Houston
5A Montour 3A Florence 6A Deuel 5A Yankton 4A Humphreys
5A Northampton 3A Georgetown* 6A Dewey 6A Ziebach 4A Jackson
5A Northumberland 3A Greenville 5A Douglas TENNESSEE 4A Jefferson
5A Perry 3A Greenwood 6A Edmunds 4A Johnson
4A Philadelphia 3A Hampton* 6A Fall River 4A Anderson 4A Knox
5A Pike 3A Horry* 6A Faulk 4A Bedford 3A Lake
6A Potter 3A Jasper* 6A Grant 4A Benton 3A Lauderdale
5A Schuylkill 3A Kershaw 5A Gregory 4A Bledsoe 4A Lawrence
5A Snyder 3A Lancaster 6A Haakon 4A Blount 4A Lewis
5A Somerset 3A Laurens 6A Hamlin 4A Bradley 4A Lincoln
5A Sullivan 3A Lee 6A Hand 4A Campbell 4A Loudon
6A Susquehanna 3A Lexington 6A Hanson 4A Cannon 4A Macon
6A Tioga 3A Marion 6A Harding 4A Carroll 3A Madison
5A Union 3A Marlboro 6A Hughes 4A Carter 4A Marion
5A Venango 3A McCormick 5A Hutchinson 4A Cheatham 4A Marshall
5A Warren 3A Newberry 6A Hyde 3A Chester 4A Maury
5A Washington 3A Oconee 5A Jackson 4A Claiborne 4A McMinn
6A Wayne 3A Orangeburg 6A Jerauld 4A Clay 3A McNairy
5A Westmoreland 3A Pickens 6A Jones 4A Cocke 4A Meigs
5A Wyoming 3A Richland 6A Kingsbury 4A Coffee 4A Monroe
4A York 3A Saluda 6A Lake 3A Crockett 4A Montgomery
RHODE ISLAND 3A Spartanburg 6A Lawrence 4A Cumberland 4A Moore
3A Sumter 6A Lincoln 4A Davidson 4A Morgan
5A (all) 3A Union 6A Lyman 4A Decatur 4A Obion
SOUTH
CAROLINA
3A Williamsburg 6A Marshall 4A DeKalb 4A Overton
3A York 6A McCook 4A Dickson 4A Perry
SOUTH DAKOTA 6A McPherson 3A Dyer 4A Pickett
3A Abbeville 6A Meade 3A Fayette 4A Polk
3A Aiken 6A Aurora 5A Mellette 4A Fentress 4A Putnam
3A Allendale* 6A Beadle 6A Miner 4A Franklin 4A Rhea
3A Anderson


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

4A Roane 3B Brewster 3B Ector 3B Howard 3B McCulloch
4A Robertson 4B Briscoe 2B Edwards 3B Hudspeth 2A McLennan*
4A Rutherford 2A Brooks* 3A Ellis* 3A Hunt* 2A McMullen*
4A Scott 3A Brown* 3B El Paso 4B Hutchinson 2B Medina
4A Sequatchie 2A Burleson* 3A Erath* 3B Irion 3B Menard
4A Sevier 3A Burnet* 2A Falls* 3A Jack 3B Midland
3A Shelby 2A Caldwell* 3A Fannin 2A Jackson* 2A Milam*
4A Smith 2A Calhoun* 2A Fayette* 2A Jasper* 3A Mills*
4A Stewart 3B Callahan 3B Fisher 3B Jeff Davis 3B Mitchell
4A Sullivan 2A Cameron* 4B Floyd 2A Jefferson* 3A Montague
4A Sumner 3A Camp* 3B Foard 2A Jim Hogg* 2A Montgomery*
3A Tipton 4B Carson 2A Fort Bend* 2A Jim Wells* 4B Moore
4A Trousdale 3A Cass* 3A Franklin* 3A Johnson* 3A Morris*
4A Unicoi 4B Castro 2A Freestone* 3B Jones 3B Motley
4A Union 2A Chambers* 2B Frio 2A Karnes* 3A Nacogdoches*
4A Van Buren 2A Cherokee* 3B Gaines 3A Kaufman* 3A Navarro*
4A Warren 3B Childress 2A Galveston* 3A Kendall* 2A Newton*
4A Washington 3A Clay 3B Garza 2A Kenedy* 3B Nolan
4A Wayne 4B Cochran 3A Gillespie* 3B Kent 2A Nueces*
4A Weakley 3B Coke 3B Glasscock 3B Kerr 4B Ochiltree
4A White 3B Coleman 2A Goliad* 3B Kimble 4B Oldham
4A Williamson 3A Collin* 2A Gonzales* 3B King 2A Orange*
4A Wilson 3B Collingsworth 4B Gray 2B Kinney 3A Palo Pinto*
TEXAS 2A Colorado* 3A Grayson 2A Kleberg* 3A Panola*
2A Comal* 3A Gregg* 3B Knox 3A Parker*
2A Anderson* 3A Comanche* 2A Grimes* 3A Lamar* 4B Parmer
3B Andrews 3B Concho 2A Guadalupe* 4B Lamb 3B Pecos
2A Angelina* 3A Cooke 4B Hale 3A Lampasas* 2A Polk*
2A Aransas* 2A Coryell* 3B Hall 2B La Salle 4B Potter
3A Archer 3B Cottle 3A Hamilton* 2A Lavaca* 3B Presidio
4B Armstrong 3B Crane 4B Hansford 2A Lee* 3A Rains*
2A Atascosa* 3B Crockett 3B Hardeman 2A Leon* 4B Randall
2A Austin* 3B Crosby 2A Hardin* 2A Liberty* 3B Reagan
4B Bailey 3B Culberson 2A Harris* 2A Limestone* 2B Real
2B Bandera 4B Dallam 3A Harrison* 4B Lipscomb 3A Red River*
2A Bastrop* 3A Dallas* 4B Hartley 2A Live Oak* 3B Reeves
3B Baylor 3B Dawson 3B Haskell 3A Llano* 2A Refugio*
2A Bee* 4B Deaf Smith 2A Hays* 3B Loving 4B Roberts
2A Bell* 3A Delta 3B Hemphill 3B Lubbock 2A Robertson*
2A Bexar* 3A Denton* 3A Henderson* 3B Lynn 3A Rockwall*
3A Blanco* 2A DeWitt* 2A Hidalgo* 2A Madison* 3B Runnels
3B Borden 3B Dickens 2A Hill* 3A Marion* 3A Rusk*
2A Bosque* 2B Dimmit 4B Hockley 3B Martin 3A Sabine*
3A Bowie* 4B Donley 3A Hood* 3B Mason 3A San Augustine*
2A Brazoria* 2A Duval* 3A Hopkins* 2A Matagorda* 2A San Jacinto*
2A Brazos* 3A Eastland 2A Houston* 2B Maverick 2A San Patricio*


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

3A San Saba* 3A Young 4C Clark 4A Gilmer WISCONSIN
3B Schleicher 2B Zapata 5B Columbia 5A Grant
3B Scurry 2B Zavala 4C Cowlitz 5A Greenbrier 6A Adams
3B Shackelford UTAH 5B Douglas 5A Hampshire 7 Ashland
3A Shelby* 6B Ferry 5A Hancock 6A Barron
4B Sherman 5B Beaver 5B Franklin 5A Hardy 7 Bayfield
3A Smith* 6B Box Elder 5B Garfield 5A Harrison 6A Brown
3A Somervell* 6B Cache 5B Grant 4A Jackson 6A Buffalo
2A Starr* 6B Carbon 4C Grays Harbor 4A Jefferson 7 Burnett
3A Stephens 6B Daggett 4C Island 4A Kanawha 6A Calumet
3B Sterling 5B Davis 4C Jefferson 5A Lewis 6A Chippewa
3B Stonewall 6B Duchesne 4C King 4A Lincoln 6A Clark
3B Sutton 5B Emery 4C Kitsap 4A Logan 6A Columbia
4B Swisher 5B Garfield 5B Kittitas 5A Marion 6A Crawford
3A Tarrant* 5B Grand 5B Klickitat 5A Marshall 6A Dane
3B Taylor 5B Iron 4C Lewis 4A Mason 6A Dodge
3B Terrell 5B Juab 5B Lincoln 4A McDowell 6A Door
3B Terry 5B Kane 4C Mason 4A Mercer 7 Douglas
3B Throckmorton 5B Millard 6B Okanogan 5A Mineral 6A Dunn
3A Titus* 6B Morgan 4C Pacific 4A Mingo 6A Eau Claire
3B Tom Green 5B Piute 6B Pend Oreille 5A Monongalia 7 Florence
2A Travis* 6B Rich 4C Pierce 4A Monroe 6A Fond du Lac
2A Trinity* 5B Salt Lake 4C San Juan 4A Morgan 7 Forest
2A Tyler* 5B San Juan 4C Skagit 5A Nicholas 6A Grant
3A Upshur* 5B Sanpete 5B Skamania 5A Ohio 6A Green
3B Upton 5B Sevier 4C Snohomish 5A Pendleton 6A Green Lake
2B Uvalde 6B Summit 5B Spokane 4A Pleasants 6A Iowa
2B Val Verde 5B Tooele 6B Stevens 5A Pocahontas 7 Iron
3A Van Zandt* 6B Uintah 4C Thurston 5A Preston 6A Jackson
2A Victoria* 5B Utah 4C Wahkiakum 4A Putnam 6A Jefferson
2A Walker* 6B Wasatch 5B Walla Walla 5A Raleigh 6A Juneau
2A Waller* 3B Washington 4C Whatcom 5A Randolph 6A Kenosha
3B Ward 5B Wayne 5B Whitman 4A Ritchie 6A Kewaunee
2A Washington* 5B Weber 5B Yakima 4A Roane 6A La Crosse
2B Webb VERMONT WEST VIRGINIA 5A Summers 6A Lafayette
2A Wharton* 5A Taylor 7 Langlade
3B Wheeler 6A (all) 5A Barbour 5A Tucker 7 Lincoln
3A Wichita VIRGINIA 4A Berkeley 4A Tyler 6A Manitowoc
3B Wilbarger 4A Boone 5A Upshur 6A Marathon
2A Willacy* 4A (all) 4A Braxton 4A Wayne 6A Marinette
2A Williamson* WASHINGTON 5A Brooke 5A Webster 6A Marquette
2A Wilson* 4A Cabell 5A Wetzel 6A Menominee
3B Winkler 5B Adams 4A Calhoun 4A Wirt 6A Milwaukee
3A Wise 5B Asotin 4A Clay 4A Wood 6A Monroe
3A Wood* 5B Benton 5A Doddridge 4A Wyoming 6A Oconto
4B Yoakum 5B Chelan 5A Fayette 7 Oneida
4C Clallam 6A Outagamie


(continued)

TABLE N1101.7 (R301.1)—continued CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY

6A Ozaukee 7 Taylor 6B Big Horn 6B Sheridan NORTHERN
MARIANA
ISLANDS
6A Pepin 6A Trempealeau 6B Campbell 7 Sublette
6A Pierce 6A Vernon 6B Carbon 6B Sweetwater
6A Polk 7 Vilas 6B Converse 7 Teton
6A Portage 6A Walworth 6B Crook 6B Uinta 1A (all)*
7 Price 7 Washburn 6B Fremont 6B Washakie PUERTO RICO
6A Racine 6A Washington 5B Goshen 6B Weston
6A Richland 6A Waukesha 6B Hot Springs US TERRITORIES 1A (all)*
6A Rock 6A Waupaca 6B Johnson VIRGIN ISLANDS
6A Rusk 6A Waushara 6B Laramie AMERICAN
SAMOA
6A Sauk 6A Winnebago 7 Lincoln 1A (all)*
7 Sawyer 6A Wood 6B Natrona
6A Shawano WYOMING 6B Niobrara 1A (all)*
6A Sheboygan 6B Park GUAM
6A St. Croix 6B Albany 5B Platte
1A (all)*
TABLE N1101.7 (R301.1)
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORY
Key: A ‒ Moist.
Asterisk (*) indicates a warm-humid location.
BY COUNTY
NORTH CAROLINA
4A Alamance
4A Alexander
5A Alleghany
3A Anson
5A Ashe
5A Avery
3A Beaufort
4A Bertie
3A Bladen
3A Brunswick*
4A Buncombe
4A Burke
3A Cabarrus
4A Caldwell
3A Camden
3A Carteret*
4A Caswell
4A Catawba
4A Chatham
4A Cherokee
3A Chowan
4A Clay
4A Cleveland
3A Columbus*
3A Craven
3A Cumberland
3A Currituck
3A Dare
3A Davidson
4A Davie
3A Duplin
4A Durham
3A Edgecombe
4A Forsyth
4A Franklin
3A Gaston
4A Gates
4A Graham
4A Granville
3A Greene
4A Guilford
4A Halifax
4A Harnett
4A Haywood
4A Henderson
4A Hertford
3A Hoke
3A Hyde
4A Iredell
4A Jackson
3A Johnston
3A Jones
4A Lee
3A Lenoir
4A Lincoln
4A Macon
4A Madison
3A Martin
4A McDowell
3A Mecklenburg
5A Mitchell
3A Montgomery
3A Moore
4A Nash
3A New Hanover*
4A Northampton
3A Onslow*
4A Orange
3A Pamlico
3A Pasquotank
3A Pender*
3A Perquimans
4A Person
3A Pitt
4A Polk
3A Randolph
3A Richmond
3A Robeson
4A Rockingham
3A Rowan
4A Rutherford
3A Sampson
3A Scotland
3A Stanly
4A Stokes
4A Surry
4A Swain
4A Transylvania
3A Tyrrell
3A Union
4A Vance
4A Wake
4A Warren
3A Washington
5A Watauga
3A Wayne
4A Wilkes
3A Wilson
4A Yadkin
5A Yancey
Warm humid counties are identified in Table N1101.7 by an asterisk.

N1101.7.2 (R301.3) International Climate Zones

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The climate zone for any location outside the United States shall be determined by applying Table N1101.7.2(1) and then Table N1101.7.2(2).

TABLE N1101.7.2(1) [R302.3(1)] INTERNATIONAL CLIMATE ZONE DEFINITIONS

MAJOR CLIMATE TYPE DEFINITIONS
Marine (C) Definition—Locations meeting all four criteria:
1. Mean temperature of coldest month between -3°C (27°F) and 18°C (65°F).
2. Warmest month mean < 22°C (72°F).
3. At least four months with mean temperatures over 10°C (50°F).
4. Dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the
month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and
April through September in the Southern Hemisphere.
Dry (B) Definition—Locations meeting the following criteria:
Not marine and Pin < 0.44 × (TF - 19.5) [Pcm < 2.0 × (TC + 7) in SI units]
where:
Pin = Annual precipitation in inches (cm)
T = Annual mean temperature in °F (°C)
Moist (A) Definition—Locations that are not marine and not dry.
Warm-humid Definition—Moist (A) locations where either of the following wet-bulb temperature conditions shall occur during the warmest
six consecutive months of the year:
1. 67°F (19.4°C) or higher for 3,000 or more hours; or
2. 73°F (22.8°C) or higher for 1,500 or more hours.

For SI: °C = [(°F)-32]/1.8, 1 inch = 2.54 cm.


TABLE N1101.7.2(2) [R301.3(2)] INTERNATIONAL CLIMATE ZONE DEFINITIONS

ZONE
NUMBER
THERMAL CRITERIA
IP Units SI Units
1 9000 < CDD50°F 5000 < CDD10°C
2 6300 < CDD50°F ≤ 9000 3500 < CDD10°C ≤ 5000
3A and 3B 4500 < CDD50°F ≤ 6300 AND HDD65°F ≤ 5400 2500 < CDD10°C ≤ 3500 AND HDD18°C ≤ 3000
4A and 4B CDD50°F ≤ 4500 AND HDD65°F ≤ 5400 CDD10°C ≤ 2500 AND HDD18°C ≤ 3000
3C HDD65°F ≤ 3600 HDD18°C ≤ 2000
4C 3600 < HDD65°F ≤ 5400 2000 < HDD18°C ≤ 3000
5 5400 < HDD65°F ≤ 7200 3000 < HDD18°C ≤ 4000
6 7200 < HDD65°F ≤ 9000 4000 < HDD18°C ≤ 5000
7 9000 < HDD65°F ≤ 12600 5000 < HDD18°C ≤ 7000
8 12600 < HDD65°F 7000 < HDD18°C

For SI: °C = [(°F)-32]/1.8.

N1101.8 (R301.4) Tropical Climate Zone

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The tropical climate zone shall be defined as:

1. Hawaii, Puerto Rico, Guam, American Samoa, US Virgin Islands, Commonwealth of Northern Mariana Islands; and

2. Islands in the area between the Tropic of Cancer and the Tropic of Capricorn.
The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.
Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.
An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For insulated siding, the R-value shall be labeled on the product's package and shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.
The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers not less than 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.
Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable upon inspection.

N1101.10.3 (R303.1.3) Fenestration Product Rating

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100.

Exception: Where required, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.

U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled U-factor shall be assigned a default U-factor from Tables N1101.10.3(1) or N1101.10.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table N1101.10.3(3).

Exception: When a garage door is a part of the building thermal envelope, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.

TABLE N1101.10.3(1) [R303.1.3(1)]
DEFAULT GLAZED FENESTRATION U-FACTORS
FRAME TYPE SINGLE
PANE
DOUBLE
PANE
SKYLIGHT
Single Double
Metal 1.20 0.80 2.00 1.30
Metal with Thermal Break 1.10 0.65 1.90 1.10
Nonmetal or Metal Clad 0.95 0.55 1.75 1.05
Glazed Block 0.60


TABLE N1101.10.3(2) [R303.1.3(2)]
DEFAULT DOOR U-FACTORS
DOOR TYPE U-FACTOR
Uninsulated Metal 1.20
Insulated Metal 0.60
Wood 0.50
Insulated, nonmetal edge, max 45% glazing,
any glazing double pane
0.35


TABLE N1101.10.3(3) [R303.1.3(3)]
DEFAULT GLAZED FENESTRATION SHGC AND VT
SINGLE GLAZED DOUBLE GLAZED GLAZED
BLOCK
Clear Tinted Clear Tinted
SHGC 0.8 0.7 0.7 0.6 0.6
VT 0.6 0.3 0.6 0.3 0.6
The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (CFR Title 16, Part 460) in units of h × ft2 × °F/Btu at a mean temperature of 75°F (24°C).
The thermal resistance (R-value) of insulated siding shall be determined in accordance with ASTM C 1363. Installation for testing shall be in accordance with the manufacturer's installation instructions.
All materials, systems and equipment shall be installed in accordance with the manufacturer's instructions and this code.

N1101.11.1 (R303.2.1) Protection of Exposed Foundation Insulation

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have an rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation's thermal performance. The protective covering shall cover the exposed exterior insulation and extend not less than 6 inches (153 mm) below grade.

N1101.12 (R303.3) Maintenance Information

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Maintenance instructions shall be furnished for equipment and systems that require preventive maintenance. Required regular maintenance actions shall be clearly stated and incorporated on a readily accessible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.

N1101.13 (R401.2) Compliance

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Projects shall comply with one of the following:
  1. Sections N1101.14 through N1104.
  2. Section N1105 and the provisions of Sections N1101.14 through N1104 labeled "Mandatory."
  3. An energy rating index (ERI) approach in Section N1106.
  4. North Carolina specific REScheck™ shall be permitted to demonstrate compliance with this code. Envelope requirements may not be traded off against the use of high efficiency heating or cooling equipment. No trade-off calculations are needed for required termite inspection and treatment gaps.

N1101.13.1 (R401.2.1) Tropical Zone

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Residential buildings in the tropical zone at elevations below 2,400 feet (731.5 m) above sea level shall be deemed to comply with this chapter where the following conditions are met:
  1. Not more than one-half of the occupied space is air conditioned.
  2. The occupied space is not heated.
  3. Solar, wind or other renewable energy source supplies not less than 80 percent of the energy for service water heating.
  4. Glazing in conditioned space has a solar heat gain coefficient of less than or equal to 0.40, or has an overhang with a projection factor equal to or greater than 0.30.
  5. Permanently installed lighting is in accordance with Section N1104.
  6. The exterior roof surface complies with one of the options in Table C402.3 of the International Energy Conservation Code, or the roof/ceiling has insulation with an R-value of R-15 or greater. If present, attics above the insulation are vented and attics below the insulation are unvented.
  7. Roof surfaces have a minimum slope of 1/4 inch (6.4 mm) per foot of run. The finished roof does not have water accumulation areas.
  8. Operable fenestration provides ventilation area equal to not less than 14 percent of the floor area in each room. Alternatively, equivalent ventilation is provided by a ventilation fan.
  9. Bedrooms with exterior walls facing two different directions have operable fenestration on exterior walls facing two directions.
  10. Interior doors to bedrooms are capable of being secured in the open position.
  11. A ceiling fan or ceiling fan rough-in is provided for bedrooms and the largest space that is not used as a bedroom.

N1101.14 (R401.3) Certificate (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
A permanent certificate shall be completed by the builder or registered design professional and posted on a wall in the space where the furnace is located, a utility room or an approved location inside the building. Where located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label or other required labels. The certificate shall list the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawl space wall and/or floor) and ducts outside conditioned spaces; U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration, and the results from any required duct system and building envelope air leakage testing done on the building. Where there is more than one value for each component, the certificate shall list the value covering the largest area. The certificate shall list the types and efficiencies of heating, cooling and service water heating equipment. Where a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, the certificate shall list "gas-fired unvented room heater," "electric furnace" or "baseboard electric heater," as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces or electric baseboard heaters. A permanent certificate shall be posted on or in the electrical distribution panel, in the attic next to the attic insulation card, or inside a kitchen cabinet or other approved location. The certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label or other required labels. The builder, permit holder, or registered design professional shall be responsible for completing the certificate. The certificate shall list the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawlspace wall and floor) and ducts outside conditioned spaces; and the U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration. Where there is more than one value for each component, the certificate shall list the value covering the largest area. The certificate shall indicate whether the building air leakage was visually inspected as required in Section N1102.4.2.1 or provide results of the air leakage testing required in Section N1102.4.2.2. The certificate shall provide results of the duct leakage test required in Section N1103.3.3. Appendix E-1 contains a sample certificate.

N1101.15 (R401.4) Additional Voluntary Criteria for Increasing Residential Energy Efficiency

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Appendix E-4 contains additional voluntary measures for increasing residential energy efficiency beyond code minimums. Implementation of the increased energy efficiency measures is strictly voluntary at the option of the permit holder. The sole purpose of the appendix is to provide guidance for achieving additional residential energy efficiency improvements that have been evaluated to be those that are most cost effective for achieving an additional 10-15 percent improvement in energy efficiency beyond code minimums.
The building thermal envelope shall meet the requirements of Sections N1102.1.1 through N1102.1.5.

Exception: The following low energy buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this section shall be exempt from the building thermal envelope provisions of Section N1102.
  1. Those with a peak design rate of energy usage less than 3.4 Btu/h • ft2 (10.7 W/m2) or 1.0 watt/ft2 of floor area for space conditioning purposes.
  2. Those that do not contain conditioned space.

N1102.1.1 (R402.1.1) Vapor Retarder

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Wall assemblies in the building thermal envelope shall comply with the vapor retarder requirements of Section R702.7.

N1102.1.2 (R402.1.2) Insulation and Fenestration Criteria

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The building thermal envelope shall meet the requirements of Table N1102.1.2 based on the climate zone specified in Section N1101.7.

TABLE N1102.1.2 (R402.1.2)
INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa
CLIMATE
ZONE
FENESTRATION
U-FACTORb, j
SKYLIGHTb
U-FACTOR
GLAZED
FENESTRATION
SHGCb, ek
CEILING
R-VALUEm
WOOD
FRAME WALL
R-VALUE
MASS
WALL
R-VALUEi
FLOOR
R-VALUE
BASEMENTc, o
WALL
R-VALUE
SLABd
R-VALUE
& DEPTH
CRAWL
SPACEc

WALL
R-VALUE
1 NR 0.75 0.25 30 13 3/4 13 0 0 0
2 0.40 0.65 0.25 38 13 4/6 13 0 0 0
3 0.35 0.55 0.250.30 38 or 30ci 2015 or 13 + 52.5h 85/13 or 5/10ci 19 5/13f 0 5/13
4 except
Marine
0.35 0.55 0.400.30 49 38 or 30ci 2015 or 13 + 52.5h 85/13 or 5/10ci 19 10/1315 10, 2 ft 10/1315
5 and
Marine 4
0.320.35 0.55 NR 4938 or 30ci 2019n or 13 + 5h or 15+3h 13/17or 13/12.5 ci 30g 15/1910/15 10, 2 ft 1510/19
6 0.32 0.55 NR 49 20 + 5 or 13 + 10h 15/20 30g 15/19 10, 4 ft 15/19
7 and 8 0.32 0.55 NR 49 20 + 5 or 13 + 10h 19/21 38g 15/19 10, 4 ft 15/19
For SI: 1 foot = 304.8 mm.
  1. R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed R-value of the insulation shall not be less than the R-value specified in the table.
  2. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.

    Exception: Skylights may be excluded from glazed fenestration SHGC requirements in Climate Zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.
  3. "15/19" means R-15 continuous insulation on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. "15/19" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the home. "10/13" means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. “10/15” means R-10 continuous insulated sheathing on the interior or exterior of the home or R-15 cavity insulation at the interior of the basement wall or crawl space wall.
  4. R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1 through 3 for heated slabs. For monolithic slabs, insulation shall be applied from the inspection gap downward to the bottom of the footing or a maximum of 24 inches below grade, whichever is less. For floating slabs, insulation shall extend to the bottom of the foundation wall or 24 inches, whichever is less. (See Appendix O).
  5. There are no SHGC requirements in the Marine ZoneDeleted.
  6. Basement wall insulation is not required in warm-humid locations as defined by Figure N1101.10N1101.7 and Table N1101.10N1101.7.
  7. Or insulation sufficient to fill the framing cavity, R-19 minimum.
  8. The first value is cavity insulation, the second value is continuous insulation, so "13+5" means R-13 cavity insulation plus R-5 continuous insulation. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2.
  9. The second R-value applies when more than half the insulation is on the interior of the mass wall.
  10. In addition to the exemption in Section N1102.3.3, a maximum of two glazed fenestration product assemblies having a U-factor no greater than 0.55 shall be permitted to be substituted for minimum code compliant fenestration product assemblies without penalty.
  11. In addition to the exemption in Section N112.3.3, a maximum of two glazed fenestration product assemblies having a SHGC no greater than 0.70 shall be permitted to be substituted for minimum code compliant fenestration product assemblies without penalty.
  12. R-30 shall be deemed to satisfy the ceiling insulation requirement wherever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves. Otherwise R-38 insulation is required where adequate clearance exists or insulation must extend to either the insulation baffle or within 1 inch of the attic roof deck.
  13. Table value required except for roof edge where the space is limited by the pitch of the roof; there the insulation must fill the space up to the air baffle.
  14. R-19 fiberglass batts compressed and installed in a nominal 2 × 6 framing cavity is deemed to comply. Fiberglass batts rated R-19 or higher compressed and installed in a 2 × 4 wall is not deemed to comply.
  15. Basement wall meeting the minimum mass wall specific heat content requirement may use the mass wall R-value as the minimum requirement.
Insulation material used in layers, such as framing cavity insulation, or continuous insulation shall be summed to compute the corresponding component R-value. The manufacturer's settled R-value shall be used for blown insulation. Computed R-values shall not include an R-value for other building materials or air films. Where insulated siding is used for the purpose of complying with the continuous insulation requirements of Table N1102.1.2, the manufacturer's labeled R-value for insulated siding shall be reduced by R-0.6.

N1102.1.4 (R402.1.4) U-factor alternative

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
An assembly with a U-factor equal to or less than that specified in Table N1102.1.4 shall be permitted as an alternative to the R-value in Table N1102.1.2.

TABLE N1102.1.4 (R402.1.4)
EQUIVALENT U-FACTORSa
CLIMATE
ZONE
FENESTRATION
U-FACTORd
SKYLIGHT
U-FACTOR
CEILING
U-FACTOR
FRAME
WALL
U-FACTOR
MASS WALL
U-FACTORb
FLOOR
U-FACTOR
BASEMENT
WALL
U-FACTOR
CRAWL
SPACE WALL
U-FACTOR
1 0.50 0.75 0.035 0.084 0.197 0.064 0.360 0.477
2 0.40 0.65 0.030 0.084 0.165 0.064 0.360 0.477
3 0.35 0.55 0.030 0.0600.077 0.0980.141 0.047 0.091c 0.136
4 except Marine 0.35 0.55 0.0260.030 0.0600.077 0.0980.141 0.047 0.059 0.065
5 and Marine 4 0.320.35 0.55 0.0260.030 0.0600.061 0.082 0.033 0.0500.059 0.0550.065
6 0.32 0.55 0.026 0.045 0.060 0.033 0.050 0.055
7 and 8 0.32 0.55 0.026 0.045 0.057 0.028 0.050 0.055
  1. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.
  2. When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.17 in Zone 1, 0.14 in Zone 2, 0.12 in Zone 3, 0.087 in Zone 4 except Marine, 0.065 in Zone 5 and Marine 4, and 0.057 in Zones 6 through 80.07 in Climate Zone 3, 0.07 in Climate Zone 4 and 0.054 in Climate Zone 5.
  3. Basement wall U-factor of 0.360 in warm-humid locations as defined by Figure N1101.7 (R301.1) and Table N1101.7 (R301.1).
  4. A maximum of two glazed fenestration product assemblies having a U-factor no greater than 0.55 and a SHGC no greater than 0.70 shall be permitted to be substituted for minimum code compliant fenestration product assemblies without penalty. When applying this note and using the REScheck “UA Trade-off” compliance method to allow continued use of the software, the applicable fenestration products shall be modeled as meeting the U-factor of 0.35 and the SHGC of 0.30, as applicable, but the fenestration products actual U-factor and actual SHGC shall be noted in the comments section of the software for documentation of application of this note to the applicable products. Compliance for these substitute products shall be verified compared to the allowed substituted maximum U-value requirement and maximum SHGC requirement, as applicable.
If the total building thermal envelope UA (sum of U-factor times assembly area) is less than or equal to the total UA resulting from using the U-factors in Table N1102.1.4 (multiplied by the same assembly area as in the proposed building), the building shall be considered in compliance with Table N1102.1.2. The UA calculation shall be done using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. The SHGC requirements shall be met in addition to UA compliance.

N1102.2 (R402.2) Specific Insulation Requirements (Prescriptive)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
In addition to the requirements of Section N1102.1, insulation shall meet the specific requirements of Sections N1102.2.1 through N1102.2.13N1102.2.15.

N1102.2.1 (R402.2.1) Ceilings With Attic Spaces

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Where Section R1102.1.2 would require R-38 insulation in the ceiling, installing R-30 over 100 percent of the ceiling area requiring insulation shall be deemed to satisfy the requirement for R-38 wherever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves. Similarly, where Section R1102.1.2 would require R-49 insulation in the ceiling, installing R-38 over 100 percent of the ceiling area requiring insulation shall be deemed to satisfy the requirement for R-49 insulation wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the U-factor alternative approach in Section R1102.1.4 and the total UA alternative in Section R1102.1.5.

Exceptions:
  1. When insulation is installed in a fully enclosed attic floor system, as described in Appendix E-2.1, R-30 shall be deemed compliant.
  2. In roof edge and other details such as bay windows, dormers, and similar areas where the space is limited, the insulation must fill the space up to the air baffle.

N1102.2.2 (R402.2.2) Ceilings Without Attic Spaces

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Where Section N1102.1.2 would require R-38 insulation levels above R-30 and the design of the roof/ceiling assembly, including cathedral ceilings, bay windows and other similar areas, does not allow sufficient space for the required insulation, the minimum required insulation for such roof/ceiling assemblies shall be R-30. This reduction of insulation from the requirements of Section N1102.1.2 shall be limited to 500 square feet (46 m2) or 20 percent of the total insulated ceiling area, whichever is less. This reduction shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

N1102.2.3 (R402.2.3) Eave Soffit Baffle

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
For air-permeable insulations in vented attics, a baffle shall be installed adjacent to soffit and eave vents. Baffles shall maintain an opening equal or greater than the size of the vent. The baffle shall extend over the top of the attic insulation. The baffle shall be permitted to be any solid material.

N1102.2.4 (R402.2.4) Access Hatches and Doors

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Horizontal access doorshatches from conditioned spaces to unconditioned spaces such as attics and crawl spaces shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfacesan R-10 minimum value and vertical doors to such spaces shall be weatherstripped and insulated to R-5. Access shall be provided to all equipment that prevents damaging or compressing the insulation. A wood-framed or equivalent baffle or retainer is required to be provided when loose-fill insulation is installed, the purpose of which is to prevent the loose-fill insulation from spilling into the living space when the attic access is opened, and to provide a permanent means of maintaining the installed R-value of the loose-fill insulation.

Exceptions: Vertical doors that provide access from conditioned to unconditioned spaces shall be permitted to meet the fenestration requirements of Table N1102.1.2 based on the applicable climate zone specified in Section N1101.7.
  1. Full size vertical doors that provide access from conditioned to unconditioned spaces shall be permitted to meet the fenestration requirements of Table N1102.1.2 based on the applicable climate zone specified in Section N1101.7.
  2. Pull down stair systems shall be weatherstripped and insulated with a minimum R-5 insulation. The insulation shall not interfere with proper operation of the stair. Nonrigid insulation materials are not allowed. Additional insulation systems that enclose the stair system from above are allowed. Exposed foam plastic must meet the provisions of Section R318.

N1102.2.5 (R402.2.5) Mass Walls

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Mass walls for the purposes of this chapter shall be considered above-grade walls of concrete block, concrete, insulated concrete form (ICF), masonry cavity, brick (other than brick veneer), earth (adobe, compressed earth block, rammed earth) and solid timber/logs, or any other walls having a heat capacity greater than or equal to 6 Btu/ft2 × °F (123 kJ/m2 × K)meeting the following. Masonry or concrete walls having a mass greater than or equal to 30 pounds per square foot (146 kg/m2). Solid wood walls having a mass greater than 20 pounds per square foot (98 kg/m2). Any walls having a heat capacity greater than or equal to 6 Btu/ft2 • °F[266 J/(m2 • K)].
Steel-frame ceilings, walls, and floors shall meet the insulation requirements of Table N1102.2.6 or shall meet the U-factor requirements of Table N1102.1.4. The calculation of the U-factor for a steel-frame envelope assembly shall use a series-parallel path calculation method.

TABLE N1102.2.6 (R402.2.6) STEEL-FRAME CEILING, WALL AND FLOOR INSULATION (R-VALUE)

WOOD FRAME
R-VALUE
REQUIREMENT
COLD-FORMED STEEL
EQUIVALENT R-VALUEa
Steel Truss Ceilingsb
R-30 R-38 or R-30 + 3 or R-26 + 5
R-38 R-49 or R-38 + 3
R-49 R-38 + 5
Steel Joist Ceilingsb
R-30 R-38 in 2 × 4 or 2 × 6 or 2 × 8 R-49
in any framing
R-38 R-49 in 2 × 4 or 2 × 6 or 2 × 8 or 2 × 10
Steel-Framed Wall, 16″ on center
R-13 R-13 + 4.2 or R-19 + 2.1 or R-21 + 2.8 or
R-0 + 9.3 or R-15 + 3.8 or R-21 + 3.1
R-13 + 3 R-0 + 11.2 or R-13 + 6.1 or R-15 + 5.7 or
R-19 + 5.0 or R-21 + 4.7
R-20 R-0 + 14.0 or R-13 + 8.9 or R-15 + 8.5 or
R-19 + 7.8 or R-19 + 6.2 or R-21 + 7.5
R-20 + 5 R-13 + 12.7 or R-15 + 12.3 or R-19 + 11.6 or
R-21 + 11.3 or R-25 + 10.9
R-21 R-0 + 14.6 or R-13 + 9.5 or R-15 + 9.1 or
R-19 + 8.4 or R-21 + 8.1 or R-25 + 7.7
Steel-Framed Wall, 24″ on center
R-13 R-0 + 9.3 or R-13 + 3.0 or R-15 + 2.4
R-13 + 3 R-0 + 11.2 or R-13 + 4.9 or R-15 + 4.3 or
R-19 + 3.5 or R-21 + 3.1
R-20 R-0 + 14.0 or R-13 + 7.7 or R-15 + 7.1 or
R-19 + 6.3 or R-21 + 5.9
R-20 + 5 R-13 + 11.5 or R-15 + 10.9 or R-19 + 10.1 or
R-21 + 9.7 or R-25 + 9.1
R-21 R-0 + 14.6 or R-13 + 8.3 or R-15 + 7.7 or
R-19 + 6.9 or R-21 + 6.5 or R-25 + 5.9
Steel Joist Floor
R-13 R-19 in 2 × 6, or R-19 + 6 in 2 × 8 or 2 × 10
R-19 R-19 + 6 in 2 × 6, or R-19 + 12 in 2 × 8 or 2 × 10

a. Cavity insulation R-value is listed first, followed by continuous insulation R-value.
b. Insulation exceeding the height of the framing shall cover the framing.

N1102.2.7 (R402.2.7) Walls With Partial Structural Sheathing

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Where Section N1102.1.2 would require continuous insulation on exterior walls and structural sheathing covers 40 percent or less of the gross area of all exterior walls, the continuous insulation R-value shall be permitted to be reduced by an amount necessary to result in a consistent total sheathing thickness, but not more than R-3, on areas of the walls covered by structural sheathing. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of the exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2. This reduction shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

N1102.2.8 (R402.2.8) Floors

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Floor framing-cavity insulation shall be installed to maintain permanent contact with the underside of the subfloor decking. The distance between tension support wires or other devices that hold the floor insulation in place against the subfloor shall be no more than 18 inches (457 mm). In addition, supports shall be located no further than 6 inches (152 mm) from each end of the insulation.

Exception: The floor framing-cavity insulation shall be permitted to be in contact with the topside of sheathing or continuous insulation installed on the bottom side of floor framing where combined with insulation that meets or exceeds the minimum wood frame wall R-value in Table 1102.1.2 and that extends from the bottom to the top of all perimeter floor framing members.An enclosed floor cavity such as garage ceilings, cantilevers or buildings on pilings with an enclosed floor cavity with the insulation fully in contact with the lower air barrier. In this case, the band boards shall be insulated to maintain thermal envelope continuity.

N1102.2.9 (R402.2.9) Basement Walls

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Walls associated with conditioned basements shall be insulated from the top of the basement wall down to 10 feet (3048 mm) below grade or to the basement floor, whichever is less. Walls associated with unconditioned basements shall meet this requirement unless the floor overhead is insulated in accordance with Sections N1102.1.2 and N1102.2.8. Foam plastic insulation applied to exterior of basement walls shall be provided with termite inspection and treatment gaps in accordance with Appendix O.

N1102.2.10 (R402.2.10) Slab-On-Grade Floors

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Slab-on-grade floors with a floor surface less than 12 inches (305 mm) below grade shall be insulated in accordance with Table N1102.1.2. The insulation shall extend downward from the top of the slab on the outside or inside of the foundation wall. Insulation located below grade shall be extended the distance provided in Table N1102.1.2 by any combination of vertical insulation, insulation extending under the slab or insulation extending out from the building. Insulation extending away from the building shall be protected by pavement or by not less than 10 inches (254 mm) of soil. The top edge of the insulation installed between the exterior wall and the edge of the interior slab shall be permitted to be cut at a 45-degree (0.79 rad) angle away from the exterior wall. Slab-edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation. Slab edge insulation shall have a 2-inch (51 mm) termite inspection gap consistent with Appendix O of this code.

N1102.2.11 (R402.2.11) Closed Crawl Space Walls

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
As an alternative to insulating floors over crawl spaces, crawl space walls shall be permitted to be insulated when the crawl space is not vented to the outside. Crawl space wall insulation shall be permanently fastened to the wall and extend downward from the floor to the finished grade level and then vertically and/or horizontally for at least an additional 24 inches (610 mm). Exposed earth in unvented crawl space foundations shall be covered with a continuous Class I vapor retarder in accordance with this code. All joints of the vapor retarder shall overlap by 6 inches (153 mm) and be sealed or taped. The edges of the vapor retarder shall extend not less than 6 inches (153 mm) up the stem wall and shall be attached to the stem wall. Where the floor above a closed crawl space is not insulated, the exterior crawlspace walls shall be insulated in accordance with Table N1102.1.2.

     Wall insulation may be located in any combination of the outside and inside wall surfaces and within the structural cavities or materials of the wall system.

     Wall insulation requires that the exterior wall band joist area of the floor frame be insulated. Wall insulation shall begin 3 inches (76 mm) below the top of the masonry foundation wall and shall extend down to 3 inches (76 mm) above the top of the footing or concrete floor, 3 inches (76 mm) above the interior ground surface or 24 inches (610 mm) below the outside finished ground level, whichever is less. (See Appendix E-2.2 details.)

     Termite inspection, clearance, and wicking gaps are allowed in wall insulation systems. Insulation may be omitted in the gap area without energy penalty. The allowable insulation gap widths are listed in Table N1102.2.11. If gap width exceeds the allowances, one of the following energy compliance options shall be met:
  1. Wall insulation is not allowed and the required insulation value shall be provided in the floor system.
  2. Compliance shall be demonstrated with energy trade-off methods provided by a North Carolina specific version of RESCHECK or the UA Alternative method or Section N1105.
TABLE N1102.2.11
WALL INSULATION ALLOWANCES FOR TERMITE TREATMENT AND INSULATION GAPS
GAP WIDTH
(inches)
INSULATION LOCATION GAP DESCRIPTION
Minimum Maximum
2 3 Outside Above grade inspection between top of insulation
and bottom of siding
4 6 Outside Below grade treatment
3a 4a Inside Wall inspection between top of insulation and bottom of sill
3a 4a Inside Clearance/wicking space between bottom of insulation
and top of ground surface, footing, or concrete floor
For SI: 1 inch = 25.4 mm.
  1. No insulation shall be required on masonry walls of 9 inches in height or less.
Insulation shall not be required on the horizontal portion of the foundation that supports a masonry veneer.

N1102.2.13 (R402.2.13) Sunroom Insulation

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Sunrooms enclosing conditioned spaces shall meet the insulation requirements of this code.

Exception: For sunrooms with thermal isolation, and enclosing conditioned spaces, the following exceptions to the insulation requirements of this code shall apply:
  1. The minimum ceiling insulation R-values shall be R-19 in Zones 1 through3 and 4 and R-24 in Zones 5 through 8.
  2. The minimum wall R-value shall be R-13 in all climate zones. New walls separating a sunroom with a thermal isolation from conditioned space shall meet the building thermal envelope requirements of this code.

N1102.2.14 (R402.2.14) Framed cavity walls

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The exterior thermal envelope wall insulation shall be installed in contact and continuous alignment with the building envelope air barrier. Insulation shall be free from installation gaps, voids, or compression. For framed walls, the cavity insulation shall be enclosed on all sides with solid rigid material or an air barrier material. Polyethylene shall not be allowed. Rim joists are not required to be enclosed on all sides. Wall insulation shall be enclosed at the following locations when installed on exterior walls prior to being covered by subsequent construction, consistent with Appendix E-2.3 of this code:
  1. Tubs
  2. Showers
  3. Stairs
  4. Fireplace units (Enclose with rigid material only)

N1102.2.15 (R402.2.15) Attic knee walls

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Enclosure of wall cavity insulation also applies to walls that adjoin attic spaces by placing a rigid material or air barrier material on the attic space side of the wall on the attic space side of the wall consistent with Appendix E-2.3 of this code. Noninsulating class I vapor retarders, such as polyethylene, shall not be allowed.
In addition to the requirements of Section N1102, fenestration shall comply with Sections N1102.3.1 through N1102.3.5.
An area-weighted average of fenestration products shall be permitted to satisfy the U-factor requirements.
An area-weighted average of fenestration products more than 50-percent glazed shall be permitted to satisfy the SHGC requirements.

Dynamic glazing shall be permitted to satisfy the SHGC requirements of Table N1102.1.2 provided the ratio of the higher to lower labeled SHGC is greater than or equal to 2.4, and the dynamic glazing is automatically controlled to modulate the amount of solar gain into the space in multiple steps. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.

Exception: Dynamic glazing is not required to comply with this section when both the lower and higher labeled SHGC already comply with the requirements of Table N1102.1.2.

N1102.3.3 (R402.3.3) Glazed Fenestration Exemption

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Up to 15Either two glazed fenestration assemblies or up to 24 square feet (1.42.2 m2) of glazed fenestration per dwelling unit shall be permitted to be exempt from U-factor and SHGC requirements in Section N1102.1.2. This exemption shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

N1102.3.4 (R402.3.4) Opaque Door Exemption

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Opaque doors separating conditioned from unconditioned space shall have a maximum U-factor of 0.35.

Exception: One side-hinged opaque door assembly up to 24 square feet (2.22 m2) in area is exempted from the U-factor requirement in Section N1102.1.2. This exemption shall not apply to the U-factor alternative approach in Section N1102.1.4 and the total UA alternative in Section N1102.1.5.

N1102.3.5 (R402.3.5) Sunroom Fenestration

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Sunrooms enclosing conditioned space shall meet the fenestration requirements of this code.

Exceptions: For sunrooms with thermal isolation and enclosing conditioned space in Climate Zones 2 through 8, the maximum fenestration U-factor shall be 0.45 and the maximum skylight U-factor shall be 0.70.

  1. For sunrooms with thermal isolation and enclosing conditioned space in Climate Zones 3 through 5, the maximum fenestration U-factor shall be 0.45 and the maximum skylight U-factor shall be 0.75. Sunrooms with cooling systems shall have a maximum fenestration SHGC of 0.40 for all glazing.
  2. A maximum of two glazed fenestration product assemblies having a U-factor no greater than 0.55 and, when cooling is provided, a SHGC no greater than 0.70 shall be permitted to be substituted for minimum code compliant fenestration product assemblies without penalty.
     New fenestration separating the sunroom with thermal isolation from conditioned space shall meet the building thermal envelope requirements of this code.

N1102.4 (R402.4) Air Leakage control (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections N1102.4.1 through N1102.4.5N1102.4.6.

N1102.4.1 (R402.4.1) Building Thermal Envelope

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The building thermal envelope shall comply with Sections N1102.4.1.1 and N1102.4.1.2be durably sealed to limit infiltration. The sealing methods between dissimilar materials shall allow for differential expansion and contraction. For all homes, where present, the following shall be caulked, gasketed, weatherstripped or otherwise sealed with an air barrier material, or solid material consistent with Appendix E-2.4 of this code:
  1. Blocking and sealing floor/ceiling systems and under knee walls open to unconditioned or exterior space.
  2. Capping and sealing shafts or chases, including flue shafts.
  3. Capping and sealing soffit or dropped ceiling areas.
  4. Sealing HVAC register boots and return boxes to subfloor or drywall.
  5. Seal exterior house wrap material joints and seams in accordance with manufacturer’s instructions or, if house wrap joints are not sealed, seal exterior sheathing and exposed band joist joints including perimeter joints and edges of these materials.

    Exceptions:
    1. Spray foam in building thermal envelope wall systems.
    2. Wall sheathing joints where wall sheathing is fully glued to framing.

N1102.4.1.1 (R402.4.1.1) Installation

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The components of the building thermal envelope as listed in Table N1102.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria listed in Table N1102.4.1.1, as applicable to the method of construction. Where required by the building official, an approved third party shall inspect all components and verify compliance.

TABLE N1102.4.1.1 (R402.4.1.1) AIR BARRIER AND INSULATION INSTALLATION

COMPONENT AIR BARRIER CRITERIA INSULATION INSTALLATION CRITERIA
General requirements A continuous air barrier shall be installed in the building
envelope.
The exterior thermal envelope contains a continuous air
barrier.
Breaks or joints in the air barrier shall be sealed.
Air-permeable insulation shall not be used as a sealing
material.
Ceiling/attic The air barrier in any dropped ceiling/soffit shall be
aligned with the insulation and any gaps in the air barrier
sealed.
Access openings, drop down stairs or knee wall doors to
unconditioned attic spaces shall be sealed.
The insulation in any dropped ceiling/soffit shall be
aligned with the air barrier.
Walls The junction of the foundation and sill plate shall be sealed.
The junction of the top plate and the top of exterior walls
shall be sealed.
Knee walls shall be sealed.
Cavities within corners and headers of frame walls
shall be insulated by completely filling the cavity with
a material having a thermal resistance of R-3 per inch
minimum.
Exterior thermal envelope insulation for framed walls
shall be installed in substantial contact and continuous
alignment with the air barrier.
Windows, skylights and doors The space between window/door jambs and framing, and
skylights and framing shall be sealed.
Rim joists Rim joists shall include the air barrier. Rim joists shall be insulated.
Floors (including above garage
and cantilevered floors)
The air barrier shall be installed at any exposed edge
of insulation.
Floor framing cavity insulation shall be installed to
maintain permanent contact with the underside of
subfloor decking, or floor framing cavity insulation
shall be permitted to be in contact with the top side of
sheathing, or continuous insulation installed on the
underside of floor framing; and extends from the
bottom to the top of all perimeter floor framing
members.
Crawl space walls Exposed earth in unvented crawl spaces shall be covered
with a Class I vapor retarder with overlapping joints taped.
Where provided instead of floor insulation, insulation
shall be permanently attached to the crawl space walls.
Shafts, penetrations Duct shafts, utility penetrations, and flue shafts opening to
exterior or unconditioned space shall be sealed.
Narrow cavities Batts in narrow cavities shall be cut to fit, or narrow
cavities shall be filled by insulation that on installation
readily conforms to the available cavity space.
Garage separation Air sealing shall be provided between the garage and
conditioned spaces.
Recessed lighting Recessed light fixtures installed in the building thermal
envelope shall be sealed to the drywall.
Recessed light fixtures installed in the building
thermal envelope shall be air tight and IC rated.
Plumbing and wiring Batt insulation shall be cut neatly to fit around wiring
and plumbing in exterior walls, or insulation that on
installation readily conforms to available space shall
extend behind piping and wiring.
Shower/tub on exterior wall The air barrier installed at exterior walls adjacent to
showers and tubs shall separate them from the showers and
tubs.
Exterior walls adjacent to showers and tubs shall be
insulated.
Electrical/phone box on exterior
walls
The air barrier shall be installed behind electrical or
communication boxes or air-sealed boxes shall be installed.
HVAC register boots HVAC register boots that penetrate building thermal
envelope shall be sealed to the subfloor or drywall.
Concealed sprinklers When required to be sealed, concealed fire sprinklers shall
only be sealed in a manner that is recommended by
the manufacturer. Caulking or other adhesive sealants shall not
be used to fill voids between fire sprinkler cover plates and
walls or ceilings.

a. In addition, inspection of log walls shall be in accordance with the provisions of ICC 400.

N1102.4.1.2 (R402.4.1.2) Testing

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding five air changes per hour in Climate Zones 1 and 2, and three air changes per hour in Climate Zones 3 through 8. Testing shall be conducted in accordance with ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2 inches w.g. (50 Pascals). Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope.

During testing:
  1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weatherstripping or other infiltration control measures.
  2. Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures.
  3. Interior doors, if installed at the time of the test, shall be open.
  4. Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.
  5. Heating and cooling systems, if installed at the time of the test, shall be turned off.
  6. Supply and return registers, if installed at the time of the test, shall be fully open.

N1102.4.2 Air sealing

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Building envelope air tightness shall be demonstrated by compliance with Section N1102.4.2.1 or N1102.4.2.2. Appendix E-3 contains optional sample worksheets for visual inspection or testing for the permit holder’s use only.

TABLE N1102.4.2
AIR BARRIER INSPECTION
COMPONENT CRITERIA
Ceiling/attic Sealants or gaskets provide a continuous air barrier system joining the top plate of framed walls with either the ceiling drywall or the top edge of wall drywall to prevent air leakage. Top plate penetrations are sealed. For ceiling finishes that are not air barrier systems such as tongue-and-groove planks, air barrier systems (for example, taped house wrap), shall be used above the finish
Note: It is acceptable that sealants or gaskets applied as part of the application of the drywall will not be observable by the code official.
Walls Sill plate is gasketed or sealed to subfloor or slab.
Windows and doors Space between window and exterior door jambs and framing is
sealed.
Floors (including above-garage and cantilevered floors) Air barrier system is installed at any exposed edge of insulation.
Penetrations Utility penetrations through the building thermal envelope, including those for plumbing, electrical wiring, ductwork, security and fire alarm wiring, and control wiring, shall be sealed.
Garage separation Air sealing is provided between the garage and conditioned spaces. An air barrier system shall be installed between the ceiling system above the garage and the ceiling system of interior spaces.
Ceiling penetrations Ceiling electrical box penetrations and ceiling mechanical box penetrations shall be caulked, gasketed, or sealed at the penetration of the ceiling finish. See Appendix E-2.4.

Exception: Ceiling electrical boxes and ceiling mechanical boxes not penetrating the building thermal envelope.
Recessed lighting Recessed light fixtures are air tight, IC-rated, and sealed to drywall.

Exception: Fixtures in conditioned space.

N1102.4.2.1 Visual inspection option

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Building envelope tightness shall be considered acceptable when items providing insulation enclosure in Section N1102.2.14 and enclosure and air sealing in Section N1102.2.15 and air sealing in Section N1102.4.1 are addressed and when the items listed in Table N1102.4.2, applicable to the method of construction, are certified by the builder, permit holder or registered design professional via the certificate in Appendix E-1.

N1102.4.2.2 Testing option

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Building envelope tightness shall be considered acceptable when items providing insulation enclosure in Section N1102.2.14 and enclosure and air sealing in Section N1102.2.15 and air sealing in Section N1102.4.1 are addressed and when tested air leakage is less than or equal to one of the two following performance measurements:

Test Criteria:
  1. 0.30 CFM50/Square Foot of Surface Area (SFSA) or
  2. Five (5) air changes per hour (ACH50)
     When tested with a blower door fan assembly, at a pressure of 33.5 psf (50 Pa). A single point depressurization, not temperature corrected, test is sufficient to comply with this provision, provided that the blower door fan assembly has been certified by the manufacturer to be capable of conducting tests in accordance with ASTM E779 or ASTM E1827. Testing shall occur after rough in and after installation of penetrations of the building envelope, including penetrations for utilities, plumbing, electrical, ventilation and combustion appliances. Testing shall be reported by the permit holder, a North Carolina licensed general contractor, a North Carolina licensed HVAC contractor, a North Carolina licensed Home Inspector, a registered design professional, a certified BPI envelope professional or a certified HERS rater.

During testing:
  1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed;
  2. Dampers shall be closed, but not sealed, including exhaust, backdraft, and flue dampers;
  3. Interior doors shall be open;
  4. Exterior openings for continuous ventilation systems, air intake ducted to the return side of the conditioning system, and energy or heat recovery ventilators shall be closed and sealed;
  5. Heating and cooling system(s) shall be turned off; and
  6. Supply and return registers shall not be sealed.
     The air leakage information, building air leakage result, tester name, date, and contact information, shall be included on the certificate described in Section N1101.14.

     For Test Criteria 1 in this section, the report shall be produced in the following manner: perform the blower door test and record the CFM50. Calculate the total square feet of surface area for the building thermal envelope (all floors, ceilings, and walls including windows and doors, bounding conditioned space) and record the area. Divide CFM50 by the total square feet and record the result. If the result is less than or equal to [0.30 CFM50/SFSA] the envelope tightness is acceptable; or

     For Test Criteria 2, the report shall be produced in the following manner: Perform a blower door test and record the CFM50. Multiply the CFM50 by 60 minutes to create CFHour50 and record. Then calculate the total conditioned volume of the home and record. Divide the CFH50 by the total volume and record the result. If the result is less than or equal to 5 ACH50 the envelope tightness is acceptable.

N1102.4.2 N1102.4.3 (R402.4.2) (R402.4.3) Fireplaces

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
New wood-burning fireplaces shall have tight-fitting flue dampers or doors, and outdoor combustion air. Where using tight-fitting doors on factory-built fireplaces listed and labeled in accordance with UL 127, the doors shall be tested and listed for the fireplace. Where using tight-fitting doors on masonry fireplaces, the doors shall be listed and labeled in accordance with UL 907. Site-built masonry fireplaces shall have flue dampers and comply with Section R1006 for combustion air.

N1102.4.3 N1102.4.4 (R402.4.3) (R402.4.4) Fenestration Air Leakage

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Windows, skylights and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfm per square foot (1.5 L/s/m2), and swinging doors no more than 0.5 cfm per square foot (2.6 L/s/m2), when tested according to NFRC 400 or AAMA/WDMA/CSA 101/I.S.2/A440 by an accredited, independent laboratory and listed and labeled by the manufacturer.

Exception: Site-builtField-fabricated windows, skylights and doors.

N1102.4.4 (R402.4.4) Rooms Containing Fuel-Burning Appliances

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
In Climate Zones 3 through 8, where open combustion air ducts provide combustion air to open combustion fuel-burning appliances, the appliances and combustion air opening shall be located outside the building thermal envelope or enclosed in a room, isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table N1102.1.2, where the walls, floors and ceilings shall meet a minimum of the basement wall R-value requirement. The door into the room shall be fully gasketed and any water lines and ducts in the room insulated in accordance with Section N1103. The combustion air duct shall be insulated where it passes through conditioned space to a minimum of R-8.

Exceptions:

1. Direct vent appliances with both intake and exhaust pipes installed continuous to the outside.

2. Fireplaces and stoves complying with Sections N1102.4.2 and R1006.

N1102.4.5 N1102.4.6 (R402.4.5)(R402.4.6) Recessed Lighting

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as having an air leakage rate not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior wall or ceiling covering.

N1102.5 (R402.5) Maximum Fenestration U-Factor and SHGC (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The area-weighted average maximum fenestration U-factor permitted using trade-offs from Section N1102.1.5 or N1105 shall be 0.48in Climate Zones 4 and 5 and 0.40 in Climate Zones 6 through 8 for vertical fenestration, and 0.75 in Climate Zones 4 through 8 for skylights. The area-weighted average maximum fenestration SHGC permitted using trade-offs from Section N1105 in Climate Zones 1 through 3 shall be 0.50. Maximum skylight U-factors shall be 0.65 in Zones 4 and 5 and 0.60 in Zone 3. The areaweighted average maximum fenestration SHGC permitted using trade-offs from Section N1105 in Zone 3 shall be 0.50.

Exception: A maximum of two glazed fenestration product assemblies having a U-factor no greater than 0.55 and a SHGC no greater than 0.70 shall be permitted to be substituted for minimum code compliant fenestration product assemblies without penalty.
At least one thermostat shall be provided for each separate heating and cooling system.

N1103.1.1 (R403.1.1) Programmable Thermostat

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
When the primary heating system is a forced air furnace or heat pump, the thermostat controlling the primary heating or cooling system of the dwelling unit shall be capable of controlling the heating and cooling system on a daily schedule to maintain different temperature set points at different times of the day. This thermostat shall include the capability to set back or temporarily operate the system to maintain zone temperatures down to 55°F (13°C) or up to 85°F (29°C). The thermostat shall initially be programmed by the manufacturer with a heating temperature set point no higher than 70°F (21°C) and a cooling temperature set point no lower than 78°F (26°C).

N1103.1.2 (R403.1.2) Heat Pump Supplementary Heat (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Heat pumps having supplementary electric-resistance heat shall have controls that, except during defrost, prevent supplemental heat operation when the heat pump compressor can meet the heating load.

     A heat strip outdoor temperature lockout thermostat shall be provided to prevent supplemental heat operation in response to the thermostat being changed to a warmer setting. The lockout shall be set no lower than 35°F (2°C) and no higher than 40°F (4°C).

Exceptions:
  1. In lieu of a heat strip outdoor temperature lockout thermostat, the following time and temperature electric-resistance control may be used. After six minutes of compressor run time in heat mode, supplemental electric heat shall energize only if the leaving air temperature from the indoor coil is below 90°F (32°C). If the indoor coil leaving air temperature exceeds 100°F (38°C), supplemental heat shall automatically de-energize, but allow the compressor to continue to operate until the call is satisfied. No thermostat shall initiate supplemental electric heat at any time. Thermostat controlled emergency heat shall not be limited by outdoor temperature. Electric resistance supplemental heat during defrost shall operate normally without limitation.
  2. In lieu of a heat strip outdoor temperature lockout thermostat, a programmable indoor thermostat with the capability to minimize the use of supplementary electrical resistance heat using an automatic temperature ramp up control feature shall be acceptable.
Hot water boilers that supply heat to the building through one- or two-pipe heating systems shall have an outdoor setback control that lowers the boiler water temperature based on the outdoor temperature.

N1103.3 (R403.3) Ducts

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Ducts and air handlers shall be in accordance with Sections N1103.3.1 through N1103.3.5N1103.3.4.

N1103.3.1 (R403.3.1) Insulation (Prescriptive) (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Supply and return ducts in attics shall be insulated to a minimum of R-8 where 3 inches (76.2 mm) in diameter and greater and R-6 where less than 3 inches (76.2 mm) in diameter. Supply and return ducts in other portions of the building shall be insulated to a minimum of R-6 where 3 inches (76.2 mm) in diameter or greater and R-4.2 where less than 3 inches (76.2 mm) in diameter.

Exception: Ducts or portions thereof located completely inside the building thermal envelope.
Supply and return ducts in unconditioned space and outdoors shall be insulated to a minimum R-8. Supply ducts inside semi-conditioned space shall be insulated to a minimum R-4; return ducts inside conditioned and semi-conditioned space are not required to be insulated. Ducts located inside conditioned space are not required to be insulated other than as may be necessary for preventing the formation of condensation on the exterior of cooling ducts.

N1103.3.2 (R403.3.2) Sealing (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Ducts, air handlers and filter boxes, filter boxes and building cavities used as ducts shall be sealed. Joints and seams shall comply with either the International Mechanical Code or Section M1601.4.1 of this code, as applicable.

Exceptions:
  1. Air-impermeable spray foam products shall be permitted to be applied without additional joint seals.
  2. For ducts having a static pressure classification of less than 2 inches of water column (500 Pa), additional closure systems shall not be required for continuously welded joints and seams, and locking-type joints and seams of other than the snap-lock and button-lock types.

N1103.3.2.1 (R403.3.2.1) Sealed Air Handler

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Air handlers shall have a manufacturer's designation for an air leakage of no more than 2 percent of the design air flow rate when tested in accordance with ASHRAE 193.

N1103.3.3 (R403.3.3) Duct leakage (Prescriptive) and duct testing (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Ducts shall be pressure tested to determine air leakage by one of the following methods:
  1. Rough-in test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the system, including the manufacturer's air handler enclosure if installed at the time of the test. All registers shall be taped or otherwise sealed during the test.
  2. Postconstruction test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. Registers shall be taped or otherwise sealed during the test.
Exception: A duct air leakage test shall not be required where the ducts and air handlers are located entirely within the building thermal envelope.

A written report of the results of the test shall be signed by the party conducting the test and provided to the code official.
Duct testing and duct leakage shall be verified by compliance with either Section N1103.3.3.1 or N1103.3.3.2. Duct testing shall be performed and reported by the permit holder, a North Carolina licensed general contractor, a North Carolina licensed HVAC contractor, a North Carolina licensed Home Inspector, a registered design professional, a certified BPI envelope professional or a certified HERS rater. A single point depressurization, not temperature corrected, test is sufficient to comply with this provision, provided that the duct testing fan assembly(s) has been certified by the manufacturer to be capable of conducting tests in accordance with ASTM E1554-07.

     The duct leakage information, including duct leakage test selected and result, tester name, date, and contact information, shall be included on the certificate described in Section N1101.14.

     For the Test Criteria, the report shall be produced in the following manner: perform the HVAC system air leakage test and record the CFM25. Calculate the total square feet of conditioned floor area (CFA) served by that system. Multiply CFM25 by 100, divide the result by the CFA and record the result. If the result is less than or equal to 5 CFM25/100SF for the “Total duct leakage” test or less than or equal to 4 CFM25/100SF for the “Duct leakage to the outside” test, then the HVAC system air tightness is acceptable. Appendix E-3C contains optional sample worksheets for duct testing for the permit holder’s use only.

Exceptions:
  1. Duct systems or portions thereof inside the building thermal envelope shall not be required to be leak tested.
  2. Installation of a partial system as part of replacement, renovation or addition does not require a duct leakage test.
  3. Duct systems (complete) serving areas of 750 square feet or less shall not need to be required to be leak tested.

N1103.3.3.1 Total duct leakage

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Total duct leakage shall be less than or equal to 5 CFM (141.6 L/min) per 100 square feet (9.29 m2) of conditioned floor area served by that system when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, including the manufacturer’s air handler enclosure.

During testing:
  1. Block, if present, ventilation air duct(s) connected to the conditioning system.
  2. The duct air leakage testing equipment shall be attached to the largest return in the system or to the air handler.
  3. The filter shall be removed and the air handler power shall be turned off.
  4. Supply boots or registers and return boxes or grilles shall be taped, plugged, or otherwise sealed air tight.
  5. The hose for measuring the 25 Pascals of pressure differential shall be inserted into the boot of the supply that is nominally closest to the air handler.
  6. Specific instructions from the duct testing equipment manufacturer shall be followed to reach duct test pressure and measure duct air leakage.

N1103.3.3.2 Duct leakage to the outside

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Conduct the test using fan pressurization of distribution system and building at a fixed reference pressure for combined supply and return leak. Duct leakage to the outside shall be less than or equal to 4 CFM (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area served by that system when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, relative to the outside, including the manufacturer’s air handler enclosure.

During testing:
  1. Block, if present, the ventilation air duct(s) connected to the conditioning system.
  2. The duct air leakage testing equipment shall be attached to the largest return in the system or to the air handler.
  3. The filter shall be removed and the air handler power shall be turned off.
  4. Supply boots or registers and return boxes or grilles shall be taped, plugged, or otherwise sealed air tight or as tight as possible.
  5. The hose for measuring the 25 Pascals of pressure differential shall be inserted into the boot of the supply that is nominally closest to the air handler.
  6. Open all interconnecting doors in the building, close dampers for fireplaces and other operable dampers.
  7. Set up an envelope air moving/flow-regulating/flow measurement assembly, such as a blower door, following the manufacturer’s prescribed procedure.
  8. Specific instructions from the duct testing equipment manufacturer shall be followed to reach duct test pressure and measure duct air leakage used in combination with a blower door. Typical steps are as follows:
    1. Depressurize the ductwork system to 25 Pa using the measurement hose in Step 5.
    2. Depressurize the house to 25 Pa using an envelope air moving/flow-regulating/flow measurement assembly, such as a blower door.
    3. Correct the duct pressure to measure 0 Pa of pressure differential between the house and the ductwork system.
    4. Read the CFM of duct leakage using the procedures for the specific equipment being used. (Note that most automatically calculating pressure gauges cannot compute the CFM25 automatically with a ductto-house difference in pressure of 0 Pa, so the gauge setting should be set to read CFM instead of CFM25).

N1103.3.4 (R403.3.4) Duct Leakage (Prescriptive)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The total leakage of the ducts, where measured in accordance with Section R403.3.3, shall be as follows:

1. Rough-in test: The total leakage shall be less than or equal to 4 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area where the air handler is installed at the time of the test. Where the air handler is not installed at the time of the test, the total leakage shall be less than or equal to 3 cubic feet per minute (85 L/min) per 100 square feet (9.29 m2) of conditioned floor area.

2. Postconstruction test: Total leakage shall be less than or equal to 4 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area.

N1103.3.5 N1103.3.4 (R403.3.5) (R403.3.4) Building Cavities (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Building framing cavities shall not be used as supply ducts or supply plenums.
Mechanical system piping capable of carrying fluids above 105°F (41°C) or below 55°F (13°C) shall be insulated to a minimum of R-3.

N1103.4.1 (R403.4.1) Protection of Piping Insulation

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Piping insulation exposed to weather shall be protected from damage, including that caused by sunlight, moisture, equipment maintenance and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Adhesive tape shall not be permitted.

N1103.5 (R403.5) Service Hot Water Systems

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Energy conservation measures for service hot water systems shall be in accordance with Sections N1103.5.1 through N1103.5.4. All circulating service hot water piping shall be insulated to at least R-2. Circulating hot water systems shall include an automatic or readily accessible manual switch that can turn off the hot water circulating pump when the system is not in use.

N1103.5.1 (R403.5.1) Heated Water Circulation and Temperature Maintenance Systems (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Heated water circulation systems shall be in accordance with Section R1103.5.1.1. Heat trace temperature maintenance systems shall be in accordance with Section R1103.5.1.2. Automatic controls, temperature sensors and pumps shall be accessible. Manual controls shall be readily accessible.

N1103.5.1.1 (R403.5.1.1) Circulation Systems

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Heated water circulation systems shall be provided with a circulation pump. The system return pipe shall be a dedicated return pipe or a cold water supply pipe. Gravity and thermo-syphon circulation systems shall be prohibited. Controls for circulating hot water system pumps shall start the pump based on the identification of a demand for hot water within the occupancy. The controls shall automatically turn off the pump when the water in the circulation loop is at the desired temperature and when there is no demand for hot water.

N1103.5.1.2 (R403.5.1.2) Heat Trace Systems

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Electric heat trace systems shall comply with IEEE 515.1 or UL 515. Controls for such systems shall automatically adjust the energy input to the heat tracing to maintain the desired water temperature in the piping in accordance with the times when heated water is used in the occupancy.

N1103.5.2 (R403.5.2) Demand Recirculation Systems

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
A water distribution system having one or more recirculation pumps that pump water from a heated water supply pipe back to the heated water source through a cold water supply pipe shall be a demand recirculation water system. Pumps shall have controls that comply with both of the following:

1. The control shall start the pump upon receiving a signal from the action of a user of a fixture or appliance, sensing the presence of a user of a fixture or sensing the flow of hot or tempered water to a fixture fitting or appliance.

2. The control shall limit the temperature of the water entering the cold water piping to 104°F (40°C).

N1103.5.3 (R403.5.3) Hot Water Pipe Insulation (Prescriptive)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Insulation for hot water pipe with a minimum thermal resistance (R-value) of R-3 shall be applied to the following:

1. Piping 3/4 inch (19 mm) and larger in nominal diameter.

2. Piping serving more than one dwelling unit.

3. Piping located outside the conditioned space.

4. Piping from the water heater to a distribution manifold.

5. Piping located under a floor slab.

6. Buried piping.

7. Supply and return piping in recirculation systems other than demand recirculation systems.

N1103.5.4 (R403.5.4) Drain Water Heat Recovery Units

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Drain water heat recovery units shall comply with CSA 55.2. Drain water heat recovery units shall be tested in accordance with CSA 55.1. Potable water-side pressure loss of drain water heat recovery units shall be less than 3 psi (20.7 kPa) for individual units connected to one or two showers. Potable water-side pressure loss of drain water heat recovery units shall be less than 2 psi (13.8 kPa) for individual units connected to three or more showers.
The building shall be provided with ventilation that meets the requirements of Section M1507 of this code or the International Mechanical Code, as applicable, or with other approved means of ventilation. Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.

N1103.6.1 (R403.6.1) Whole-House Mechanical Ventilation System Fan Efficacy

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
When installed to function as a whole-house mechanical ventilation system, fans shall meet the efficacy requirements of Table N1103.6.1.

Exception: Where whole-house mechanical ventilation fans are integral to tested and listed HVAC equipment, they shall be powered by an electronically commutated motor.

TABLE N1103.6.1 (R403.6.1) WHOLE-HOUSE MECHANICAL VENTILATION SYSTEM FAN EFFICACY

FAN LOCATION AIR FLOW RATE MINIMUM
(CFM)
MINIMUM EFFICACYa
(CFM/WATT)
AIR FLOW RATE MAXIMUM
(CFM)
Range hoods Any 2.8 cfm/watt Any
In-line fan Any 2.8 cfm/watt Any
Bathroom, utility room 10 1.4 cfm/watt < 90
Bathroom, utility room 90 2.8 cfm/watt Any

For SI: 1 cubic foot per minute = 28.3 L/min.
a. When tested in accordance with HVI Standard 916

N1103.7 (R403.7) Equipment Sizing and Efficiency Rating (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. New or replacement heating and cooling equipment shall have an efficiency rating equal to or greater than the minimum required by federal law for the geographic location where the equipment is installed.

N1103.8 (R403.8) Systems Serving Multiple Dwelling Units (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Building mechanical systems and service water heating systems serving multiple dwelling units shall comply with Sections C403 and C404 of the IECC—Commercial Provisions in lieu of Section N1103.

N1103.9 (R403.9) Snow Melt System Controls (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Snow- and ice-melting systems, supplied through energy service to the building, shall include automatic controls capable of shutting off the system when the pavement temperature is above 50°F (10°C), and no precipitation is falling and an automatic or manual control that will allow shutoff when the outdoor temperature is above 40°F (4.8°C).
The energy consumption of pools and permanent spas shall be in accordance with Sections N1103.10.1 through N1103.10.3.

N1103.10.1 (R403.10.1) Heaters

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The electric power to heaters shall be controlled by a readily accessible on-off switch that is an integral part of the heater mounted on the exterior of the heater, or external to and within 3 feet (914 mm) of the heater. Operation of such switch shall not change the setting of the heater thermostat. Such switches shall be in addition to a circuit breaker for the power to the heater. Gas-fired heaters shall not be equipped with continuously burning ignition pilots. All heaters shall be equipped with a readily accessible on-off switch that is mounted outside of the heater to allow shutting off the heater without adjusting the thermostat setting. Gas-fired heaters shall not be equipped with constantly burning pilot lights.
Time switches or other control methods that can automatically turn off and on according to a preset schedule shall be installed for heaters and pump motors. Heaters and pump motors that have built-in time switches shall be in compliance with this section.

Exceptions:

1. Where public health standards require 24-hour pump operation.

2. Pumps that operate solar- and waste-heat-recovery pool heating systems.

N1103.10.3 (R403.10.3) Covers

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Outdoor heated pools and outdoor permanent spas shall be provided with a Class 1 vapor-retardant cover or other approved vapor-retardant means.

Exception: Where more than 70 percent of the energy for heating, computed over an operation season, is from site-recovered energy, such as from a heat pump or solar energy source, covers or other vapor-retardant means shall not be required. Pools deriving over 70 percent of the energy from heating from a site-recovered energy or solar energy source.

N1103.11 (R403.11) Portable Spas (Mandatory)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The energy consumption of electric-powered portable spas shall be controlled by the requirements of APSP-14.
Residential swimming pools and permanent residential spas that are accessory to detached one- and two-family dwellings and townhouses 3 stories or less in height above grade plane and that are available only to the household and its guests shall be in accordance with APSP-15.
Not less than 75 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or not less than 75 percent of the permanently installed lighting fixtures shall contain only high-efficacy lamps.

Exception: Low-voltage lighting.
Fuel gas lighting systems shall not have continuously burning pilot lights.

N1105.1 (R405.1) Scope

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
This section establishes criteria for compliance using simulated energy performance analysis. Such analysis shall include heating, cooling and service water heating energy only.those items identified in Table N1105.5.2(1), as applicable. A registered design professional is required to perform the analysis if required by North Carolina licensure laws.

N1105.2 (R405.2) Mandatory Requirements

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Compliance with this section requires that the mandatory provisions identified in Section N1101.13N1101.13(2) be met. All supply and return ducts not completely inside the building thermal envelope shall be insulated to a minimum of R-6.
Compliance based on simulated energy performance requires that a proposed residence (proposed design) be shown to have an annual energy cost that is less than or equal to the annual energy cost of the standard reference design. Energy prices shall be taken from a source approved by the building official, such as the Department of Energy, Energy Information Administration's State Energy Price and Expenditure Report. Building officials shall be permitted to require time-of-use pricing in energy cost calculations.

Exception: The energy use based on source energy expressed in Btu (J) or Btu per square foot (J/m2) of conditioned floor area shall be permitted to be substituted for the energy cost. The source energy multiplier for electricity shall be 3.16. The source energy multiplier for fuels other than electricity shall be 1.1.
Documentation of the software used for the performance design and the parameters for the building shall be in accordance with Sections N1105.4.1 through N1105.4.3.
Documentation verifying that the methods and accuracy of the compliance software tools conform to the provisions of this section shall be provided to the building official.

N1105.4.2 (R405.4.2) Compliance Report

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Compliance software tools shall generate a report that documents that the proposed design complies with Section N1105.3. A compliance report on the proposed design shall be submittedwith the application for the building permit. Upon completion of the building, a compliance report based on the as-built condition of the building shall be submitted to the code official before a certificate of occupancy is issued. Batch sampling of buildings to determine energy code compliance for all buildings in the batch shall be prohibited. A compliance report shall include the following:
  1. Building street address, or other building site identification.
  2. A statement indicating that the proposed design complies with Section N1105.3.
  3. An inspection checklist documenting the building component characteristics of the proposed design as indicated in Table N1105.5.2(1). The inspection checklist shall show results for both the standard reference design and the proposed design with user inputs to the compliance software to generate the results.
  4. A site-specific energy analysis report that is in compliance with Section N1105.3.
  5. The name of the individual performing the analysis and generating the report.
  6. The name and version of the compliance software tool.


Compliance reports shall include information in accordance with Sections N1105.4.2.1 and N1105.4.2.2. Where the proposed design of a building could be built on different sites where the cardinal orientation of the building on each site is different, compliance of the proposed design for the purposes of the application for the building permit shall be based on the worst-case orientation, worst-case configuration, worst-case building air leakage and worst-case duct leakage. Such worst-case parameters shall be used as inputs to the compliance software for energy analysis.

N1105.4.2.1 (R405.4.2.1) Compliance Report for Permit Application

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
A compliance report submitted with the application for building permit shall include the following:

1. Building street address, or other building site identification.

2. A statement indicating that the proposed design complies with Section N1105.3.

3. An inspection checklist documenting the building component characteristics of the proposed design as indicated in Table N1105.5.2(1). The inspection checklist shall show results for both the standard reference design and the proposed design with user inputs to the compliance software to generate the results.

4. A site-specific energy analysis report that is in compliance with Section N1105.3.

5. The name of the individual performing the analysis and generating the report.

6. The name and version of the compliance software tool.

N1105.4.2.2 (R405.4.2.2) Compliance Report for Certificate of Occupancy

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
A compliance report submitted for obtaining the certificate of occupancy shall include the following:

1. Building street address, or other building site identification.

2. A statement indicating that the as-built building complies with Section N1105.3.

3. A certificate indicating that the building passes the performance matrix for code compliance and listing the energy saving features of the buildings.

4. A site-specific energy analysis report that is in compliance with Section N1105.3.

5. The name of the individual performing the analysis and generating the report.

6. The name and version of the compliance software tool.
The building official shall be permitted to require the following documents:

1. Documentation of the building component characteristics of the standard reference design.

2. A certification signed by the builder providing the building component characteristics of the proposed design as given in Table N1105.5.2(1).

3. Documentation of the actual values used in the software calculations for the proposed design.
Calculations of the performance design shall be in accordance with Sections N1105.5.1 and N1105.5.2.
Except as specified by this section, the standard reference design and proposed design shall be configured and analyzed using identical methods and techniques.

N1105.5.2 (R405.5.2) Residence Specifications

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The standard reference design and proposed design shall be configured and analyzed as specified by Table N1105.5.2(1). Table N1105.5.2(1) shall include, by reference, all notes contained in Table N1102.1.2.

TABLE N1105.5.2(1) [R405.5.2(1)]
SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS
BUILDING COMPONENT STANDARD REFERENCE DESIGN PROPOSED DESIGN
Above-grade walls Type: mass wall if proposed wall is mass; otherwise wood frame. As proposed
Gross area: same as proposed As proposed
U-factor: as specified in Table N1102.1.4 As proposed
Solar absorptance = 0.75 As proposed
Emittance = 0.90 As proposed
Basement and crawl space walls Type: same as proposed As proposed
Gross area: same as proposed As proposed
U-factor: from Table N1102.1.4, with insulation layer on interior side of walls As proposed
Above-grade floors Type: wood frame As proposed
Gross area: same as proposed As proposed
U-factor: as specified in Table N1102.1.4 As proposed
Ceilings Type: wood frame As proposed
Gross area: same as proposed As proposed
U-factor: as specified in Table N1102.1.4 As proposed
Roofs Type: composition shingle on wood sheathing As proposed
Gross area: same as proposed As proposed
Solar absorptance = 0.75 As proposed
Emittance = 0.90 As proposed
Attics Type: vented with aperture = 1 ft2 per 300 ft2 ceiling area As proposed
Foundations Type: same as proposed As proposed
Foundation wall area above and below grade and soil characteristics: same as
proposed
As proposed
Opaque doors Area: 40 ft2 As proposed
Orientation: North As proposed
U-factor: same as fenestration from Table N1102.1.4 As proposed
Vertical fenestration
other than opaque doors
Total areah = As proposed
(a) The proposed glazing area, where the proposed glazing area is less than 15
percent of the conditioned floor area
(b) 15 percent of the conditioned floor area, where the proposed glazing area is
15 percent or more of the conditioned floor area
Orientation: equally distributed to four cardinal compass orientations
(N, E, S & W).
As proposed
U-factor: as specified in Table N1102.1.4 As proposed
SHGC: as specified in Table N1102.1.2 except that for climates with no requirement
(NR) SHGC = 0.40 shall be used.
As proposed
Interior shade fraction: 0.92-(0.21 × SHGC for the standard reference design) 0.92-(0.21 × SHGC as proposed)
External shading: none As proposed
Skylights None As proposed
Thermally isolated
sunrooms
None As proposed
Air exchange rate Air leakage rate of 5 air changes per hour in Climate Zones 1 and 2, and 3 air changes per hour in Climate Zones 3 through 85 at a pressure of 0.2 inches w.g (50 Pa). The mechanical ventilation rate shall be in addition to the air leakage rate and the same as in the proposed design, but no greater than 0.01 × CFA + 7.5 × (Nbr + 1)
where:
CFA = conditioned floor area
Nbr = number of bedrooms
Energy recovery shall not be assumed for mechanical ventilation.
For residences that are not
tested, the same air leakage rate
as the standard reference design.
For tested residences, the measured
air exchange ratea.
The mechanical ventilation rateb
shall be in addition to the air
leakage rate and shall be as proposed.


(continued)

TABLE N1105.5.2(1) [R405.5.2(1)]—continued
SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS
BUILDING COMPONENT STANDARD REFERENCE DESIGN PROPOSED DESIGN
Mechanical ventilation None, except where mechanical ventilation is specified by the proposed
design, in which case:
Annual vent fan energy use:
kWh/yr = 0.03942 × CFA + 29.565 × (Nbr +1)
where:
CFA = conditioned floor area
Nbr = number of bedrooms
As proposed
Internal gains IGain = 17,900 + 23.8 × CFA + 4104 × Nbr (Btu/day per dwelling unit) Same as standard reference design.
Internal mass An internal mass for furniture and contents of 8 pounds per square foot of
floor area.
Same as standard reference design,
plus any additional mass specifically
designed as a thermal storage
elementc but not integral to the
building envelope or structure.
Structural mass For masonry floor slabs, 80 percent of floor area covered by R-2 carpet and
pad, and 20 percent of floor directly exposed to room air.
As proposed
For masonry basement walls, as proposed, but with insulation required by
Table N1102.1.4 located on the interior side of the walls
As proposed
For other walls, for ceilings, floors, and interior walls, wood frame
construction
As proposed
Heating systemsd, e As proposed for other than electric heating without a heat pump, where the
proposed design utilizes electric heating without a heat pump the standard
reference design shall be an air source heat pump meeting the requirements
of Section C403 of the IECC-Commercial Provisions.
Capacity: sized in accordance with Section N1103.7
As proposed
Cooling systemsd, f As proposed
Capacity: sized in accordance with Section N1103.7.
As proposed
Service water heatingd, e, f,g As proposed
Use: same as proposed design
As proposed
gal/day = 30 + (10 × Nbr)
Thermal distribution
systems
Duct insulation: From Section N1103.3.1
A thermal distribution system efficiency (DSE) of 0.88 shall be applied to
both the heating and cooling system efficiencies for all systems other than
tested duct systems. For tested duct systems, the leakage rate shall be 4 cfm
(113.3 L/min) per 100 ft2 (9.29 m2) of conditioned floor area at a pressure
of differential of 0.1 inches w.g. (25 Pa).
As tested or as specified in Table N1105.5.2(2) if not tested. Duct insulation shall be as proposedthe same as standard reference design.
Thermostat Type: Manual, cooling temperature setpoint = 75°F;
Heating temperature setpoint = 72°F
Same as standard reference

For SI: 1 square foot = 0.93 m2, 1 British thermal unit = 1055 J, 1 pound per square foot = 4.88 kg/m2, 1 gallon (US) = 3.785 L, °C = (°F-32)/1.8, 1 degree = 0.79 rad.
a. Where required by the code official, testing shall be conducted by an approved party. Hourly calculations as specified in the ASHRAE Handbook of Fundamentals, or the equivalent shall be used to determine the energy loads resulting from infiltration.
b. The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with Equation 43 of 2001 ASHRAE Handbook of Fundamentals, page 26.24 and the "Whole-house Ventilation" provisions of 2001 ASHRAE Handbook of Fundamentals, page 26.19 for intermittent mechanical ventilation.
c. Thermal storage element shall mean a component not part of the floors, walls or ceilings that is part of a passive solar system, and that provides thermal storage such as enclosed water columns, rock beds, or phase-change containers. A thermal storage element must be in the same room as fenestration that faces within 15 degrees (0.26 rad) of true south, or must be connected to such a room with pipes or ducts that allow the element to be actively charged.
d. For a proposed design with multiple heating, cooling or water heating systems using different fuel types, the applicable standard reference design system capacities and fuel types shall be weighted in accordance with their respective loads as calculated by accepted engineering practice for each equipment and fuel type present.
e. For a proposed design without a proposed heating system, a heating system with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and proposed design.
f. For a proposed design home without a proposed cooling system, an electric air conditioner with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and the proposed design.
g. For a proposed design with a nonstorage-type water heater, a 40-gallon storage-type water heater with the prevailing federal minimum energy factor for the same fuel as the predominant heating fuel type shall be assumed. For the case of a proposed design without a proposed water heater, a 40-gallon storage-type water heater with the prevailing federal minimum efficiency for the same fuel as the predominant heating fuel type shall be assumed for both the proposed design and standard reference design.
h. For residences with conditioned basements, R-2 and R-4 residences and townhouses, the following formula shall be used to determine glazing area:
AF = As × FA × F
where:
AF = Total glazing area.
As = Standard reference design total glazing area.
FA = (Above-grade thermal boundary gross wall area)/(above-grade boundary wall area + 0.5 × below-grade boundary wall area).
F = (Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area + common wall area) or 0.56, whichever is greater.
and where:
Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient conditions.
Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil.
Below-grade boundary wall is any thermal boundary wall in soil contact.
Common wall area is the area of walls shared with an adjoining dwelling unit.
L and CFA are in the same units.


TABLE N1105.5.2(2) [R405.5.2(2)]
DEFAULT DISTRIBUTION SYSTEM EFFICIENCIES FOR PROPOSED DESIGNSa
DISTRIBUTION SYSTEM CONFIGURATION AND CONDITION FORCED AIR SYSTEMS HYDRONIC SYSTEMSb
Distribution system components located in unconditioned space 0.95
Untested distribution systems entirely located in conditioned spacec 0.88 1
"Ductless" systemsd 1

For SI: 1 cubic foot per minute = 0.47 L/s, 1 square foot = 0.093m2, 1 pound per square inch = 6895 Pa, 1 inch water gauge = 1250 Pa.
a. Default values given by this table are for untested distribution systems, which must still meet minimum requirements for duct system insulation.
b. Hydronic systems shall mean those systems that distribute heating and cooling energy directly to individual spaces using liquids pumped through closed-loop piping and that do not depend on ducted, forced airflow to maintain space temperatures.
c. Entire system in conditioned space shall mean that no component of the distribution system, including the air handler unit, is located outside of the conditioned space.
d. Ductless systems shall be allowed to have forced airflow across a coil but shall not have any ducted airflow external to the manufacturer's air handler enclosure.
Calculation software, where used, shall be in accordance with Sections N1105.6.1 through N1105.6.3.
Calculation procedures used to comply with this section shall be software tools capable of calculating the annual energy consumption of all building elements that differ between the standard reference design and the proposed design and shall include the following capabilities:

1. Computer generation of the standard reference design using only the input for the proposed design. The calculation procedure shall not allow the user to directly modify the building component characteristics of the standard reference design.

2. Calculation of whole-building (as a single zone) sizing for the heating and cooling equipment in the standard reference design residence in accordance with Section N1103.6.

3. Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.

4. Printed building official inspection checklist listing each of the proposed design component characteristics from Table N1105.5.2(1) determined by the analysis to provide compliance, along with their respective performance ratings (R-value, U-factor, SHGC, HSPF, AFUE, SEER, EF are some examples).
Performance analysis tools meeting the applicable provisions of Section N1105 shall be permitted to be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The building official shall be permitted to approve tools for a specified application or limited scope.
When calculations require input values not specified by Sections N1102, N1103, N1104 and N1105, those input values shall be taken from an approved source.
This section establishes criteria for compliance using an Energy Rating Index (ERI) analysis.

N1106.2 (R406.2) Mandatory Requirements

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Compliance with this section requires that the mandatory provisions identified in Sections N1101.13 N1101 through N1104 identified labeled as "mandatory" and Section N1103.5.3 be met. The building thermal envelope shall be greater than or equal to levels of efficiency and Solar Heat Gain Coefficient in Table 402.1.1 or 402.1.3 1102.1.1 or 1102.1.3 of the 2009 International Energy Conservation Code 2012 NC Energy Conservation Code. Minimum standards associated with compliance shall be the ANSI RESNET ICC Standard 301-2014 “Standard for the Calculation and Labeling of the Energy Performance of Low-Rise Residential Buildings using an Energy Rating Index.” A North Carolina licensed design professional or certified HERS rater is required to perform the analysis if required by North Carolina licensure laws.

Exception: Supply and return ducts not completely inside the building thermal envelope shall be insulated to a minimum of R-6.Supply and return ducts in unconditioned space and outdoors shall be insulated to a minimum R-8. Supply ducts inside semi-conditioned space shall be insulated to a minimum R-4; return ducts inside conditioned and semi-conditioned space are not required to be insulated. Ducts located inside conditioned space are not required to be insulated other than as may be necessary for preventing the formation of condensation on the exterior of cooling ducts.
The Energy Rating Index (ERI) shall be a numerical integer value that is based on a linear scale constructed such that the ERI reference design has an Index value of 100 and a residential building that uses no net purchased energy has an Index value of 0. Each integer value on the scale shall represent a 1 percent change in the total energy use of the rated design relative to the total energy use of the ERI reference design. The ERI shall consider all energy used in the residential building.
The ERI reference design shall be configured such that it meets the minimum requirements of the 2006 International Energy Conservation Code prescriptive requirements.

The proposed residential building shall be shown to have an annual total normalized modified load less than or equal to the annual total loads of the ERI reference design.

N1106.4 (R406.4) ERI-based Compliance

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Compliance based on an ERI analysis requires that the rated design be shown to have an ERI less than or equal to the appropriate value listed in Table N1106.4N1106.4.1 or Table N1106.4.2, as applicable, when compared to the ERI reference design.

TABLE N1106.4 (R406.4) MAXIMUM ENERGY RATING INDEX

CLIMATE ZONE ENERGY RATING INDEX
1 52
2 52
3 51
4 54
5 55
6 54
7 53
8 53
TABLE N1106.4.1 (R406.4.1)
MAXIMUM ENERGY RATING INDEX (without calculation of on-site renewable energy)
CLIMATE ZONE JAN. 1, 2019 –
DEC. 31, 2022
JAN. 1, 2023
AND FORWARD
3 65 61
4 67 63
5 67 63


TABLE N1106.4.2 (R406.4.2)
MAXIMUM ENERGY RATING INDEX (without calculation of on-site renewable energy)
CLIMATE ZONE JAN. 1, 2019 –
DEC. 31, 2022
JAN. 1, 2023
AND FORWARD
3 51 47
4 54 50
5 55 51

N1106.5 (R406.5) Verification by Approved Agency

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Verification of compliance with Section N1106 shall be completed by an approved third partyperformed by the licensed design professional or certified HERS rater and the compliance documentation shall be provided to the code official. The code official shall inspect according to the requirements of Section N1106.6.2.
Documentation of the software used to determine the ERI and the parameters for the residential building shall be in accordance with Sections N1106.6.1 through N1106.6.3.

N1106.6.1 (R406.6.1) Compliance Software Tools

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Documentation verifying that the methods and accuracy of the compliance software tools conform to the provisions of this section shall be provided to the code official. Compliance software tools for this section shall be in compliance with ANSI/RESNET/ICC 301—2014.

N1106.6.2 (R406.6.2) Compliance Report

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Compliance software tools shall generate a report that documents that the ERI of the rated design complies with Sections N1106.3 and N1106.4. The compliance documentation shall include the following information:
  1. Address or other identification of the residential building.
  2. An inspection checklist documenting the building component characteristics of the rated design. The inspection checklist shall show results for both the ERI reference design and the rated design, and shall document all inputs entered by the user necessary to reproduce the results.
  3. Name of individual completing the compliance report.
  4. Name and version of the compliance software tool.


Exception: Multiple orientations. Where an otherwise identical building model is offered in multiple orientations, compliance for any orientation shall be permitted by documenting that the building meets the performance requirements in each of the four (north, east, south and west) cardinal orientations.

N1106.6.3 (R406.6.3) Additional Documentation

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
The code official shall be permitted to require the following documents:

1. Documentation of the building component characteristics of the ERI reference design.

2. A certification signed by the builder providing the building component characteristics of the rated design.

3. Documentation of the actual values used in the software calculations for the rated design.
Calculation software, where used, shall be in accordance with Sections N1106.7.1 through N1106.7.3.

N1106.7.1 R(406.7.1) Minimum Capabilities

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Calculation procedures used to comply with this section shall be software tools capable of calculating the ERI as described in Section N1106.3 and shall be in compliance with ANSI/RESNET/ICC 301, and the software shall include the following capabilities:
  1. Computer generation of the ERI reference design using only the input for the rated design.

         The calculation procedure shall not allow the user to directly modify the building component characteristics of the ERI reference design.
  2. Calculation of whole-building, as a single zone, sizing for the heating and cooling equipment in the ERI reference design residence in accordance with Section N1103.7.
  3. Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.
  4. Printed code official inspection checklist listing each of the rated design component characteristics determined by the analysis to provide compliance, along with their respective performance ratings.

N1106.7.2 (406.7.2) Specific Approval

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Performance analysis tools meeting the applicable sections of Section N1106 shall be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The code official shall approve tools for a specified application or limited scope.

N1106.7.3 (R406.7.3) Input Values

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
When calculations require input values not specified by Sections N1102, N1103, N1104 and N1105, those input values shall be taken from an approved source.
The provisions of Sections N1107 through N1111 shall control the alteration, repair, addition and change of occupancy of existing buildings and structures.
Additions, alterations, or repairs to an existing building, building system or portion thereof shall comply with Section N1108, N1109 or N1110. Unaltered portions of the existing building or building supply system shall not be required to comply with this chapter.
Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.

N1107.3 (R501.3) Maintenance

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Buildings and structures, and parts thereof, shall be maintained in a safe and sanitary condition. Devices and systems that are required by this code shall be maintained in conformance with the code edition under which installed. The owner or the owner's authorized agent shall be responsible for the maintenance of buildings and structures. The requirements of this chapter shall not provide the basis for removal or abrogation of energy conservation, fire protection and safety systems and devices in existing structures.

N1107.4 (R501.4) Compliance

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in this code and the International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, International Plumbing Code, North Carolina Existing Building Code and NFPA 70.
Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs, provided no hazard to life, health or property is created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.

N1107.6 (R501.6) Historic Buildings

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
No provision of this chapter relating to the construction, repair, alteration, restoration and movement of structures, and change of occupancy shall be mandatory for historic buildings provided a report has been submitted to the code official and signed by the owner, a registered design professional, or a representative of the State Historic Preservation Office or the historic preservation authority having jurisdiction, demonstrating that compliance with that provision would threaten, degrade or destroy the historic form, fabric or function of the building.
Additions to an existing building, building system or portion thereof shall conform to the provisions of this chapter as they relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this chapter. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this chapter where the addition alone complies, where the existing building and addition comply with this chapter as a single building, or where the building with the addition uses no more energy than the existing building. Additions shall be in accordance with Section N1108.1.1 or N1108.1.2.

N1108.1.1.1 (R502.1.1.1) Building Envelope

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
New building thermal envelope assemblies that are part of the addition shall comply with Sections N1102.1, N1102.2, N1102.3.1 through N1102.3.5, and N1102.4.

Exception: Where nonconditioned space is changed to conditioned space, the building envelope of the addition shall comply where the UA, as determined in Section N1102.1.5, of the existing building and the addition, and any alterations that are part of the project, is less than or equal to UA generated for the existing building.

N1108.1.1.2 (R502.1.1.2) Heating and Cooling Systems

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
New heating, cooling and duct systems that are part of the addition shall comply with Sections N1103.1, N1103.2, N1103.3, N1103.5N1103.4 and N1103.6. New heating and cooling appliances shall be sized in accordance with Section N1103.7. Extensions of ducts from an existing system to a new addition shall require that the existing system be evaluated for the new design.

Exception: Where ducts from an existing heating and cooling system are extended to an addition, duct systems with less than 40 linear feet (12.19 m) in unconditioned spaces shall not be required to be tested in accordance with Section N1103.3.3. Installation of an addition to an existing duct system shall not require a duct leakage test.
New service hot water systems that are part of the addition shall comply with Section N1103.5.
New lighting systems that are part of the addition shall comply with Section N1104.1.

N1108.1.2 (R502.1.2) Existing Plus Addition Compliance (Simulated performance alternative for additions)

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Where nonconditioned space is changed to conditioned space, the addition shall comply where the annual energy cost or energy use of the addition and the existing building, and any alterations that are part of the project, is less than or equal to the annual energy cost of the existing building when modeled in accordance with Section N1105. The addition and any alterations that are part of the project shall comply with Section N1105, as applicable in its entirety.

N1109.1 (R503.1) General

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Alterations to any building or structure shall comply with the requirements of the code for new construction. Alterations shall be such that the existing building or structure is no less conforming with the provisions of this chapter than the existing building or structure was prior to the alteration.

Alterations to an existing building, building system or portion thereof shall conform to the provisions of this chapter as they relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this chapter. Alterations shall not create an unsafe or hazardous condition or overload existing building systems. Alterations shall be such that the existing building or structure uses no more energy than the existing building or structure prior to the alteration. Alterations to existing buildings shall comply with Sections N1109.1.1 through N1109.2.

N1109.1.1 (R503.1.1) Building Envelope

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Building envelope assemblies that are part of the alteration shall comply with Section N1102.1.2 or N1102.1.4, Sections N1102.2.1 through N1102.2.13N1102.2.15, N1102.3.1, N1102.3.2, N1102.4.3N1102.4.4 and N1102.4.5N1102.4.6.

Exception: The following alterations to conditioned spaces need not comply with the requirements for new construction provided the energy use of the building is not increased:
  1. Storm windows installed over existing fenestration.
  2. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with insulation. Roof systems requiring air space for ventilation shall retain the ventilation space required.
  3. Construction where the existing roof, wall or floor cavity is not exposed.
  4. Roof recover and roof replacement such that the existing building or structure is no less conforming to the provisions of this code than the existing building or structure was prior to the alteration..
  5. Deleted.
  6. Roofs without insulation in the cavity and where the sheathing or insulation is exposed during reroofing shall be insulated either above or below the sheathing. Surface applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain.
  7. Surface applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing or fenestration assembly to be replaced. Converting unconditioned attic space to conditioned attic space for one- and two-family dwellings and townhouses. Ceilings shall be insulated to a minimum of R-30, walls shall be insulated to the exterior wall requirements in Table N1102.1.2 or Table N1102.1.4 and follow the backing requirements in Sections N1102.2.14 and N1102.2.15.

N1109.1.1.1 (R503.1.1.1) Replacement Fenestration

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Where some or all of anWhere an entire existing fenestration unit is replaced with a new fenestration product, including frame, sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC as provided in Table N1102.1.2.

Exception: Alterations that replace less than 50 percent of entire fenestration units may be replaced with like or better fenestration units to match existing fenestration assemblies.

N1109.1.2 (R503.1.2) Heating and Cooling Systems

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
New heating, cooling and duct systems that are part of the alteration shall comply with Sections N1103.1, N1103.2, N1103.3, N1103.4, and N1103.6 and N1103.7.

Exception: Where ducts from an existing heating and cooling system are extended, duct systems with less than 40 linear feet (12.19 m) in unconditioned spaces shall not be required to be tested in accordance with Section N1103.3.3. An alteration involving a partial system replacement to an existing duct system shall not require a duct leakage test.
New service hot water systems that are part of the alteration shall comply with Section N1103.5.
New lighting systems that are part of the alteration shall comply with Section N1104.1.

Exception: Alterations that replace less than 50 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.

N1109.2 (R503.2) Change in Space Conditioning

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Any nonconditioned or low energy space that is altered to become conditioned space shall be required to be brought into full compliance with this chapter.

Exception: Where the simulated performance option in Section N1105 is used to comply with this section, the annual energy cost of the proposed design is permitted to be 110 percent of the annual energy cost otherwise allowed by Section N1105.3.
In addition to the requirements of Section N1109.1, projects changing unconditioned space to conditioned space and costing more than $10,000 shall require 10 percent of the project cost to be used toward meeting the requirements of this chapter. Project costs for the purpose of this section is the total project cost listed on all permits related to the work required to convert the unconditioned space to conditioned space and excludes the 10 percent added from this section. Under this section, existing building envelope elements that become a part of the building thermal envelope and are not changed are not required to be upgraded. The additional 10 percent of the project cost shall be appropriated for additional energy conservation features of choice that are addressed in this chapter. In addition to the 10-percent project cost, any existing wall, ceiling, or floor cavities that are exposed during construction shall at a minimum be insulated to comply with this chapter or be insulated to fill the cavity, whichever is less. Roof systems requiring air space for ventilation shall retain the ventilation space required. Projects costing less than $10,000 are not subject to the 10-percent project cost addition provision.

N1110.1 (R504.1) General

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Buildings, structures and parts thereof shall be repaired in compliance with Section N1107.3 and this section. Repair of the building systems shall not make the building less conforming than it was before the repair was undertaken. Work on nondamaged components necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter. Routine maintenance required by Section N1107.3, ordinary repairs exempt from permit, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.

N1110.2 (R504.2) Application Materials

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
For the purposes of this code, the following shall be considered repairs:

1. Glass-only replacements in an existing sash and frame.

2. Roof repairs.

3. Repairs where only the bulb and/or ballast within the existing luminaires in a space are replaced provided that the replacement does not increase the installed interior lighting power.
Portions of walls that are part of the building thermal envelope shall be insulated in accordance with this code when the repair requires the removal of either the interior or exterior wall membrane such that the wall cavity is exposed during the repair.

Exception: Wall cavities containing existing insulation material.

N1110.3 (R504.3) Glazing

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Repairs requiring the replacement of individual glass panes or sashes shall not require compliance with this code.

N1111.1 (R505.1) General

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Alterations performed in spaces undergoing a change in occupancy that would result in an increase in demand for either fossil fuel or electrical energy shallshall comply with the requirements of this code. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.

N1111.2 (R505.2) General

AMENDMENT
This section has been amended at the state or city level. Amendments are shown in green text.
Any space that is converted to a dwelling unit or portion thereof from another use or occupancy shall comply with this code.

Exception: Where the simulated performance option in Section N1105 is used to comply with this section, the annual energy cost of the proposed design is permitted to be 110 percent of the annual energy cost otherwise allowed by Section N1105.3.
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