ADOPTS WITHOUT AMENDMENTS:

International Residential Code 2021 (IRC 2021)

Part I Administrative

Part II Definitions

Heads up: There are no amended sections in this chapter.
User note:
About this chapter: The purpose of Chapter 11 [RE] is to provide minimum design requirements that will promote efficient utilization of energy in buildings. The requirements are directed toward the design of building envelopes with adequate thermal resistance and low air leakage, and toward the design and selection of mechanical, water heating, electrical and illumination systems that promote effective use of depletable energy resources.

This chapter regulates the energy efficiency for the design and construction of buildings regulated by this code.

Note: The text of Sections N1101.2 through N1113 parallels the text of the 2021 edition of the International Energy Conservation Code—Residential Provisions (IECC-R). The section numbers appearing in parenthesis after each section number are the section numbers of the corresponding text in the IECC-R. If a section does not have a section number in parenthesis after it, then there is no corresponding text in the IECC-R.

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 code official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this chapter.
The code 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 to be in compliance with this code. The requirements identified in Table N1105.2, as applicable, shall be met and the building thermal envelope is greater than or equal to levels of efficiency and solar heat gain coefficients (SHGC) in Tables 402.1.1 and 402.1.3 of the 2009 International Energy Conservation Code.

Construction documents shall be drawn to scale on suitable material. Electronic media documents are permitted to be submitted when approved by the code 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 the following as applicable:

  1. Energy compliance path.
  2. Insulation materials and their R-values.
  3. Fenestration U-factors and solar heat gain coefficients (SHGC).
  4. Area-weighted U-factor and solar heat gain coefficient (SHGC) calculations.
  5. Mechanical system design criteria.
  6. Mechanical and service water heating systems and equipment types, sizes and efficiencies.
  7. Equipment and system controls.
  8. Duct sealing, duct and pipe insulation and location.
  9. Air sealing details.
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.

ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel or similar obstruction.

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

AIR BARRIER. One or more materials joined together in a continuous manner to restrict or prevent the passage of air through the building thermal envelope and its assemblies.

ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition. 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.

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 contiguous area of land that is under the ownership or control of one entity.

BUILDING THERMAL ENVELOPE. The basement walls, exterior walls, floors, ceilings, roofs and any other building element assemblies that enclose conditioned space or provide a boundary between conditioned space and exempt or unconditioned space.

CAVITY INSULATION. Insulating material located between framing members.

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 one or more pumps prime the service hot water piping with heated water on demand for hot water.

DIMMER. A control device that is capable of continuously varying the light output and energy use of light sources.

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.

DWELLING UNIT. A single unit providing complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.

DWELLING UNIT ENCLOSURE AREA. The sum of the area of ceiling, floors and walls separating a dwelling unit's conditioned space from the exterior or from adjacent conditioned or unconditioned spaces. Wall height shall be measured from the finished floor of the dwelling unit to the underside of the floor above.

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.

Skylights. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (1.05 rad) from horizontal, including unit skylights, tubular daylighting devices, and glazing materials in solariums, sunrooms, roofs and sloped walls.

Vertical fenestration. Windows that are fixed or operable, 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 not less than 60 degrees (1.05 rad) from horizontal.

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.

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 LIGHT SOURCES. Any lamp with an efficacy of not less than 65 lumens per watt, or luminaires with an efficacy of not less than 45 lumens per watt.

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

  1. Listed, or certified as eligible for listing 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 district.

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 an R-value of not less than R-2.

INSULATING SHEATHING. An insulating board with a core material having an R-value of not less than R-2.

LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, approved agency or other organization concerned with product evaluation that maintains periodic inspection of the production of such labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.

LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and where the listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.

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

OCCUPANT SENSOR CONTROL. An automatic control device that detects the presence or absence of people within an area and causes lighting, equipment or appliances to be regulated accordingly.

ON-SITE RENEWABLE ENERGY. Energy from renewable energy resources harvested at the building site.

OPAQUE DOOR. A door that is not less than 50-percent opaque in surface area.

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.

READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached without requiring the removal or movement of any panel or similar obstruction.

RENEWABLE ENERGY CERTIFICATE (REC). An instrument that represents the environmental attributes of one megawatt hour of renewable energy; also known as an energy attribute certificate (EAC).

RENEWABLE ENERGY RESOURCES. Energy derived from solar radiation, wind, waves, tides, landfill gas, biogas, biomass or extracted from hot fluid or steam heated within the earth.

REPAIR. The reconstruction or renewal of any part of an existing building for the purpose of its maintenance or to correct damage.

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 townhouses as well as Group R-2, R-3 and R-4 buildings three stories or less in height above grade plane.

ROOF ASSEMBLY. A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as both the roof covering and the roof deck. A roof assembly includes the roof covering, underlayment, and roof deck, and can also include a thermal barrier, ignition barrier, insulation or a vapor retarder.

ROOF RECOVER. The process of installing an additional roof covering over an 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.

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 DISTRIBUTION EFFICIENCY (TDE). The resistance to changes in air heat as air is conveyed through a distance of air duct. TDE is a heat-loss calculation evaluating the difference in the heat of the air between the air duct inlet and outlet caused by differences in temperatures between the air in the duct and the duct material. TDE is expressed as a percent difference between the inlet and outlet heat in the duct.

THERMAL ISOLATION. Physical and space conditioning separation from conditioned spaces. The conditioned spaces 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. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing such air from, any space.

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.

Climate zones from Figure N1101.7 or Table N1101.7 shall be used for determining the applicable requirements in Sections N1101 through N1113. Locations not indicated in Table N1101.7 shall be assigned a climate zone in accordance with Section N1101.7.2.



FIGURE N1101.7 (R301.1)

CLIMATE ZONES


TABLE N1101.7 (R301.1)

CLIMATE ZONES, MOISTURE REGIMES, AND WARM HUMID DESIGNATIONS BY STATE, COUNTY AND TERRITORYa
US STATES

ALABAMA

3A Autauga*

2A Baldwin*

3A Barbour*

3A Bibb

3A Blount

3A Bullock*

3A Butler*

3A Calhoun

3A Chambers

3A Cherokee

3A Chilton

3A Choctaw*

3A Clarke*

3A Clay

3A Cleburne

2A Coffee*

3A Colbert

3A Conecuh*

3A Coosa

2A Covington*

3A Crenshaw*

3A Cullman

2A Dale*

3A Dallas*

3A DeKalb

3A Elmore*

2A Escambia*

3A Etowah

3A Fayette

3A Franklin

2A Geneva*

3A Greene

3A Hale

2A Henry*

2A Houston*

3A Jackson

3A Jefferson

3A Lamar

3A Lauderdale

3A Lawrence

3A Lee

3A Limestone

3A Lowndes*

3A Macon*

3A Madison

3A Marengo*

3A Marion

3A Marshall

2A Mobile*

3A Monroe*

3A Montgomery*

3A Morgan

3A Perry*

3A Pickens

3A Pike*

3A Randolph

3A Russell*

3A Shelby

3A St. Clair

3A Sumter

3A Talladega

3A Tallapoosa

3A Tuscaloosa

3A Walker

3A Washington*

3A Wilcox*

3A Winston

ALASKA

7 Aleutians East

7 Aleutians West

7 Anchorage

7 Bethel

7 Bristol Bay

8 Denali

7 Dillingham

8 Fairbanks North Star

6A Haines

6A Juneau

7 Kenai Peninsula

5C Ketchikan Gateway

6A Kodiak Island

7 Lake and Peninsula

7 Matanuska-Susitna

8 Nome

8 North Slope

8 Northwest Arctic

5C Prince of Wales-Outer Ketchikan

5C Sitka

6A Skagway-Hoonah-Angoon

8 Southeast Fairbanks

7 Valdez-Cordova

8 Wade Hampton

6A Wrangell-Petersburg

7 Yakutat

8 Yukon-Koyukuk

ARIZONA

5B Apache

3B Cochise

5B Coconino

4B Gila

3B Graham

3B Greenlee

2B La Paz

2B Maricopa

3B Mohave

5B Navajo

2B Pima

2B Pinal

3B Santa Cruz

4B Yavapai

2B Yuma

ARKANSAS

3A Arkansas

3A Ashley

4A Baxter

4A Benton

4A Boone

3A Bradley

3A Calhoun

4A Carroll

3A Chicot

3A Clark

3A Clay

3A Cleburne

3A Cleveland

3A Columbia*

3A Conway

3A Craighead

3A Crawford

3A Crittenden

3A Cross

3A Dallas

3A Desha

3A Drew

3A Faulkner

3A Franklin

4A Fulton

3A Garland

3A Grant

3A Greene

3A Hempstead*

3A Hot Spring

3A Howard

3A Independence

4A Izard

3A Jackson

3A Jefferson

3A Johnson

3A Lafayette*

3A Lawrence

3A Lee

3A Lincoln

3A Little River*

3A Logan

3A Lonoke

4A Madison

4A Marion

3A Miller*

3A Mississippi

3A Monroe

3A Montgomery

3A Nevada

4A Newton

3A Ouachita

3A Perry

3A Phillips

3A Pike

3A Poinsett

3A Polk

3A Pope

3A Prairie

3A Pulaski

3A Randolph

3A Saline

3A Scott

4A Searcy

3A Sebastian

3A Sevier*

3A Sharp

3A St. Francis

4A Stone

3A Union*

3A Van Buren

4A Washington

3A White

3A Woodruff

3A Yell

CALIFORNIA

3C Alameda

6B Alpine

4B Amador

3B Butte

4B Calaveras

3B Colusa

3B Contra Costa

4C Del Norte

4B El Dorado

3B Fresno

3B Glenn

4C Humboldt

2B Imperial

4B Inyo

3B Kern

3B Kings

4B Lake

5B Lassen

3B Los Angeles

3B Madera

3C Marin

4B Mariposa

3C Mendocino

3B Merced

5B Modoc

6B Mono

3C Monterey

3C Napa

5B Nevada

3B Orange

3B Placer

5B Plumas

3B Riverside

3B Sacramento

3C San Benito

3B San Bernardino

3B San Diego

3C San Francisco

3B San Joaquin

3C San Luis Obispo

3C San Mateo

3C Santa Barbara

3C Santa Clara

3C Santa Cruz

3B Shasta

5B Sierra

5B Siskiyou

3B Solano

3C Sonoma

3B Stanislaus

3B Sutter

3B Tehama

4B Trinity

3B Tulare

4B Tuolumne

3C Ventura

3B Yolo

3B Yuba

COLORADO

5B Adams

6B Alamosa

5B Arapahoe

6B Archuleta

4B Baca

4B Bent

5B Boulder

5B Broomfield

6B Chaffee

5B Cheyenne

7 Clear Creek

6B Conejos

6B Costilla

5B Crowley

5B Custer

5B Delta

5B Denver

6B Dolores

5B Douglas

6B Eagle

5B Elbert

5B El Paso

5B Fremont

5B Garfield

5B Gilpin

7 Grand

7 Gunnison

7 Hinsdale

5B Huerfano

7 Jackson

5B Jefferson

5B Kiowa

5B Kit Carson

7 Lake

5B La Plata

5B Larimer

4B Las Animas

5B Lincoln

5B Logan

5B Mesa

7 Mineral

6B Moffat

5B Montezuma

5B Montrose

5B Morgan

4B Otero

6B Ouray

7 Park

5B Phillips

7 Pitkin

4B Prowers

5B Pueblo

6B Rio Blanco

7 Rio Grande

7 Routt

6B Saguache

7 San Juan

6B San Miguel

5B Sedgwick

7 Summit

5B Teller

5B Washington

5B Weld

5B Yuma

CONNECTICUT

5A (all)

DELAWARE

4A (all)

DISTRICT OF COLUMBIA

4A (all)

FLORIDA

2A Alachua*

2A Baker*

2A Bay*

2A Bradford*

2A Brevard*

1A Broward*

2A Calhoun*

2A Charlotte*

2A Citrus*

2A Clay*

2A Collier*

2A Columbia*

2A DeSoto*

2A Dixie*

2A Duval*

2A Escambia*

2A Flagler*

2A Franklin*

2A Gadsden*

2A Gilchrist*

2A Glades*

2A Gulf*

2A Hamilton*

2A Hardee*

2A Hendry*

2A Hernando*

2A Highlands*

2A Hillsborough*

2A Holmes*

2A Indian River*

2A Jackson*

2A Jefferson*

2A Lafayette*

2A Lake*

2A Lee*

2A Leon*

2A Levy*

2A Liberty*

2A Madison*

2A Manatee*

2A Marion*

2A Martin*

1A Miami-Dade*

1A Monroe*

2A Nassau*

2A Okaloosa*

2A Okeechobee*

2A Orange*

2A Osceola*

1A Palm Beach*

2A Pasco*

2A Pinellas*

2A Polk*

2A Putnam*

2A Santa Rosa*

2A Sarasota*

2A Seminole*

2A St. Johns*

2A St. Lucie*

2A Sumter*

2A Suwannee*

2A Taylor*

2A Union*

2A Volusia*

2A Wakulla*

2A Walton*

2A Washington*

GEORGIA

2A Appling*

2A Atkinson*

2A Bacon*

2A Baker*

3A Baldwin

3A Banks

3A Barrow

3A Bartow

3A Ben Hill*

2A Berrien*

3A Bibb

3A Bleckley*

2A Brantley*

2A Brooks*

2A Bryan*

3A Bulloch*

3A Burke

3A Butts

2A Calhoun*

2A Camden*

3A Candler*

3A Carroll

3A Catoosa

2A Charlton*

2A Chatham*

3A Chattahoochee*

3A Chattooga

3A Cherokee

3A Clarke

3A Clay*

3A Clayton

2A Clinch*

3A Cobb

2A Coffee*

2A Colquitt*

3A Columbia

2A Cook*

3A Coweta

3A Crawford

3A Crisp*

3A Dade

3A Dawson

2A Decatur*

3A DeKalb

3A Dodge*

3A Dooly*

2A Dougherty*

3A Douglas

2A Early*

2A Echols*

2A Effingham*

3A Elbert

3A Emanuel*

2A Evans*

3A Fannin

3A Fayette

3A Floyd

3A Forsyth

3A Franklin

3A Fulton

3A Gilmer

3A Glascock

2A Glynn*

3A Gordon

2A Grady*

3A Greene

3A Gwinnett

3A Habersham

3A Hall

3A Hancock

3A Haralson

3A Harris

3A Hart

3A Heard

3A Henry

3A Houston*

3A Irwin*

3A Jackson

3A Jasper

2A Jeff Davis*

3A Jefferson

3A Jenkins*

3A Johnson*

3A Jones

3A Lamar

2A Lanier*

3A Laurens*

3A Lee*

2A Liberty*

3A Lincoln

2A Long*

2A Lowndes*

3A Lumpkin

3A Macon*

3A Madison

3A Marion*

3A McDuffie

2A McIntosh*

3A Meriwether

2A Miller*

2A Mitchell*

3A Monroe

3A Montgomery*

3A Morgan

3A Murray

3A Muscogee

3A Newton

3A Oconee

3A Oglethorpe

3A Paulding

3A Peach*

3A Pickens

2A Pierce*

3A Pike

3A Polk

3A Pulaski*

3A Putnam

3A Quitman*

3A Rabun

3A Randolph*

3A Richmond

3A Rockdale

3A Schley*

3A Screven*

2A Seminole*

3A Spalding

3A Stephens

3A Stewart*

3A Sumter*

3A Talbot

3A Taliaferro

2A Tattnall*

3A Taylor*

3A Telfair*

3A Terrell*

2A Thomas*

2A Tift*

2A Toombs*

3A Towns

3A Treutlen*

3A Troup

3A Turner*

3A Twiggs*

3A Union

3A Upson

3A Walker

3A Walton

2A Ware*

3A Warren

3A Washington

2A Wayne*

3A Webster*

3A Wheeler*

3A White

3A Whitfield

3A Wilcox*

3A Wilkes

3A Wilkinson

2A Worth*

HAWAII

1A (all)*

IDAHO

5B Ada

6B Adams

6B Bannock

6B Bear Lake

5B Benewah

6B Bingham

6B Blaine

6B Boise

6B Bonner

6B Bonneville

6B Boundary

6B Butte

6B Camas

5B Canyon

6B Caribou

5B Cassia

6B Clark

5B Clearwater

6B Custer

5B Elmore

6B Franklin

6B Fremont

5B Gem

5B Gooding

5B Idaho

6B Jefferson

5B Jerome

5B Kootenai

5B Latah

6B Lemhi

5B Lewis

5B Lincoln

6B Madison

5B Minidoka

5B Nez Perce

6B Oneida

5B Owyhee

5B Payette

5B Power

5B Shoshone

6B Teton

5B Twin Falls

6B Valley

5B Washington

ILLINOIS

5A Adams

4A Alexander

4A Bond

5A Boone

5A Brown

5A Bureau

4A Calhoun

5A Carroll

5A Cass

5A Champaign

4A Christian

4A Clark

4A Clay

4A Clinton

4A Coles

5A Cook

4A Crawford

4A Cumberland

5A DeKalb

5A De Witt

5A Douglas

5A DuPage

5A Edgar

4A Edwards

4A Effingham

4A Fayette

5A Ford

4A Franklin

5A Fulton

4A Gallatin

4A Greene

5A Grundy

4A Hamilton

5A Hancock

4A Hardin

5A Henderson

5A Henry

5A Iroquois

4A Jackson

4A Jasper

4A Jefferson

4A Jersey

5A Jo Daviess

4A Johnson

5A Kane

5A Kankakee

5A Kendall

5A Knox

5A Lake

5A La Salle

4A Lawrence

5A Lee

5A Livingston

5A Logan

5A Macon

4A Macoupin

4A Madison

4A Marion

5A Marshall

5A Mason

4A Massac

5A McDonough

5A McHenry

5A McLean

5A Menard

5A Mercer

4A Monroe

4A Montgomery

5A Morgan

5A Moultrie

5A Ogle

5A Peoria

4A Perry

5A Piatt

5A Pike

4A Pope

4A Pulaski

5A Putnam

4A Randolph

4A Richland

5A Rock Island

4A Saline

5A Sangamon

5A Schuyler

5A Scott

4A Shelby

5A Stark

4A St. Clair

5A Stephenson

5A Tazewell

4A Union

5A Vermilion

4A Wabash

5A Warren

4A Washington

4A Wayne

4A White

5A Whiteside

5A Will

4A Williamson

5A Winnebago

5A Woodford

INDIANA

5A Adams

5A Allen

4A Bartholomew

5A Benton

5A Blackford

5A Boone

4A Brown

5A Carroll

5A Cass

4A Clark

4A Clay

5A Clinton

4A Crawford

4A Daviess

4A Dearborn

4A Decatur

5A De Kalb

5A Delaware

4A Dubois

5A Elkhart

4A Fayette

4A Floyd

5A Fountain

4A Franklin

5A Fulton

4A Gibson

5A Grant

4A Greene

5A Hamilton

5A Hancock

4A Harrison

4A Hendricks

5A Henry

5A Howard

5A Huntington

4A Jackson

5A Jasper

5A Jay

4A Jefferson

4A Jennings

4A Johnson

4A Knox

5A Kosciusko

5A LaGrange

5A Lake

5A La Porte

4A Lawrence

5A Madison

4A Marion

5A Marshall

4A Martin

5A Miami

4A Monroe

5A Montgomery

4A Morgan

5A Newton

5A Noble

4A Ohio

4A Orange

4A Owen

5A Parke

4A Perry

4A Pike

5A Porter

4A Posey

5A Pulaski

4A Putnam

5A Randolph

4A Ripley

4A Rush

4A Scott

4A Shelby

4A Spencer

5A Starke

5A Steuben

5A St. Joseph

4A Sullivan

4A Switzerland

5A Tippecanoe

5A Tipton

4A Union

4A Vanderburgh

5A Vermillion

4A Vigo

5A Wabash

5A Warren

4A Warrick

4A Washington

5A Wayne

5A Wells

5A White

5A Whitley

IOWA

5A Adair

5A Adams

5A Allamakee

5A Appanoose

5A Audubon

5A Benton

6A Black Hawk

5A Boone

5A Bremer

5A Buchanan

5A Buena Vista

5A Butler

5A Calhoun

5A Carroll

5A Cass

5A Cedar

6A Cerro Gordo

5A Cherokee

5A Chickasaw

5A Clarke

6A Clay

5A Clayton

5A Clinton

5A Crawford

5A Dallas

5A Davis

5A Decatur

5A Delaware

5A Des Moines

6A Dickinson

5A Dubuque

6A Emmet

5A Fayette

5A Floyd

5A Franklin

5A Fremont

5A Greene

5A Grundy

5A Guthrie

5A Hamilton

6A Hancock

5A Hardin

5A Harrison

5A Henry

5A Howard

5A Humboldt

5A Ida

5A Iowa

5A Jackson

5A Jasper

5A Jefferson

5A Johnson

5A Jones

5A Keokuk

6A Kossuth

5A Lee

5A Linn

5A Louisa

5A Lucas

6A Lyon

5A Madison

5A Mahaska

5A Marion

5A Marshall

5A Mills

6A Mitchell

5A Monona

5A Monroe

5A Montgomery

5A Muscatine

6A O'Brien

6A Osceola

5A Page

6A Palo Alto

5A Plymouth

5A Pocahontas

5A Polk

5A Pottawattamie

5A Poweshiek

5A Ringgold

5A Sac

5A Scott

5A Shelby

6A Sioux

5A Story

5A Tama

5A Taylor

5A Union

5A Van Buren

5A Wapello

5A Warren

5A Washington

5A Wayne

5A Webster

6A Winnebago

5A Winneshiek

5A Woodbury

6A Worth

5A Wright

KANSAS

4A Allen

4A Anderson

4A Atchison

4A Barber

4A Barton

4A Bourbon

4A Brown

4A Butler

4A Chase

4A Chautauqua

4A Cherokee

5A Cheyenne

4A Clark

4A Clay

4A Cloud

4A Coffey

4A Comanche

4A Cowley

4A Crawford

5A Decatur

4A Dickinson

4A Doniphan

4A Douglas

4A Edwards

4A Elk

4A Ellis

4A Ellsworth

4A Finney

4A Ford

4A Franklin

4A Geary

5A Gove

4A Graham

4A Grant

4A Gray

5A Greeley

4A Greenwood

4A Hamilton

4A Harper

4A Harvey

4A Haskell

4A Hodgeman

4A Jackson

4A Jefferson

5A Jewell

4A Johnson

4A Kearny

4A Kingman

4A Kiowa

4A Labette

4A Lane

4A Leavenworth

4A Lincoln

4A Linn

5A Logan

4A Lyon

4A Marion

4A Marshall

4A McPherson

4A Meade

4A Miami

4A Mitchell

4A Montgomery

4A Morris

4A Morton

4A Nemaha

4A Neosho

4A Ness

5A Norton

4A Osage

4A Osborne

4A Ottawa

4A Pawnee

5A Phillips

4A Pottawatomie

4A Pratt

5A Rawlins

4A Reno

5A Republic

4A Rice

4A Riley

4A Rooks

4A Rush

4A Russell

4A Saline

5A Scott

4A Sedgwick

4A Seward

4A Shawnee

5A Sheridan

5A Sherman

5A Smith

4A Stafford

4A Stanton

4A Stevens

4A Sumner

5A Thomas

4A Trego

4A Wabaunsee

5A Wallace

4A Washington

5A Wichita

4A Wilson

4A Woodson

4A Wyandotte

KENTUCKY

4A (all)

LOUISIANA

2A Acadia*

2A Allen*

2A Ascension*

2A Assumption*

2A Avoyelles*

2A Beauregard*

3A Bienville*

3A Bossier*

3A Caddo*

2A Calcasieu*

3A Caldwell*

2A Cameron*

3A Catahoula*

3A Claiborne*

3A Concordia*

3A De Soto*

2A East Baton Rouge*

3A East Carroll

2A East Feliciana*

2A Evangeline*

3A Franklin*

3A Grant*

2A Iberia*

2A Iberville*

3A Jackson*

2A Jefferson*

2A Jefferson Davis*

2A Lafayette*

2A Lafourche*

3A La Salle*

3A Lincoln*

2A Livingston*

3A Madison*

3A Morehouse

3A Natchitoches*

2A Orleans*

3A Ouachita*

2A Plaquemines*

2A Pointe Coupee*

2A Rapides*

3A Red River*

3A Richland*

3A Sabine*

2A St. Bernard*

2A St. Charles*

2A St. Helena*

2A St. James*

2A St. John the Baptist*

2A St. Landry*

2A St. Martin*

2A St. Mary*

2A St. Tammany*

2A Tangipahoa*

3A Tensas*

2A Terrebonne*

3A Union*

2A Vermilion*

3A Vernon*

2A Washington*

3A Webster*

2A West Baton Rouge*

3A West Carroll

2A West Feliciana*

3A Winn*

MAINE

6A Androscoggin

7 Aroostook

6A Cumberland

6A Franklin

6A Hancock

6A Kennebec

6A Knox

6A Lincoln

6A Oxford

6A Penobscot

6A Piscataquis

6A Sagadahoc

6A Somerset

6A Waldo

6A Washington

6A York

MARYLAND

5A Allegany

4A Anne Arundel

4A Baltimore

4A Baltimore (city)

4A Calvert

4A Caroline

4A Carroll

4A Cecil

4A Charles

4A Dorchester

4A Frederick

5A Garrett

4A Harford

4A Howard

4A Kent

4A Montgomery

4A Prince George's

4A Queen Anne's

4A Somerset

4A St. Mary's

4A Talbot

4A Washington

4A Wicomico

4A Worcester

MASSACHUSETTS

5A (all)

MICHIGAN

6A Alcona

6A Alger

5A Allegan

6A Alpena

6A Antrim

6A Arenac

6A Baraga

5A Barry

5A Bay

6A Benzie

5A Berrien

5A Branch

5A Calhoun

5A Cass

6A Charlevoix

6A Cheboygan

6A Chippewa

6A Clare

5A Clinton

6A Crawford

6A Delta

6A Dickinson

5A Eaton

6A Emmet

5A Genesee

6A Gladwin

6A Gogebic

6A Grand Traverse

5A Gratiot

5A Hillsdale

6A Houghton

5A Huron

5A Ingham

5A Ionia

6A Iosco

6A Iron

6A Isabella

5A Jackson

5A Kalamazoo

6A Kalkaska

5A Kent

7 Keweenaw

6A Lake

5A Lapeer

6A Leelanau

5A Lenawee

5A Livingston

6A Luce

6A Mackinac

5A Macomb

6A Manistee

7 Marquette

6A Mason

6A Mecosta

6A Menominee

5A Midland

6A Missaukee

5A Monroe

5A Montcalm

6A Montmorency

5A Muskegon

6A Newaygo

5A Oakland

6A Oceana

6A Ogemaw

6A Ontonagon

6A Osceola

6A Oscoda

6A Otsego

5A Ottawa

6A Presque Isle

6A Roscommon

5A Saginaw

5A Sanilac

6A Schoolcraft

5A Shiawassee

5A St. Clair

5A St. Joseph

5A Tuscola

5A Van Buren

5A Washtenaw

5A Wayne

6A Wexford

MINNESOTA

7 Aitkin

6A Anoka

6A Becker

7 Beltrami

6A Benton

6A Big Stone

6A Blue Earth

6A Brown

7 Carlton

6A Carver

7 Cass

6A Chippewa

6A Chisago

6A Clay

7 Clearwater

7 Cook

6A Cottonwood

7 Crow Wing

6A Dakota

6A Dodge

6A Douglas

6A Faribault

5A Fillmore

6A Freeborn

6A Goodhue

6A Grant

6A Hennepin

5A Houston

7 Hubbard

6A Isanti

7 Itasca

6A Jackson

6A Kanabec

6A Kandiyohi

7 Kittson

7 Koochiching

6A Lac qui Parle

7 Lake

7 Lake of the Woods

6A Le Sueur

6A Lincoln

6A Lyon

7 Mahnomen

7 Marshall

6A Martin

6A McLeod

6A Meeker

6A Mille Lacs

6A Morrison

6A Mower

6A Murray

6A Nicollet

6A Nobles

7 Norman

6A Olmsted

6A Otter Tail

7 Pennington

7 Pine

6A Pipestone

7 Polk

6A Pope

6A Ramsey

7 Red Lake

6A Redwood

6A Renville

6A Rice

6A Rock

7 Roseau

6A Scott

6A Sherburne

6A Sibley

6A Stearns

6A Steele

6A Stevens

7 St. Louis

6A Swift

6A Todd

6A Traverse

6A Wabasha

7 Wadena

6A Waseca

6A Washington

6A Watonwan

6A Wilkin

5A Winona

6A Wright

6A Yellow Medicine

MISSISSIPPI

3A Adams*

3A Alcorn

3A Amite*

3A Attala

3A Benton

3A Bolivar

3A Calhoun

3A Carroll

3A Chickasaw

3A Choctaw

3A Claiborne*

3A Clarke

3A Clay

3A Coahoma

3A Copiah*

3A Covington*

3A DeSoto

3A Forrest*

3A Franklin*

2A George*

3A Greene*

3A Grenada

2A Hancock*

2A Harrison*

3A Hinds*

3A Holmes

3A Humphreys

3A Issaquena

3A Itawamba

2A Jackson*

3A Jasper

3A Jefferson*

3A Jefferson Davis*

3A Jones*

3A Kemper

3A Lafayette

3A Lamar*

3A Lauderdale

3A Lawrence*

3A Leake

3A Lee

3A Leflore

3A Lincoln*

3A Lowndes

3A Madison

3A Marion*

3A Marshall

3A Monroe

3A Montgomery

3A Neshoba

3A Newton

3A Noxubee

3A Oktibbeha

3A Panola

2A Pearl River*

3A Perry*

3A Pike*

3A Pontotoc

3A Prentiss

3A Quitman

3A Rankin*

3A Scott

3A Sharkey

3A Simpson*

3A Smith*

2A Stone*

3A Sunflower

3A Tallahatchie

3A Tate

3A Tippah

3A Tishomingo

3A Tunica

3A Union

3A Walthall*

3A Warren*

3A Washington

3A Wayne*

3A Webster

3A Wilkinson*

3A Winston

3A Yalobusha

3A Yazoo

MISSOURI

5A Adair

5A Andrew

5A Atchison

4A Audrain

4A Barry

4A Barton

4A Bates

4A Benton

4A Bollinger

4A Boone

4A Buchanan

4A Butler

4A Caldwell

4A Callaway

4A Camden

4A Cape Girardeau

4A Carroll

4A Carter

4A Cass

4A Cedar

4A Chariton

4A Christian

5A Clark

4A Clay

4A Clinton

4A Cole

4A Cooper

4A Crawford

4A Dade

4A Dallas

5A Daviess

5A DeKalb

4A Dent

4A Douglas

3A Dunklin

4A Franklin

4A Gasconade

5A Gentry

4A Greene

5A Grundy

5A Harrison

4A Henry

4A Hickory

5A Holt

4A Howard

4A Howell

4A Iron

4A Jackson

4A Jasper

4A Jefferson

4A Johnson

5A Knox

4A Laclede

4A Lafayette

4A Lawrence

5A Lewis

4A Lincoln

5A Linn

5A Livingston

5A Macon

4A Madison

4A Maries

5A Marion

4A McDonald

5A Mercer

4A Miller

4A Mississippi

4A Moniteau

4A Monroe

4A Montgomery

4A Morgan

4A New Madrid

4A Newton

5A Nodaway

4A Oregon

4A Osage

4A Ozark

3A Pemiscot

4A Perry

4A Pettis

4A Phelps

5A Pike

4A Platte

4A Polk

4A Pulaski

5A Putnam

5A Ralls

4A Randolph

4A Ray

4A Reynolds

4A Ripley

4A Saline

5A Schuyler

5A Scotland

4A Scott

4A Shannon

5A Shelby

4A St. Charles

4A St. Clair

4A St. Francois

4A St. Louis

4A St. Louis (city)

4A Ste. Genevieve

4A Stoddard

4A Stone

5A Sullivan

4A Taney

4A Texas

4A Vernon

4A Warren

4A Washington

4A Wayne

4A Webster

5A Worth

4A Wright

MONTANA

6B (all)

NEBRASKA

5A (all)

NEVADA

4B Carson City (city)

5B Churchill

3B Clark

4B Douglas

5B Elko

4B Esmeralda

5B Eureka

5B Humboldt

5B Lander

4B Lincoln

4B Lyon

4B Mineral

4B Nye

5B Pershing

5B Storey

5B Washoe

5B White Pine

NEW HAMPSHIRE

6A Belknap

6A Carroll

5A Cheshire

6A Coos

6A Grafton

5A Hillsborough

5A Merrimack

5A Rockingham

5A Strafford

6A Sullivan

NEW JERSEY

4A Atlantic

5A Bergen

4A Burlington

4A Camden

4A Cape May

4A Cumberland

4A Essex

4A Gloucester

4A Hudson

5A Hunterdon

4A Mercer

4A Middlesex

4A Monmouth

5A Morris

4A Ocean

5A Passaic

4A Salem

5A Somerset

5A Sussex

4A Union

5A Warren

NEW MEXICO

4B Bernalillo

4B Catron

3B Chaves

4B Cibola

5B Colfax

4B Curry

4B DeBaca

3B Doña Ana

3B Eddy

4B Grant

4B Guadalupe

5B Harding

3B Hidalgo

3B Lea

4B Lincoln

5B Los Alamos

3B Luna

5B McKinley

5B Mora

3B Otero

4B Quay

5B Rio Arriba

4B Roosevelt

5B Sandoval

5B San Juan

5B San Miguel

5B Santa Fe

3B Sierra

4B Socorro

5B Taos

5B Torrance

4B Union

4B Valencia

NEW YORK

5A Albany

5A Allegany

4A Bronx

5A Broome

5A Cattaraugus

5A Cayuga

5A Chautauqua

5A Chemung

6A Chenango

6A Clinton

5A Columbia

5A Cortland

6A Delaware

5A Dutchess

5A Erie

6A Essex

6A Franklin

6A Fulton

5A Genesee

5A Greene

6A Hamilton

6A Herkimer

6A Jefferson

4A Kings

6A Lewis

5A Livingston

6A Madison

5A Monroe

6A Montgomery

4A Nassau

4A New York

5A Niagara

6A Oneida

5A Onondaga

5A Ontario

5A Orange

5A Orleans

5A Oswego

6A Otsego

5A Putnam

4A Queens

5A Rensselaer

4A Richmond

5A Rockland

5A Saratoga

5A Schenectady

5A Schoharie

5A Schuyler

5A Seneca

5A Steuben

6A St. Lawrence

4A Suffolk

6A Sullivan

5A Tioga

5A Tompkins

6A Ulster

6A Warren

5A Washington

5A Wayne

4A Westchester

5A Wyoming

5A Yates

NORTH CAROLINA

3A Alamance

3A Alexander

5A Alleghany

3A Anson

5A Ashe

5A Avery

3A Beaufort

3A Bertie

3A Bladen

3A Brunswick*

4A Buncombe

4A Burke

3A Cabarrus

4A Caldwell

3A Camden

3A Carteret*

3A Caswell

3A Catawba

3A Chatham

3A Cherokee

3A Chowan

3A Clay

3A Cleveland

3A Columbus*

3A Craven

3A Cumberland

3A Currituck

3A Dare

3A Davidson

3A Davie

3A Duplin

3A Durham

3A Edgecombe

3A Forsyth

3A Franklin

3A Gaston

3A Gates

4A Graham

3A Granville

3A Greene

3A Guilford

3A Halifax

3A Harnett

4A Haywood

4A Henderson

3A Hertford

3A Hoke

3A Hyde

3A Iredell

4A Jackson

3A Johnston

3A Jones

3A Lee

3A Lenoir

3A Lincoln

4A Macon

4A Madison

3A Martin

4A McDowell

3A Mecklenburg

4A Mitchell

3A Montgomery

3A Moore

3A Nash

3A New Hanover*

3A Northampton

3A Onslow*

3A Orange

3A Pamlico

3A Pasquotank

3A Pender*

3A Perquimans

3A Person

3A Pitt

3A Polk

3A Randolph

3A Richmond

3A Robeson

3A Rockingham

3A Rowan

3A Rutherford

3A Sampson

3A Scotland

3A Stanly

4A Stokes

4A Surry

4A Swain

4A Transylvania

3A Tyrrell

3A Union

3A Vance

3A Wake

3A Warren

3A Washington

5A Watauga

3A Wayne

A Wilkes

3A Wilson

4A Yadkin

5A Yancey

NORTH DAKOTA

6A Adams

6A Barnes

7 Benson

6A Billings

7 Bottineau

6A Bowman

7 Burke

6A Burleigh

6A Cass

7 Cavalier

6A Dickey

7 Divide

6A Dunn

6A Eddy

6A Emmons

6A Foster

6A Golden Valley

7 Grand Forks

6A Grant

6A Griggs

6A Hettinger

6A Kidder

6A LaMoure

6A Logan

7 McHenry

6A McIntosh

6A McKenzie

6A McLean

6A Mercer

6A Morton

6A Mountrail

7 Nelson

6A Oliver

7 Pembina

7 Pierce

7 Ramsey

6A Ransom

7 Renville

6A Richland

7 Rolette

6A Sargent

6A Sheridan

6A Sioux

6A Slope

6A Stark

6A Steele

6A Stutsman

7 Towner

6A Traill

7 Walsh

7 Ward

6A Wells

6A Williams

OHIO

4A Adams

5A Allen

5A Ashland

5A Ashtabula

4A Athens

5A Auglaize

5A Belmont

4A Brown

4A Butler

5A Carroll

5A Champaign

5A Clark

4A Clermont

4A Clinton

5A Columbiana

5A Coshocton

5A Crawford

5A Cuyahoga

5A Darke

5A Defiance

5A Delaware

5A Erie

5A Fairfield

4A Fayette

4A Franklin

5A Fulton

4A Gallia

5A Geauga

4A Greene

5A Guernsey

4A Hamilton

5A Hancock

5A Hardin

5A Harrison

5A Henry

4A Highland

4A Hocking

5A Holmes

5A Huron

4A Jackson

5A Jefferson

5A Knox

5A Lake

4A Lawrence

5A Licking

5A Logan

5A Lorain

5A Lucas

4A Madison

5A Mahoning

5A Marion

5A Medina

4A Meigs

5A Mercer

5A Miami

5A Monroe

5A Montgomery

5A Morgan

5A Morrow

5A Muskingum

5A Noble

5A Ottawa

5A Paulding

5A Perry

4A Pickaway

4A Pike

5A Portage

5A Preble

5A Putnam

5A Richland

4A Ross

5A Sandusky

4A Scioto

5A Seneca

5A Shelby

5A Stark

5A Summit

5A Trumbull

5A Tuscarawas

5A Union

5A Van Wert

4A Vinton

4A Warren

4A Washington

5A Wayne

5A Williams

5A Wood

5A Wyandot

OKLAHOMA

3A Adair

4A Alfalfa

3A Atoka

4B Beaver

3A Beckham

3A Blaine

3A Bryan

3A Caddo

3A Canadian

3A Carter

3A Cherokee

3A Choctaw

4B Cimarron

3A Cleveland

3A Coal

3A Comanche

3A Cotton

4A Craig

3A Creek

3A Custer

4A Delaware

3A Dewey

4A Ellis

4A Garfield

3A Garvin

3A Grady

4A Grant

3A Greer

3A Harmon

4A Harper

3A Haskell

3A Hughes

3A Jackson

3A Jefferson

3A Johnston

4A Kay

3A Kingfisher

3A Kiowa

3A Latimer

3A Le Flore

3A Lincoln

3A Logan

3A Love

4A Major

3A Marshall

3A Mayes

3A McClain

3A McCurtain

3A McIntosh

3A Murray

3A Muskogee

3A Noble

4A Nowata

3A Okfuskee

3A Oklahoma

3A Okmulgee

4A Osage

4A Ottawa

3A Pawnee

3A Payne

3A Pittsburg

3A Pontotoc

3A Pottawatomie

3A Pushmataha

3A Roger Mills

3A Rogers

3A Seminole

3A Sequoyah

3A Stephens

4B Texas

3A Tillman

3A Tulsa

3A Wagoner

4A Washington

3A Washita

4A Woods

4A Woodward

OREGON

5B Baker

4C Benton

4C Clackamas

4C Clatsop

4C Columbia

4C Coos

5B Crook

4C Curry

5B Deschutes

4C Douglas

5B Gilliam

5B Grant

5B Harney

5B Hood River

4C Jackson

5B Jefferson

4C Josephine

5B Klamath

5B Lake

4C Lane

4C Lincoln

4C Linn

5B Malheur

4C Marion

5B Morrow

4C Multnomah

4C Polk

5B Sherman

4C Tillamook

5B Umatilla

5B Union

5B Wallowa

5B Wasco

4C Washington

5B Wheeler

4C Yamhill

PENNSYLVANIA

4A Adams

5A Allegheny

5A Armstrong

5A Beaver

5A Bedford

4A Berks

5A Blair

5A Bradford

4A Bucks

5A Butler

5A Cambria

5A Cameron

5A Carbon

5A Centre

4A Chester

5A Clarion

5A Clearfield

5A Clinton

5A Columbia

5A Crawford

4A Cumberland

4A Dauphin

4A Delaware

5A Elk

5A Erie

5A Fayette

5A Forest

4A Franklin

5A Fulton

5A Greene

5A Huntingdon

5A Indiana

5A Jefferson

5A Juniata

5A Lackawanna

4A Lancaster

5A Lawrence

4A Lebanon

5A Lehigh

5A Luzerne

5A Lycoming

5A McKean

5A Mercer

5A Mifflin

5A Monroe

4A Montgomery

5A Montour

5A Northampton

5A Northumberland

4A Perry

4A Philadelphia

5A Pike

5A Potter

5A Schuylkill

5A Snyder

5A Somerset

5A Sullivan

5A Susquehanna

5A Tioga

5A Union

5A Venango

5A Warren

5A Washington

5A Wayne

5A Westmoreland

5A Wyoming

4A York

RHODE ISLAND

5A (all)

SOUTH CAROLINA

3A Abbeville

3A Aiken

3A Allendale*

3A Anderson

3A Bamberg*

3A Barnwell*

2A Beaufort*

3A Berkeley*

3A Calhoun

3A Charleston*

3A Cherokee

3A Chester

3A Chesterfield

3A Clarendon

3A Colleton*

3A Darlington

3A Dillon

3A Dorchester*

3A Edgefield

3A Fairfield

3A Florence

3A Georgetown*

3A Greenville

3A Greenwood

3A Hampton*

3A Horry*

2A Jasper*

3A Kershaw

3A Lancaster

3A Laurens

3A Lee

3A Lexington

3A Marion

3A Marlboro

3A McCormick

3A Newberry

3A Oconee

3A Orangeburg

3A Pickens

3A Richland

3A Saluda

3A Spartanburg

3A Sumter

3A Union

3A Williamsburg

3A York

SOUTH DAKOTA

6A Aurora

6A Beadle

5A Bennett

5A Bon Homme

6A Brookings

6A Brown

5A Brule

6A Buffalo

6A Butte

6A Campbell

5A Charles Mix

6A Clark

5A Clay

6A Codington

6A Corson

6A Custer

6A Davison

6A Day

6A Deuel

6A Dewey

5A Douglas

6A Edmunds

6A Fall River

6A Faulk

6A Grant

5A Gregory

5A Haakon

6A Hamlin

6A Hand

6A Hanson

6A Harding

6A Hughes

5A Hutchinson

6A Hyde

5A Jackson

6A Jerauld

5A Jones

6A Kingsbury

6A Lake

6A Lawrence

6A Lincoln

5A Lyman

6A Marshall

6A McCook

6A McPherson

6A Meade

5A Mellette

6A Miner

6A Minnehaha

6A Moody

6A Pennington

6A Perkins

6A Potter

6A Roberts

6A Sanborn

6A Shannon

6A Spink

5A Stanley

6A Sully

5A Todd

5A Tripp

6A Turner

5A Union

6A Walworth

5A Yankton

6A Ziebach

TENNESSEE

4A Anderson

3A Bedford

4A Benton

4A Bledsoe

4A Blount

4A Bradley

4A Campbell

4A Cannon

4A Carroll

4A Carter

4A Cheatham

3A Chester

4A Claiborne

4A Clay

4A Cocke

3A Coffee

3A Crockett

4A Cumberland

3A Davidson

3A Decatur

4A DeKalb

4A Dickson

3A Dyer

3A Fayette

4A Fentress

3A Franklin

3A Gibson

3A Giles

4A Grainger

4A Greene

3A Grundy

4A Hamblen

3A Hamilton

4A Hancock

3A Hardeman

3A Hardin

4A Hawkins

3A Haywood

3A Henderson

4A Henry

3A Hickman

4A Houston

4A Humphreys

4A Jackson

4A Jefferson

4A Johnson

4A Knox

4A Lake

3A Lauderdale

3A Lawrence

3A Lewis

3A Lincoln

4A Loudon

4A Macon

3A Madison

3A Marion

3A Marshall

3A Maury

4A McMinn

3A McNairy

4A Meigs

4A Monroe

4A Montgomery

3A Moore

4A Morgan

4A Obion

4A Overton

3A Perry

4A Pickett

4A Polk

4A Putnam

4A Rhea

4A Roane

4A Robertson

3A Rutherford

4A Scott

4A Sequatchie

4A Sevier

3A Shelby

4A Smith

4A Stewart

4A Sullivan

4A Sumner

3A Tipton

4A Trousdale

4A Unicoi

4A Union

4A Van Buren

4A Warren

4A Washington

3A Wayne

4A Weakley

4A White

3A Williamson

4A Wilson

TEXAS

2A Anderson*

3B Andrews

2A Angelina*

2A Aransas*

3A Archer

4B Armstrong

2A Atascosa*

2A Austin*

4B Bailey

2B Bandera

2A Bastrop*

3B Baylor

2A Bee*

2A Bell*

2A Bexar*

3A Blanco*

3B Borden

2A Bosque*

3A Bowie*

2A Brazoria*

2A Brazos*

3B Brewster

4B Briscoe

2A Brooks*

3A Brown*

2A Burleson*

3A Burnet*

2A Caldwell*

2A Calhoun*

3B Callahan

1A Cameron*

3A Camp*

4B Carson

3A Cass*

4B Castro

2A Chambers*

2A Cherokee*

3B Childress

3A Clay

4B Cochran

3B Coke

3B Coleman

3A Collin*

3B Collingsworth

2A Colorado*

2A Comal*

3A Comanche*

3B Concho

3A Cooke

2A Coryell*

3B Cottle

3B Crane

3B Crockett

3B Crosby

3B Culberson

4B Dallam

2A Dallas*

3B Dawson

4B Deaf Smith

3A Delta

3A Denton*

2A DeWitt*

3B Dickens

2B Dimmit

4B Donley

2A Duval*

3A Eastland

3B Ector

2B Edwards

2A Ellis*

3B El Paso

3A Erath*

2A Falls*

3A Fannin

2A Fayette*

3B Fisher

4B Floyd

3B Foard

2A Fort Bend*

3A Franklin*

2A Freestone*

2B Frio

3B Gaines

2A Galveston*

3B Garza

3A Gillespie*

3B Glasscock

2A Goliad*

2A Gonzales*

4B Gray

3A Grayson

3A Gregg*

2A Grimes*

2A Guadalupe*

4B Hale

3B Hall

3A Hamilton*

4B Hansford

3B Hardeman

2A Hardin*

2A Harris*

3A Harrison*

4B Hartley

3B Haskell

2A Hays*

3B Hemphill

3A Henderson*

1A Hidalgo*

2A Hill*

4B Hockley

3A Hood*

3A Hopkins*

2A Houston*

3B Howard

3B Hudspeth

3A Hunt*

4B Hutchinson

3B Irion

3A Jack

2A Jackson*

2A Jasper*

3B Jeff Davis

2A Jefferson*

2A Jim Hogg*

2A Jim Wells*

2A Johnson*

3B Jones

2A Karnes*

3A Kaufman*

3A Kendall*

2A Kenedy*

3B Kent

3B Kerr

3B Kimble

3B King

2B Kinney

2A Kleberg*

3B Knox

3A Lamar*

4B Lamb

3A Lampasas*

2B La Salle

2A Lavaca*

2A Lee*

2A Leon*

2A Liberty*

2A Limestone*

4B Lipscomb

2A Live Oak*

3A Llano*

3B Loving

3B Lubbock

3B Lynn

2A Madison*

3A Marion*

3B Martin

3B Mason

2A Matagorda*

2B Maverick

3B McCulloch

2A McLennan*

2A McMullen*

2B Medina

3B Menard

3B Midland

2A Milam*

3A Mills*

3B Mitchell

3A Montague

2A Montgomery*

4B Moore

3A Morris*

3B Motley

3A Nacogdoches*

2A Navarro*

2A Newton*

3B Nolan

2A Nueces*

4B Ochiltree

4B Oldham

2A Orange*

3A Palo Pinto*

3A Panola*

3A Parker*

4B Parmer

3B Pecos

2A Polk*

4B Potter

3B Presidio

3A Rains*

4B Randall

3B Reagan

2B Real

3A Red River*

3B Reeves

2A Refugio*

4B Roberts

2A Robertson*

3A Rockwall*

3B Runnels

3A Rusk*

3A Sabine*

3A San Augustine*

2A San Jacinto*

2A San Patricio*

3A San Saba*

3B Schleicher

3B Scurry

3B Shackelford

3A Shelby*

4B Sherman

3A Smith*

3A Somervell*

2A Starr*

3A Stephens

3B Sterling

3B Stonewall

3B Sutton

4B Swisher

2A Tarrant*

3B Taylor

3B Terrell

3B Terry

3B Throckmorton

3A Titus*

3B Tom Green

2A Travis*

2A Trinity*

2A Tyler*

3A Upshur*

3B Upton

2B Uvalde

2B Val Verde

3A Van Zandt*

2A Victoria*

2A Walker*

2A Waller*

3B Ward

2A Washington*

2B Webb

2A Wharton*

3B Wheeler

3A Wichita

3B Wilbarger

1A Willacy*

2A Williamson*

2A Wilson*

3B Winkler

3A Wise

3A Wood*

4B Yoakum

3A Young

2B Zapata

2B Zavala

UTAH

5B Beaver

5B Box Elder

5B Cache

5B Carbon

6B Daggett

5B Davis

6B Duchesne

5B Emery

5B Garfield

5B Grand

5B Iron

5B Juab

5B Kane

5B Millard

6B Morgan

5B Piute

6B Rich

5B Salt Lake

5B San Juan

5B Sanpete

5B Sevier

6B Summit

5B Tooele

6B Uintah

5B Utah

6B Wasatch

3B Washington

5B Wayne

5B Weber

VERMONT

6A (all)

VIRGINIA

4A (all except as follows:)

5A Alleghany

5A Bath

3A Brunswick

3A Chesapeake

5A Clifton Forge

5A Covington

3A Emporia

3A Franklin

3A Greensville

3A Halifax

3A Hampton

5A Highland

3A Isle of Wight

3A Mecklenburg

3A Newport News

3A Norfolk

3A Pittsylvania

3A Portsmouth

3A South Boston

3A Southampton

3A Suffolk

3A Surry

3A Sussex

3A Virginia Beach

WASHINGTON

5B Adams

5B Asotin

5B Benton

5B Chelan

5C Clallam

4C Clark

5B Columbia

4C Cowlitz

5B Douglas

6B Ferry

5B Franklin

5B Garfield

5B Grant

4C Grays Harbor

5C Island

4C Jefferson

4C King

5C Kitsap

5B Kittitas

5B Klickitat

4C Lewis

5B Lincoln

4C Mason

5B Okanogan

4C Pacific

6B Pend Oreille

4C Pierce

5C San Juan

4C Skagit

5B Skamania

4C Snohomish

5B Spokane

6B Stevens

4C Thurston

4C Wahkiakum

5B Walla Walla

4C Whatcom

5B Whitman

5B Yakima

WEST VIRGINIA

5A Barbour

4A Berkeley

4A Boone

4A Braxton

5A Brooke

4A Cabell

4A Calhoun

4A Clay

4A Doddridge

4A Fayette

4A Gilmer

5A Grant

4A Greenbrier

5A Hampshire

5A Hancock

5A Hardy

5A Harrison

4A Jackson

4A Jefferson

4A Kanawha

4A Lewis

4A Lincoln

4A Logan

5A Marion

5A Marshall

4A Mason

4A McDowell

4A Mercer

5A Mineral

4A Mingo

5A Monongalia

4A Monroe

4A Morgan

4A Nicholas

5A Ohio

5A Pendleton

4A Pleasants

5A Pocahontas

5A Preston

4A Putnam

4A Raleigh

5A Randolph

4A Ritchie

4A Roane

4A Summers

5A Taylor

5A Tucker

4A Tyler

4A Upshur

4A Wayne

4A Webster

5A Wetzel

4A Wirt

4A Wood

4A Wyoming

WISCONSIN

5A Adams

6A Ashland

6A Barron

6A Bayfield

6A Brown

6A Buffalo

6A Burnett

5A Calumet

6A Chippewa

6A Clark

5A Columbia

5A Crawford

5A Dane

5A Dodge

6A Door

6A Douglas

6A Dunn

6A Eau Claire

6A Florence

5A Fond du Lac

6A Forest

5A Grant

5A Green

5A Green Lake

5A Iowa

6A Iron

6A Jackson

5A Jefferson

5A Juneau

5A Kenosha

6A Kewaunee

5A La Crosse

5A Lafayette

6A Langlade

6A Lincoln

6A Manitowoc

6A Marathon

6A Marinette

6A Marquette

6A Menominee

5A Milwaukee

5A Monroe

6A Oconto

6A Oneida

5A Outagamie

5A Ozaukee

6A Pepin

6A Pierce

6A Polk

6A Portage

6A Price

5A Racine

5A Richland

5A Rock

6A Rusk

5A Sauk

6A Sawyer

6A Shawano

6A Sheboygan

6A St. Croix

6A Taylor

6A Trempealeau

5A Vernon

6A Vilas

5A Walworth

6A Washburn

5A Washington

5A Waukesha

6A Waupaca

5A Waushara

5A Winnebago

6A Wood

WYOMING

6B Albany

6B Big Horn

6B Campbell

6B Carbon

6B Converse

6B Crook

6B Fremont

5B Goshen

6B Hot Springs

6B Johnson

5B Laramie

7 Lincoln

6B Natrona

6B Niobrara

6B Park

5B Platte

6B Sheridan

7 Sublette

6B Sweetwater

7 Teton

6B Uinta

6B Washakie

6B Weston

US TERRITORIES

AMERICAN SAMOA

1A (all)*

GUAM

1A (all)*

NORTHERN MARIANA ISLANDS

1A (all)*

PUERTO RICO

1A (all except as follows:)*

2B Barraquitas

2B Cayey

VIRGIN ISLANDS

1A (all)*

a. Key: A — Moist, B — Dry, C — Marine. Absence of moisture designation indicates moisture regime is irrelevant. Asterisk (*) indicates a Warm Humid location.

In Table N1101.7, Warm Humid counties are identified by an asterisk.

To determine the climate zones for locations not listed in this code, use the following information to determine climate zone numbers and letters in accordance with Items 1 through 5.

  1. Determine the thermal climate zone, 0 through 8, from Table N1101.7.2 using the heating (HDD) and cooling degree-days (CDD) for the location.
  2. Determine the moisture zone (Marine, Dry or Humid) in accordance with Items 2.1 through 2.3.

    2.1. If monthly average temperature and precipitation data are available, use the Marine, Dry and Humid definitions to determine the moisture zone (C, B or A).

    2.2. If annual average temperature information (including degree-days) and annual precipitation (i.e., annual mean) are available, use Items 2.2.1 through 2.2.3 to determine the moisture zone. If the moisture zone is not Marine, then use the Dry definition to determine whether Dry or Humid.

    2.2.1. If thermal climate zone is 3 and CDD50°F ≤ 4,500 (CDD10°C ≤ 2500), climate zone is Marine (3C).

    2.2.2. If thermal climate zone is 4 and CDD50°F ≤ 2,700 (CDD10°C ≤ 1500), climate zone is Marine (4C).

    2.2.3. If thermal climate zone is 5 and CDD50°F ≤ 1,800 (CDD10°C ≤ 1000), climate zone is Marine (5C).

    2.3. If only degree-day information is available, use Items 2.3.1 through 2.3.3 to determine the moisture zone. If the moisture zone is not Marine, then it is not possible to assign Humid or Dry moisture zone for this location.

    2.3.1. If thermal climate zone is 3 and CDD50°F ≤ 4,500 (CDD10°C ≤ 2500), climate zone is Marine (3C).

    2.3.2. If thermal climate zone is 4 and CDD50°F ≤ 2,700 (CDD10°C ≤ 1500), climate zone is Marine (4C).

    2.3.3. If thermal climate zone is 5 and CDD50°F ≤ 1,800 (CDD10°C ≤ 1000), climate zone is Marine (5C).

  3. Marine (C) Zone definition: Locations meeting all of the criteria in Items 3.1 through 3.4.

    3.1. Mean temperature of coldest month between 27°F (-3°C) and 65°F (18°C).

    3.2. Warmest month mean < 72°F (22°C).

    3.3. Not fewer than four months with mean temperatures over 50°F (10°C).

    3.4. 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.

  4. Dry (B) definition: Locations meeting the criteria in Items 4.1 through 4.4.

    4.1. Not Marine (C).

    4.2. If 70 percent or more of the precipitation, P, occurs during the high sun period, defined as April through September in the Northern Hemisphere and October through March in the Southern Hemisphere, then the dry/humid threshold is in accordance with Equation 11-1.

    (Equation 11-1)

    where:
    P = Annual precipitation, inches (mm).
    T = Annual mean temperature, °F (°C).

    4.3.  If between 30 and 70 percent of the precipitation, P, occurs during the high sun period, defined as April through September in the Northern Hemisphere and October through March in the Southern Hemisphere, then the dry/humid threshold is in accordance with Equation 11-2.

    (Equation 11-2)

    where:
    P = Annual precipitation, inches (mm).
    T = Annual mean temperature, °F (°C).

    4.4.  If 30 percent or less of the precipitation, P, occurs during the high sun period, defined as April through September in the Northern Hemisphere and October through March in the Southern Hemisphere, then the dry/humid threshold is in accordance with Equation 11-3.

    (Equation 11-3)

    where:
    P = Annual precipitation, inches (mm).
    T = Annual mean temperature, °F (°C).
  5. Humid (A) definition: Locations that are not Marine (C) or Dry (B).

TABLE N1101.7.2 (R301.3)

THERMAL CLIMATE ZONE DEFINITIONS
ZONE NUMBER THERMAL CRITERIA
IP Units SI Units
0

10,800 < CDD50°F

6000 < CDD10°C

1

9,000 < CDD50°F < 10,800

5000 < CDD10°C < 6000

2

6,300 < CDD50°F ≤ 9,000

3500 < CDD10°C ≤ 5000

3

CDD50°F ≤ 6,300 AND HDD65°F ≤ 3,600

CDD10°C ≤ 3500 AND HDD18°C ≤ 2000

4

CDD50°F ≤ 6,300 AND 3,600 < HDD65°F ≤ 5,400

CDD10°C ≤ 3500 AND 2000 < HDD18°C ≤ 3000

5

CDD50°F < 6,300 AND

CDD10°C < 3500 AND

5,400 < HDD65°F ≤ 7,200

3000 < HDD18°C ≤ 4000

6

7,200 < HDD65°F ≤ 9,000

4000 < HDD18°C ≤ 5000

7

9,000 < HDD65°F ≤ 12,600

5000 < HDD18°C ≤ 7000

8

12,600 < HDD65°F

7000 < HDD18°C

For SI: °C = [(°F) — 32]/1.8.

The tropical climate region 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 that is 12 inches (305 mm) or greater in width. Alternatively, the insulation installers shall provide a certification that indicates the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown-in or sprayed fiberglass and cellulose insulation, the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be indicated on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and the R-value of the installed thickness shall be indicated on the certification. For insulated siding, the R-value shall be on a label on the product's package and shall be indicated on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.

Exception: For roof insulation installed above the deck, the R-value shall be labeled as required by the material standards specified in Table R906.2.

The thickness of blown-in or sprayed fiberglass and cellulose roof and ceiling insulation shall be written in inches (mm) on markers that are installed at not less than 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. The thickness and installed R-value of sprayed polyurethane foam insulation shall be indicated on the certification provided by the insulation installer.
Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable at inspection. For insulation materials that are installed without an observable manufacturer's R-value mark, such as blown or draped products, an insulation certificate complying with Section N1101.10.1 shall be left immediately after installation by the installer, in a conspicuous location within the building, to certify the installed R-value of the insulation material.

U-factors of fenestration products such as 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 Table N1101.10.3(1) or N1101.10.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products such as 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).


TABLE N1101.10.3(1) [R303.1.3(1)]

DEFAULT GLAZED WINDOW, GLASS DOOR AND SKYLIGHT U-FACTORS
FRAME TYPE WINDOW AND GLASS DOOR SKYLIGHT
Single pane Double pane 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 OPAQUE DOOR U-FACTORS
DOOR TYPE OPAQUE U-FACTOR
Uninsulated Metal 1.20
Insulated Metal 0.60
Wood 0.50
Insulated, nonmetal edge, not exceeding 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 Part 460 of US-FTC CFR Title 16 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 C1363. Installation for testing shall be in accordance with the manufacturer's instructions.
Insulation having an air permeability not greater than 0.004 cubic feet per minute per square foot [0.002 L/(s × m2)] under pressure differential of 0.3 inch water gauge (75 Pa) when tested in accordance with ASTM E2178 shall be determined air-impermeable insulation.
Materials, systems and equipment shall be installed in accordance with the manufacturer's instructions and this code.
Insulation applied to the exterior of basement walls, crawl space walls and the perimeter of slab-on-grade floors shall have a 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.
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 visible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.
The Prescriptive Compliance Option requires compliance with Sections N1101 through N1104.
The Total Building Performance Compliance Path requires compliance with Section N1105.
The Energy Rating Index (ERI) option requires compliance with Section N1106.
The Tropical Climate Region Option requires compliance with Section N1107.
This section establishes additional requirements applicable to all compliance approaches to achieve additional energy efficiency.
  1. For buildings complying with Section N1101.13.1, one of the additional efficiency package options shall be installed according to Section N1108.2.
  2. For buildings complying with Section N1101.13.2, the building shall meet one of the following:

    2.1. One of the additional efficiency package options in Section N1108.2 shall be installed without including such measures in the proposed design under Section N1105.

    2.2. The proposed design of the building under Section N1105.2 shall have an annual energy cost that is less than or equal to 95 percent of the annual energy cost of the standard reference design.

  3. For buildings complying with the Energy Rating Index alternative Section N1101.13.3, the Energy Rating Index value shall be at least 5 percent less than the Energy Rating Index target specified.
The option selected for compliance shall be identified on the certificate required by Section N1101.14.

A permanent certificate shall be completed by the builder or other approved party 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 indicate the following:

  1. The predominant R-values of insulation installed in or on ceilings, roofs, walls, foundation components such as slabs, basement walls, crawl space walls and floors, and ducts outside conditioned spaces
  2. U-factors of fenestration and the solar heat gain coefficient (SHGC) of fenestration. Where there is more than one value for any component of the building envelope, the certificate shall indicate both the value covering the largest area and the area weighted average value if available.
  3. The results from any required duct system and building envelope air leakage testing performed on the building.
  4. The types, sizes 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 indicate "gas-fired unvented room heater," "electric furnace" or "baseboard electric heater," as appropriate. An efficiency is not required to be indicated for gas-fired unvented room heaters, electric furnaces and electric baseboard heaters.
  5. Where on-site photovoltaic panel systems have been installed, the array capacity, inverter efficiency, panel tilt and orientation shall be noted on the certificate.
  6. For buildings where an Energy Rating Index score is determined in accordance with Section N1106, the Energy Rating Index score, both with and without any on-site generation, shall be listed on the certificate.
  7. The code edition under which the structure was permitted and the compliance path used.

The building thermal envelope shall comply with the requirements of Sections N1102.1.1 through N1102.1.5.

Exceptions:

  1. 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.

    1.1. 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.

    1.2. Those that do not contain conditioned space.

  2. Log homes designed in accordance with ICC 400.
Wall assemblies in the building thermal envelope shall comply with the vapor retarder requirements of Section R702.7.
The building thermal envelope shall meet the requirements of Table N1102.1.2 based on the climate zone specified in Section N1101.7. Assemblies shall have a U-factor equal to or less than that specified in Table N1102.1.2. Fenestration shall have a U-factor and glazed fenestration SHGC equal to or less than that specified in Table N1102.1.2.

TABLE N1102.1.2 (R402.1.2)

MAXIMUM ASSEMBLY U-FACTORSa AND FENESTRATION REQUIREMENTS
CLIMATE ZONE FENESTRATION U-FACTORf SKYLIGHT U-FACTOR GLAZED FENESTRATION SHGCd,e CEILING U-FACTOR FRAME WALL U-FACTOR MASS WALL U-FACTORb FLOOR U-FACTOR BASEMENT WALL U-FACTOR CRAWL SPACE WALL U-FACTOR
0
0.50
0.75 0.25 0.035 0.084 0.197 0.064 0.360 0.477
1 0.50 0.75 0.25 0.035 0.084 0.197 0.064 0.360 0.477
2 0.40 0.65 0.25 0.026 0.084 0.165 0.064 0.360 0.477
3 0.30 0.55 0.25 0.026 0.060 0.098 0.047 0.091c 0.136
4 except Marine 0.30 0.55 0.40 0.024 0.045 0.098 0.047 0.059 0.065
5 and Marine 4 0.30 0.55 0.40 0.024 0.045 0.082 0.033 0.050 0.055
6 0.30 0.55 NR 0.024 0.045 0.060 0.033 0.050 0.055
7 and 8 0.30 0.55 NR 0.024 0.045 0.057 0.028 0.050 0.055

For SI: 1 foot = 304.8 mm.

  1. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.
  2. Mass walls shall be in accordance with Section R402.2.5. Where more than half the insulation is on the interior, the mass wall U-factors shall not exceed 0.17 in Climate Zones 0 and 1, 0.14 in Climate Zone 2, 0.12 in Climate Zone 3, 0.087 in Climate Zone 4 except Marine, 0.065 in Climate Zone 5 and Marine 4, and 0.057 in Climate Zones 6 through 8.
  3. In Warm Humid locations as defined by Figure R301.1 and Table R301.1, the basement wall U-factor shall not exceed 0.360.
  4. The SHGC column applies to all glazed fenestration.

    Exception:  In Climate Zones 0 through 3, skylights shall be permitted to be excluded from glazed fenestration SHGC requirements provided that the SHGC for such skylights does not exceed 0.30.

  5. There are no SHGC requirements in the Marine Zone.
  6. A maximum U-factor of 0.32 shall apply in Marine Climate Zone 4 and Climate Zones 5 through 8 to vertical fenestration products installed in buildings located either:

    1. Above 4,000 feet in elevation above sea level, or
    2. In windborne debris regions where protection of openings is required by Section R301.2.1.2.
Assemblies with R-value of insulation materials equal to or greater than that specified in Table N1102.1.3 shall be an alternative to the U-factor in Table N1102.1.2.

TABLE N1102.1.3 (R402.1.3)

INSULATION MINIMUM R-VALUES AND FENESTRATION REQUIREMENTS BY COMPONENTa
CLIMATE ZONE FENESTRATION U-FACTORb, i SKYLIGHTb U-FACTOR GLAZED FENESTRATION SHGCb, e CEILING R-VALUE WOOD FRAME WALL R-VALUEg MASS WALL R-VALUEh FLOOR R-VALUE BASEMENTc,g WALL R-VALUE SLABd R-VALUE & DEPTH CRAWL SPACEc,g WALL R-VALUE
0 NR 0.75 0.25 30 13 or 0 & 10ci 3/4 13 0 0 0
1 NR 0.75 0.25 30 13 or 0 & 10ci 3/4 13 0 0 0
2 0.40 0.65 0.25 49 13 or 0 & 10ci 4/6 13 0 0 0
3 0.30 0.55 0.25 49 20 or 13 & 10cih or 0 & 15cih 8/13 19 5ci or 13f 10ci, 2 ft 5ci or 13f
4 except Marine 0.30 0.55 0.40 60 30 or 20 & 5cih or 13 & 10cih or 0 & 20cih 8/13 19 10ci or 13 10ci,
4 ft
10ci or 13
5 and Marine 4 0.30 0.55 0.40 60 30 or 20 & 5cih or 13 & 10cih or 0 & 20cih 13/17 30 15ci or 19 or 13 & 5ci 10ci, 4 ft 15ci or 19 or 13 & 5ci
6 0.30 0.55 NR 60 30 or 20 & 5cih or 13 & 10cih or 0 & 20cih 15/20 30 15ci or 19 or 13 & 5ci 10ci, 4 ft 15ci or 19 or 13 & 5ci
7 and 8 0.30 0.55 NR 60 30 or 20 & 5cih or 13 & 10cih or 0 & 20cih 19/21 38 15ci or 19 or 13 & 5ci 10ci, 4 ft 15ci or 19 or 13 & 5ci

For SI: 1 foot = 304.8 mm.
NR = Not Required.
ci = continuous insulation.

  1. R-values are minimums. U-factors and SHGC are maximums. Where insulation is installed in a cavity that is less than the label or design thickness of the insulation, the installed R-value of the insulation shall be not 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: In Climate Zones 0 through 3, skylights shall be permitted to be excluded from glazed fenestration SHGC requirements provided that the SHGC for such skylights does not exceed 0.30.

  3. "5ci or 13" means R-5 continuous insulation (ci) on the interior or exterior surface of the wall or R-13 cavity insulation on the interior side of the wall. "10ci or 13" means R-10 continuous insulation (ci) on the interior or exterior surface of the wall or R-13 cavity insulation on the interior side of the wall. "15ci or 19 or 13 + 5ci" means R-15 continuous insulation (ci) on the interior or exterior surface of the wall; or R-19 cavity insulation on the interior side of the wall; or R-13 cavity insulation on the interior of the wall in addition to R-5 continuous insulation on the interior or exterior surface of the wall.
  4. R-5 insulation shall be provided under the full slab area of a heated slab in addition to the required slab edge insulation R-value for slabs, as indicated in the table. The slab-edge insulation for heated slabs shall not be required to extend below the slab.
  5. There are no SHGC requirements in the Marine Zone.
  6. Basement wall insulation shall not be required in Warm Humid locations as defined by Figure N1101.7 and Table N1101.7.
  7. The first value is cavity insulation; the second value is continuous insulation. Therefore, as an example, "13 + 5" means R-13 cavity insulation plus R-5 continuous insulation.
  8. Mass walls shall be in accordance with Section N1102.2.5. The second R-value applies where more than half of the insulation is on the interior of the mass wall.
  9. A maximum U-factor of 0.32 shall apply in Climate Zones 3 through 8 to vertical fenestration products installed in buildings located either:

    1. Above 4,000 feet in elevation, or
    2. In windborne debris regions where protection of openings is required by Section R301.2.1.2.
Cavity insulation alone shall be used to determine compliance with the cavity insulation R-value requirements in Table N1102.1.3. Where cavity insulation is installed in multiple layers, the R-values of the cavity insulation layers shall be summed to determine compliance with the cavity insulation R-value requirements. The manufacturer's settled R-value shall be used for blown-in insulation. Continuous insulation (ci) alone shall be used to determine compliance with the continuous insulation R-value requirements in Table N1102.1.3. Where continuous insulation is installed in multiple layers, the R-values of the continuous insulation layers shall be summed to determine compliance with the continuous insulation R-value requirements. Cavity insulation R-values shall not be used to determine compliance with the continuous insulation R-value requirements in Table N1102.1.3. 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 N1102.1.3, the manufacturer's labeled R-value for insulated siding shall be reduced by R-0.6.
Where the total building thermal envelope UA, the sum of U-factor times assembly area, is less than or equal to the total UA resulting from multiplying the U-factors in Table N1102.1.2 by the same assembly area as in the proposed building, the building shall be considered to be in compliance with Table N1102.1.2. The UA calculation shall be performed using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. In addition to UA compliance, the SHGC requirements of Table N1102.1.2 and the maximum fenestration U-factors of Section N1102.5 shall be met.
In addition to the requirements of Section N1102.1, insulation shall meet the specific requirements of Sections N1102.2.1 through N1102.2.12.
Where Section N1102.1.3 requires R-49 insulation in the ceiling or attic, installing R-38 insulation over 100 percent of the ceiling or attic area requiring insulation shall 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. Where Section N1102.1.2 requires R-60 insulation in the ceiling or attic, installing R-49 over 100 percent of the ceiling or attic area requiring insulation shall satisfy the requirement for R-60 insulation wherever the full height of uncompressed R-49 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the insulation and fenestration criteria in Section N1102.1.3 and the Total UA alternative in Section N1102.1.5.
Where Section N1102.1.3 requires insulation R-values greater than R-30 in the interstitial space above a ceiling and below the structural roof deck, and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation R-value for such roof/ceiling assemblies shall be R-30. Insulation shall extend over the top of the wall plate to the outer edge of such plate and shall not be compressed. This reduction of insulation from the requirements of Section N1102.1.3 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 Total UA alternative in Section N1102.1.5.
For air-permeable insulation in vented attics, a baffle shall be installed adjacent to soffit and eave vents. Baffles shall maintain a net free area opening equal to 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. The baffle shall be installed to the outer edge of the exterior wall top plate so as to provide maximum space for attic insulation coverage over the top plate. Where soffit venting is not continuous, baffles shall be installed continuously to prevent ventilation air in the eave soffit from bypassing the baffle.
Access hatches and doors from conditioned to unconditioned spaces such as attics and crawl spaces shall be insulated to the same R-value required by Table N1102.1.3 for the wall or ceiling in which they are installed.

Exceptions:

  1. Vertical doors providing access from conditioned spaces to unconditioned spaces that comply with the fenestration requirements of Table N1102.1.3 based on the applicable climate zone specified in Chapter 3.
  2. Horizontal pull-down, stair-type access hatches in ceiling assemblies that provide access from conditioned to unconditioned spaces in Climate Zones 0 through 4 shall not be required to comply with the insulation level of the surrounding surfaces provided that the hatch meets all of the following:

    2.1. The average U-factor of the hatch shall be less than or equal to U-0.10 or have an average insulation R-value of R-10 or greater.

    2.2. Not less than 75 percent of the panel area shall have an insulation R-value of R-13 or greater.

    2.3. The net area of the framed opening shall be less than or equal to 13.5 square feet (1.25 m2).

    2.4. The perimeter of the hatch edge shall be weatherstripped.

The reduction shall not apply to the total UA alternative in Section N1102.1.5.
Vertical or horizontal access hatches and doors from conditioned spaces to unconditioned spaces such as attics and crawl spaces shall be weatherstripped. Access that prevents damaging or compressing the insulation shall be provided to all equipment. Where loose-fill insulation is installed, a wood-framed or equivalent baffle, retainer, or dam shall be installed to prevent loose-fill insulation from spilling into living space, from higher to lower sections of the attic, and from attics covering conditioned spaces to unconditioned spaces. The baffle or retainer shall provide a permanent means of maintaining the installed R-value of the loose-fill insulation.

Mass walls where used as a component of the building thermal envelope shall be one of the following:

  1. Above-ground walls of concrete block, concrete, insulated concrete form, masonry cavity, brick but not brick veneer, adobe, compressed earth block, rammed earth, solid timber, mass timber or solid logs.
  2. Any wall having a heat capacity greater than or equal to 6 Btu/ft2 × °F (123 kJ/m2 × K).
Steel-frame ceilings, walls, and floors shall comply with the insulation requirements of Table N1102.2.6 or the U-factor requirements of Table N1102.1.2. 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-VALUES
WOOD FRAME R-VALUE REQUIREMENT COLD-FORMED STEEL-FRAME
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-frame Wall, 16 inches on center
R-13 R-13 + 4.2 or R-21 + 2.8 or R-0 + 9.3 or R-15 + 3.8 or R-21 + 3.1
R-13 + 5 R-0 +15 or R-13 + 9 or R-15 + 8.5 or R-19 + 8 or R-21 + 7
R-13 + 10 R-0 + 20 or R-13 + 15 or R-15 + 14 or R-19 + 13 or R-21 + 13
R-20 R-0 + 14.0 or R-13 + 8.9 or R-15 + 8.5 or R-19 + 7.8 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-frame Wall, 24 inches on center
R-13 R-0 + 9.3 or R-13 + 3.0 or R-15 + 2.4
R-13 + 5 R-0 + 15 or R-13 + 7.5 or R-15 + 7 or R-19 + 6 or R-21 + 6
R-13 + 10 R-0 + 20 or R-13 + 13 or R-15 + 12 or R-19 + 11 or R-21 + 11
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

For SI:  1 inch = 25.4 mm.

  1. The first value is cavity insulation R-value; the second value is continuous insulation R-value. Therefore, for example, "R-30 + 3" means R-30 cavity insulation plus R-3 continuous insulation.
  2. Insulation exceeding the height of the framing shall cover the framing.

Floor cavity insulation shall comply with one of the following:

  1. Insulation shall be installed to maintain permanent contact with the underside of the subfloor decking in accordance with manufacturer instructions to maintain required R-value or readily fill the available cavity space.
  2. Floor framing cavity insulation shall be permitted to be in contact with the top side of sheathing separating the cavity and the unconditioned space below. Insulation shall extend from the bottom to the top of all perimeter floor framing members and the framing members shall be air sealed.
  3. A combination of cavity and continuous insulation shall be installed so that the cavity insulation is in contact with the top side of the continuous insulation that is installed on the underside of the floor framing separating the cavity and the unconditioned space below. The combined R-value of the cavity and continuous insulation shall equal the required R-value for floors. Insulation shall extend from the bottom to the top of all perimeter floor framing members and the framing members shall be air sealed.
Basement walls shall be insulated in accordance with Table N1102.1.3.

Exception: Basement walls associated with unconditioned basements where all of the following requirements are met:

  1. The floor overhead, including the underside stairway stringer leading to the basement, is insulated in accordance with Section N1102.1.3 and applicable provisions of Sections N1102.2 and N1102.2.7.
  2. There are no uninsulated duct, domestic hot water or hydronic heating surfaces exposed to the basement.
  3. There are no HVAC supply or return diffusers serving the basement.
  4. The walls surrounding the stairway and adjacent to conditioned space are insulated in accordance with Section N1102.1.3 and applicable provisions of Section N1102.2.
  5. The door(s) leading to the basement from conditioned spaces are insulated in accordance with Section N1102.1.3 and applicable provisions of Section N1102.2, and weatherstripped in accordance with Section N1102.4
  6. The building thermal envelope separating the basement from adjacent conditioned spaces complies with Section N1102.4.
Where basement walls are insulated, the insulation shall be installed from the top of the basement wall down to 10 feet (3048 mm) below grade or to the basement floor, whichever is less.

Slab-on-grade floors with a floor surface less than 12 inches (305 mm) below grade shall be insulated in accordance with Table N1102.1.3.

Exception: Slab-edge insulation is not required in jurisdictions designated by the code official as having a very heavy termite infestation.

Where installed, 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 extend the distance provided in Table N1102.1.3 or the distance of the proposed design, as applicable, 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.
Crawl space walls shall be insulated in accordance with Table N1102.1.3.

Exception: Crawl space walls associated with a crawl space that is vented to the outdoors and the floor overhead is insulated in accordance with Table N1102.1.3 and Section N1102.2.7.

Where crawl space wall insulation is installed, it shall be permanently fastened to the wall and shall extend downward from the floor to the finished grade elevation and then vertically or horizontally for not less than 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. 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 walls and shall be attached to the stem walls.
Insulation shall not be required on the horizontal portion of a foundation that supports a masonry veneer.

Sunrooms enclosing conditioned space and heated garages shall meet the insulation requirements of this code.

Exception: For sunrooms and heated garages provided with thermal isolation, and enclosing conditioned space, the following exceptions to the insulation requirements of this code shall apply:

  1. The minimum ceiling insulation R-values shall be R-19 in Climate Zones 0 through 4 and R-24 in Climate Zones 5 through 8.
  2. The minimum wall insulation R-value shall be R-13 in all climate zones. Walls separating a sunroom or heated garage with thermal isolation from conditioned space shall comply with the building thermal envelope requirements of this code.
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 that 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 be prohibited.

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

Not greater than 15 square feet (1.4 m2) of glazed fenestration per dwelling unit shall be exempt from the U-factor and SHGC requirements in Section N1102.1.2. This exemption shall not apply to the Total UA alternative in Section N1102.1.5.
One side-hinged opaque door assembly not greater than 24 square feet (2.22 m2) in area shall be exempt from the U-factor requirement in Section N1102.1.2. This exemption shall not apply to the and the Total UA alternative in Section N1102.1.5.

Sunrooms and heated garages enclosing conditioned space shall comply with the fenestration requirements of this code.

Exception: In Climate Zones 2 through 8, for sunrooms and heated garages with thermal isolation and enclosing conditioned space, the fenestration U-factor shall not exceed 0.45 and the skylight U-factor shall not exceed 0.70.

New fenestration separating a sunroom or heated garages with thermal isolation from conditioned space shall comply with the building thermal envelope requirements of this code.

The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections N1102.4.1 through N1102.4.5.
The building thermal envelope shall comply with Sections N1102.4.1.1 through N1102.4.1.3. The sealing methods between dissimilar materials shall allow for differential expansion and contraction.
The components of the building thermal envelope as indicated in Table N1102.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria indicated in Table N1102.4.1.1, as applicable to the method of construction. Where required by the code official, an approved third party shall inspect all components and verify compliance.

TABLE N1102.4.1.1 (R402.4.1.1)

AIR BARRIER, AIR SEALING AND INSULATION INSTALLATIONa
COMPONENT AIR BARRIER CRITERIA INSULATION INSTALLATION CRITERIA
General requirements A continuous air barrier shall be installed in the building envelope. Air-permeable insulation shall not be used as a sealing material.
Breaks or joints in the air barrier shall be sealed.
Ceiling/attic The air barrier in any dropped ceiling or soffit shall be aligned with the insulation and any gaps in the air barrier shall be sealed. The insulation in any dropped ceiling/soffit shall be aligned with the air barrier.
Access openings, drop-down stairs or knee wall doors to unconditioned attic spaces shall be sealed.
Walls The junction of the foundation and sill plate 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, R-value, of not less than R-3 per inch. Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and in continuous alignment with the air barrier.
The junction of the top plate and the top of exterior walls shall be sealed.
Knee walls shall be sealed.
Windows, skylights and doors The space between framing and skylights, and the jambs of windows and doors, shall be sealed.

Rim joists Rim joists shall include an exterior air barrier.b Rim joists shall be insulated so that the insulation maintains permanent contact with the exterior rim board.b
The junctions of the rim board to the sill plate and the rim board to the subfloor shall be air sealed.
Floors including cantilevered floors and floors above garages. 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. Alternatively, floor framing cavity insulation shall be in contact with the top side of sheathing or continuous insulation installed on the underside of floor framing; and extending from the bottom to the top of all perimeter floor framing members.
Basement crawl space and slab foundations Exposed earth in unvented crawl spaces shall be covered with a Class I Vapor retarder/air barrier in accordance with Section R402.2.10.  Crawl space insulation, where provided instead of floor insulation, shall be installed in accordance with Section R402.2.10.
Penetrations through concrete foundation walls and slabs shall be air sealed. Conditioned basement foundation wall insulation shall be installed in accordance with Section R402.2.8.1.
Class 1 vapor retarders shall not be used as an air barrier on below-grade walls and shall be installed in accordance with Section R702.7. Slab-on-grade floor insulation shall be installed in accordance with Section R402.2.10.
Shafts, penetrations Duct and flue shafts and other similar penetrations to exterior or unconditioned space shall be sealed to allow for expansion, contraction and mechanical vibration.

Insulation shall be fitted tightly around utilities passing through shafts and penetrations in the building thermal envelope to maintain required R-value.

Utility penetrations of the air barrier shall be caulked, gasketed or otherwise sealed and shall allow for expansion, contraction of materials and mechanical vibration.
Narrow cavities

Narrow cavities of 1 inch or less that are not able to be insulated shall be air sealed.

Batts to be installed in narrow cavities shall be cut to fit or narrow cavities shall be filled with insulation that on installation readily conforms to the available cavity space.
Garage separation Air sealing shall be provided between the garage and conditioned spaces.

Insulated portions of the garage separation assembly shall be installed in accordance with Sections R303 and R402.2.7. 

Recessed lighting Recessed light fixtures installed in the building thermal envelope shall be air sealed in accordance with Section R402.4.5. Recessed light fixtures installed in the building thermal envelope shall be airtight and IC rated, and shall be buried or surrounded with insulation.
Plumbing, wiring or other obstructions

All holes created by wiring, plumbing or other obstructions in the air barrier assembly shall be air sealed.

Insulation shall be installed to fill the available space and surround wiring, plumbing or other obstructions, unless the required R-value can be met by installing insulation and air-barrier systems completely to the exterior side of the obstructions.
Shower/tub on exterior wall The air barrier installed at exterior walls adjacent to showers and tubs shall separate the wall from the shower or tub. Exterior walls adjacent to showers and tubs shall be insulated.
Electrical/phone box on exterior walls The air barrier shall be installed behind electrical and communication boxes. Alternatively, air-sealed boxes shall be installed.

HVAC register boots HVAC supply and return register boots that penetrate building thermal envelope shall be sealed to the subfloor, wall covering or ceiling penetrated by the boot.

Concealed sprinklers Where 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.

For SI: 1 inch = 25.4 mm.

  1. Inspection of log walls shall be in accordance with the provisions of ICC 400.
  2. Air barrier and insulation full enclosure is not required in unconditioned/ventilated attic spaces and at rim joists.

The building or dwelling unit shall be tested for air leakage. The maximum air leakage rate for any building or dwelling unit under any compliance path shall not exceed 5.0 air changes per hour or 0.28 cubic feet per minute (CFM) per square foot [0.0079 m3/(s × m2)] of dwelling unit enclosure area. Testing shall be conducted in accordance with ANSI/RESNET/ICC 380, ASTM E779 or ASTM E1827 and reported at a pressure of 0.2 inch 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 have been sealed.

Exception: For heated, attached private garages and heated, detached private garages accessory to one- and two-family dwellings and townhouses not more than three stories above grade plane in height, building envelope tightness and insulation installation shall be considered acceptable where the items in Table N1102.4.1.1, applicable to the method of construction, are field verified. Where required by the code official, an approved third party independent from the installer shall inspect both air barrier and insulation installation criteria. Heated, attached private garage space and heated, detached private garage space shall be thermally isolated from all other conditioned spaces in accordance with Sections N1102.2.12 and N1102.3.5, as applicable.

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, where installed at the time of the test, shall be open.
  4. Exterior or interior terminations for continuous ventilation systems shall be sealed.
  5. Heating and cooling systems, where installed at the time of the test, shall be turned off.
  6. Supply and return registers, where installed at the time of the test, shall be fully open.

Exception: When testing individual dwelling units, an air leakage rate not exceeding 0.30 cubic feet per minute per square foot [0.008 m3/(s × m2)] of the dwelling unit enclosure area, tested in accordance with ANSI/RESNET/ICC 380, ASTM E779 or ASTM E1827 and reported at a pressure of 0.2 inch water gauge (50 Pa), shall be permitted in all climate zones for:

  1. Attached single- and multiple-family building dwelling units.
  2. Buildings or dwelling units that are 1,500 square feet (139.4 m2) or smaller.
Mechanical ventilation shall be provided in accordance with Section M1505 of this code or Section 403.3.2 of the International Mechanical Code, as applicable, or with other approved means of ventilation
Where complying with Section N1101.13.1, the building or dwelling unit shall have an air leakage rate not exceeding 5.0 air changes per hour in Climate Zones 0, 1 and 2, and 3.0 air changes per hour in Climate Zones 3 through 8, when tested in accordance with Section N1102.4.1.2.
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.

Windows, skylights and sliding glass doors shall have an air infiltration rate of not greater than 0.3 cfm per square foot (1.5 L/s/m2), and for swinging doors not greater than 0.5 cfm per square foot (2.6 L/s/m2), when tested in accordance with 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-built windows, skylights and doors.

In Climate Zones 3 through 8, where open-combustion airducts 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 that is isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table N1102.1.3, 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 an R-value of not less than 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.
Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. Recessed luminaires shall be IC-rated and labeled as having an air leakage rate of not greater than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E283 at a pressure differential of 1.57 psf (75 Pa). Recessed luminaires shall be sealed with a gasket or caulked between the housing and the interior wall or ceiling covering.
Electrical and communication outlet boxes installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. Electrical and communication outlet boxes shall be tested in accordance with NEMA OS 4, Requirements for Air-Sealed Boxes for Electrical and Communication Applications, and shall have an air leakage rate of not greater than 2.0 cubic feet per minute (0.944 L/s) at a pressure differential of 1.57 psf (75 Pa). Electrical and communication outlet boxes shall be marked "NEMA OS 4" or "OS 4" in accordance with NEMA OS 4. Electrical and communication outlet boxes shall be installed per the manufacturer's instructions and with any supplied components required to achieve compliance with NEMA OS 4.

The area-weighted average maximum fenestration U-factor permitted using tradeoffs from Section N1102.1.5 or N1105 shall be 0.48 in 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 tradeoffs from Section N1105 in Climate Zones 0 through 3 shall be 0.40.

Exception: The maximum U-factor and solar heat gain coefficient (SHGC) for fenestration shall not be required in storm shelters complying with ICC 500.

Not less than one thermostat shall be provided for each separate heating and cooling system.
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 and different days of the week. This thermostat shall include the capability to set back or temporarily operate the system to maintain zone temperatures of not less than 55°F (13°C) to not greater than 85°F (29°C). The thermostat shall be programmed initially by the manufacturer with a heating temperature setpoint of not greater than 70°F (21°C) and a cooling temperature setpoint of not less than 78°F (26°C).
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.
The manufacturer shall equip each gas, oil and electric boiler (other than a boiler equipped with a tankless domestic water heating coil) with automatic means of adjusting the water temperature supplied by the boiler to ensure incremental change of the inferred heat load will cause an incremental change in the temperature of the water supplied by the boiler. This can be accomplished with outdoor reset, indoor reset or water temperature sensing.
Ducts and air handlers shall be installed in accordance with Sections N1103.3.1 through N1103.3.7.
Supply and return ducts located outside conditioned space shall be insulated to an R-value of not less than R-8 for ducts 3 inches (76 mm) in diameter and larger and not less than R-6 for ducts smaller than 3 inches (76 mm) in diameter. Ducts buried beneath a building shall be insulated as required by this section or have an equivalent thermal distribution efficiency. Underground ducts utilizing the thermal distribution efficiency method shall be listed and labeled to indicate the R-value equivalency.

For ductwork to be considered inside a conditioned space, it shall comply with one of the following:

  1. The duct system is located completely within the continuous air barrier and within the building thermal envelope.
  2. Ductwork in ventilated attic spaces is buried within ceiling insulation in accordance with Section N1103.3.3 and all of the following conditions exist:

    2.1. The air handler is located completely within the continuous air barrier and within the building thermal envelope.

    2.2. The duct leakage, as measured either by a rough-in test of the ducts or a post-construction total system leakage test to outside the building thermal envelope in accordance with Section N1103.3.6, is less than or equal to 1.5 cubic feet per minute (42.5 L/min) per 100 square feet (9.29 m2) of conditioned floor area served by the duct system.

    2.3. The ceiling insulation R-value installed against and above the insulated duct is greater than or equal to the proposed ceiling insulation R-value, less the R-value of the insulation on the duct.

  3. Ductwork in floor cavities located over unconditioned space shall have the following:

    3.1. A continuous air barrier installed between unconditioned space and the duct.

    3.2. Insulation installed in accordance with Section N1102.2.7.

    3.3. A minimum R-19 insulation installed in the cavity width separating the duct from unconditioned space.

  4. Ductwork located within exterior walls of the building thermal envelope shall have the following:

    4.1. A continuous air barrier installed between unconditioned space and the duct.

    4.2. Minimum R-10 insulation installed in the cavity width separating the duct from the outside sheathing.

    4.3. The remainder of the cavity insulation fully insulated to the drywall side.

Where supply and return air ducts are partially or completely buried in ceiling insulation, such ducts shall comply with all of the following:

  1. The supply and return duct shall have an insulation R-value not less than R-8.
  2. At all points along each duct, the sum of the ceiling insulation R-values against and above the top of the duct, and against and below the bottom of the duct shall be not less than R-19, excluding the R-value of the duct insulation.
  3. In Climate Zones 0A, 1A, 2A and 3A, the supply ducts shall be completely buried within ceiling insulation, insulated to an R-value of not less than R-13 and in compliance with the vapor retarder requirements of Section M1601.4.6.

    Exception: Sections of the supply duct that are less than 3 feet (914 mm) from the supply outlet shall not be required to comply with these requirements.

Where using the Total Building Performance Compliance Option in accordance with Section N1101.13.2, sections of ducts that are installed in accordance with Section N1103.3.3, located directly on or within 5.5 inches (140 mm) of the ceiling, surrounded with blown-in attic insulation having an R-value of R-30 or greater and located such that the top of the duct is not less than 3.5 inches (89 mm) below the top of the insulation, shall be considered as having an effective duct insulation R-value of R-25.
Ducts, air handlers and filter boxes shall be sealed. Joints and seams shall comply with Section M1601.4.1.
Air handlers shall have a manufacturer's designation for an air leakage of not greater than 2 percent of the design airflow rate when tested in accordance with ASHRAE 193.

Ducts shall be pressure tested in accordance with ANSI/RESNET/ICC 380 or ASTM E1554 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. 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 for ducts serving heating, cooling or ventilation systems that are not integrated with ducts serving heating or cooling systems.

The total leakage of the ducts, where measured in accordance with Section N1103.3.5, shall be as follows:

  1. Rough-in test: The total leakage shall be less than or equal to 4.0 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 3.0 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 4.0 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
  3. Test for ducts within thermal envelope: Where all ducts and air handlers are located entirely within the building thermal envelope, total leakage shall be less than or equal to 8.0 cubic feet per minute (226.6 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
Building framing cavities shall not be used as ducts or plenums.
Mechanical system piping capable of carrying fluids greater than 105°F (41°C) or less than 55°F (13°C) shall be insulated to an R-value of not less than R-3.
Piping insulation exposed to weather shall be protected from damage, including that caused by sunlight, moisture, equipment maintenance and wind. The protection shall provide shielding from solar radiation that can cause degradation of the material. Adhesive tape shall be prohibited.
Energy conservation measures for service hot water systems shall be in accordance with Sections N1103.5.1 through N1103.5.3.
Heated water circulation systems shall be in accordance with Section N1103.5.1.1. Heat trace temperature maintenance systems shall be in accordance with Section N1103.5.1.2. Automatic controls, temperature sensors and pumps shall be in a location with access. Manual controls shall be in a location with ready access.
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 thermosyphon circulation systems shall be prohibited. Controls for circulating hot water system pumps 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. The controls shall limit the temperature of the water entering the cold water piping to not greater than 104°F (40°C).
Where installed, demand recirculation water systems shall have controls that 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.
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.

Insulation for service hot water piping with a thermal resistance, R-value, of not less than R-3 shall be applied to the following:

  1. Piping 3/4 inch (19 mm) and larger in nominal diameter located inside the conditioned space.
  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 circulation and recirculation systems other than cold water pipe return demand recirculation systems.
Where installed, drain water heat recovery units shall comply with CSA B55.2. Drain water heat recovery units shall be tested in accordance with CSA B55.1. 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 buildings complying with Section N1102.4.1 shall be provided with ventilation that complies with the requirements of Section M1505 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.
Dwelling units shall be provided with a heat recovery or energy recovery ventilation system in Climate Zones 7 and 8. The system shall be balanced with a minimum sensible heat recovery efficiency of 65 percent at 32°F (0°C) at a flow greater than or equal to the design airflow.
Fans used to provide whole-dwelling mechanical ventilation shall meet the efficacy requirements of Table N1103.6.2 at one or more rating points. Fans shall be tested in accordance with HVI 916 and listed. The airflow shall be reported in the product listing or on the label. Fan efficacy shall be reported in the product listing or shall be derived from the input power and airflow values reported in the product listing or on the label. Fan efficacy for fully ducted HRV, ERC, balanced and in-line fans shall be determined at a static pressure of not less than 0.2 inch water column (49.82 Pa). Fan efficacy for ducted range hoods, bathroom, and utility room fans shall be determined at a static pressure of not less than 0.1 inch water column (24.91 Pa).

TABLE N1103.6.2 ( R403.6.2)

WHOLE-DWELLING MECHANICAL VENTILATION SYSTEM FAN EFFICACYa
FAN LOCATION AIRFLOW RATE MINIMUM (CFM) MINIMUM EFFICACY (CFM/WATT)
HRV, ERV Any 1.2 cfm/watt
In-line supply or exhaust fan Any 3.8 cfm/watt
Other exhaust fan < 90 2.8 cfm/watt
Other exhaust fan ≥ 90 3.5 cfm/watt
Air-handler that is integrated to tested and listed HVAC equipment Any 1.2 cfm/watt

For SI: 1 cubic foot per minute = 28.3 L/min.

  1. Design outdoor airflow rate/watts of fan used.
Mechanical ventilation systems shall be tested and verified to provide the minimum ventilation flow rates required by Section N1103.6. Testing shall be performed according to the ventilation equipment manufacturer's instructions, or by using a flow hood or box, flow grid, or other airflow measuring device at the mechanical ventilation fan's inlet terminals or grilles, outlet terminals or grilles, or in the connected ventilation ducts. 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.

Exception: Kitchen range hoods that are ducted to the outside with 6-inch (152 mm) or larger duct and not more than one 90-degree (1.57 rad) elbow or equivalent in the duct run.

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.
Systems serving multiple dwelling units shall comply with Sections C403 and C404 of the International Energy Conservation Code—Commercial Provisions instead of Section N1103.
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 greater than 50°F (10°C) and precipitation is not falling, and an automatic or manual control that will allow shutoff when the outdoor temperature is greater than 40°F (4.8°C).
The energy consumption of pools and permanent spas shall be controlled by the requirements in Sections N1103.10.1 through N1103.10.3.
The electric power to heaters shall be controlled by an on-off switch that is an integral part of the heater mounted on the exterior of the heater in a location with ready access, 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.

Time switches or other control methods that can automatically turn heaters and pump motors 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.

Outdoor heated pools and outdoor permanent spas shall be provided with a vapor-retardant cover or other approved vapor-retardant means.

Exception: Where more than 75 percent of the energy for heating, computed over an operation season of not fewer than 3 calendar months, is from a heat pump or an on-site renewable energy system, covers or other vapor-retardant means shall not be required.

The energy consumption of electric-powered portable spas shall be controlled by the requirements of APSP 14.
Where installed, the energy consumption of residential swimming pools and permanent residential spas shall be controlled in accordance with the requirements of APSP 15.
All permanently installed lighting fixtures, excluding kitchen appliance lighting fixtures, shall contain only high-efficacy lighting sources.
Connected exterior lighting for Group R-2, R-3 and R-4 buildings shall comply with Section C405.4 of the International Energy Conservation Code—Commercial Provisions.

Exceptions:

  1. Detached one- and two-family dwellings.
  2. Townhouses.
  3. Solar-powered lamps not connected to any electrical service.
  4. Luminaires controlled by a motion sensor.
Fuel gas lighting systems shall not have continuously burning pilot lights.
Permanently installed lighting fixtures shall be controlled with a dimmer, an occupant sensor control or another control that is installed or built into the fixture.

Exception: Lighting controls shall not be required for the following:

  1. Bathrooms.
  2. Hallways.
  3. Exterior lighting fixtures.
  4. Lighting designed for safety or security.
Where the total permanently installed exterior lighting power is greater than 30 watts, the permanently installed exterior lighting shall comply with the following:
  1. Lighting shall be controlled by a manual on and off switch that permits automatic shut-off actions.

    Exception: Lighting serving multiple dwelling units.

  2. Lighting shall be automatically shut off when daylight is present and satisfies the lighting needs.
  3. Controls that override automatic shut-off actions shall not be allowed unless the override automatically returns automatic control to its normal operation within 24 hours.
This section establishes criteria for compliance using total building performance analysis. Such analysis shall include heating, cooling, mechanical ventilation and service water-heating energy only.

Compliance based on total building performance requires that a proposed design meets all of the following: 

  1. The requirements of the sections indicated within Table N1105.2.
  2. The building thermal envelope shall be greater than or equal to levels of efficiency and solar heat gain coefficients in Table R402.1.1 or R402.1.3 of the 2009 International Energy Conservation Code.
  3. 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 code official, such as the Department of Energy, Energy Information Administration's State Energy Data System Prices and Expenditures reports. Code 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 or Btu per square foot 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.

TABLE N1105.2 (R405.2)

REQUIREMENTS FOR TOTAL BUILDING PERFORMANCE
SECTIONa TITLE
General
N1101.13.5 Additional energy efficiency
N1101.14 Certificate
Building Thermal Envelope
N1102.1.1 Vapor retarder
N1102.2.3 Eave baffle
N1102.2.4.1 Access hatches and doors
N1102.2.10.1 Crawl space wall insulation installation
N1102.4.1.1 Installation
N1102.4.1.2 Testing
N1102.5 Maximum fenestration U-factor and SHGC
Mechanical
N1103.1 Controls
N1103.3, including N1103.3.1, except Sections N1103.3.2, N1103.3.3 and N1103.3.6 Ducts
N1103.4 Mechanical system piping insulation
N1103.5.1 Heated water circulation and temperature maintenance systems
N1103.5.3 Drain water heat recovery units
N1103.6 Mechanical ventilation
N1103.7 Equipment sizing and efficiency rating
N1103.8 Systems serving multiple dwelling units
N1103.9 Snow melt system controls
N1103.10 Energy consumption of pools and spas
N1103.11 Portable spas
N1103.12 Residential pools and permanent residential spas
Electrical Power and Lighting Systems
N1104.1 Lighting equipment
N1104.2 Interior lighting controls
  1. Reference to a code section includes all the relative subsections except as indicated in the table.
Documentation of the software used for the performance design and the parameters for the building shall be in accordance with Sections N1105.3.1 through N1105.3.2.2.
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 shall generate a report that documents that the proposed design complies with Section N1105.3. A compliance report on the proposed design shall be submitted with the application for the building permit. Upon completion of the building, a confirmed compliance report based on the confirmed condition of the building shall be submitted to the code official before a certificate of occupancy is issued.

Compliance reports shall include information in accordance with Sections N1105.3.2.1 and N1105.3.2.2.

A compliance report submitted with the application for building permit shall include the following:

  1. Building street address, or other building site identification.
  2. The name of the individual performing the analysis and generating the compliance report.
  3. The name and version of the compliance software tool.
  4. Documentation of all inputs entered into the software used to produce the results for the reference design and/or the rated home.
  5. A certificate indicating that the proposed design complies with Section N1105.3. The certificate shall document the building components' energy specifications that are included in the calculation, including component-level insulation R-values or U-factors; duct system and building envelope air leakage testing assumptions; and the type and rated efficiencies of proposed heating, cooling, mechanical ventilation and service water-heating equipment to be installed. If on-site renewable energy systems will be installed, the certificate shall report the type and production size of the proposed system.
  6. When a site-specific report is not generated, the proposed design shall be based on the worst-case orientation and configuration of the rated home.

A compliance report submitted for obtaining the certificate of occupancy shall include the following:

  1. Building street address, or other building site identification.
  2. Declaration of the total building performance path on the title page of the energy report and the title page of the building plans.
  3. A statement, bearing the name of the individual performing the analysis and generating the report, indicating that the as-built building complies with Section N1105.3
  4. The name and version of the compliance software tool.
  5. A site-specific energy analysis report that is in compliance with Section N1105.3.
  6. A final confirmed certificate indicating compliance based on inspection, and a statement indicating that the confirmed rated design of the built home complies with Section N1105.3. The certificate shall report the energy features that were confirmed to be in the home, including component-level insulation R-values or U-factors; results from any required duct system and building envelope air leakage testing; and the type and rated efficiencies of the heating, cooling, mechanical ventilation and service water heating equipment installed.
  7. Where on-site renewable energy systems have been installed, the certificate shall report the type and production size of the installed system.
Calculations of the performance design shall be in accordance with Sections N1105.4.1 and N1105.4.2.
Except as specified by this section, the standard reference design and proposed design shall be configured and analyzed using identical methods and techniques.
The standard reference design and proposed design shall be configured and analyzed as specified by Table N1105.4.2(1). Table N1105.4.2(1) shall include, by reference, all notes contained in Table N1102.1.3.

TABLE N1105.4.2(1) [R405.4.2(1)]

SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS
BUILDING COMPONENT STANDARD REFERENCE DESIGN PROPOSED DESIGN
Above-grade walls Type: mass where the proposed wall is a mass wall; otherwise wood frame. As proposed
Gross area: same as proposed. As proposed
U-factor: as specified in Table N1102.1.2. 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: as specified in Table N1102.1.2, with the insulation layer on the interior side of the walls. As proposed
Above-grade floors Type: wood frame. As proposed
Gross area: same as proposed. As proposed
U-factor: as specified in Table N1102.1.2. As proposed
Ceilings Type: wood frame. As proposed
Gross area: same as proposed. As proposed
U-factor: as specified in Table N1102.1.2. 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 an aperture of 1 ft2 per 300 ft2 of 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 as specified in Table N1102.1.2. As proposed
Vertical fenestration other than opaque doors Total areah =

(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.

As proposed
Orientation: equally distributed to four cardinal compass orientations (N, E, S & W). As proposed
U-factor: as specified in Table N1102.1.2. As proposed
SHGC: as specified in Table N1102.1.2 except for climate zones without an SHGC requirement, the SHGC shall be equal to 0.40. As proposed
Interior shade fraction: 0.92 — (0.21 × SHGC for the standard reference design). Interior shade fraction:
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 The air leakage rate at a pressure of 0.2 inch w.g. (50 Pa) shall be Climate Zones 0 through 2: 5.0 air changes per hour.
Climate Zones 3 through 8: 3.0 air changes per hour.
The measured air exchange rate.a
The mechanical ventilation rate shall be in addition to the air leakage rate and shall be the same as in the proposed design, but not greater than 0.01 × CFA + 7.5 × (Nbr + 1)

where:

CFA = conditioned floor area, ft2.

Nbr = number of bedrooms.

The mechanical ventilation system type shall be the same as in the proposed design. Energy recovery shall not be assumed for mechanical ventilation.

The mechanical ventilation rateb shall be in addition to the air leakage rate and shall be as proposed.

Mechanical ventilation Where mechanical ventilation is not specified in the proposed design: None

Where mechanical ventilation is specified in the proposed design, the annual vent fan energy use, in units of kWh/yr, shall equal (1/ef) ×[0.0876 × CFA + 65.7 × (Nbr+1)]

where:

ef = the minimum fan efficacy, as specified in Table N1103.6.2, corresponding to the system type at a flow rate of 0.01 × CFA + 7.5 × (Nbr+1)

CFA = conditioned floor area, ft2.

Nbr = number of bedrooms.

As proposed
Internal gains IGain, in units of Btu/day per dwelling unit, shall equal 17,900 + 23.8 ×CFA + 4,104 × Nbr

where:

CFA = conditioned floor area, ft2.

Nbr = number of bedrooms.

Same as standard reference design.
Internal mass Internal mass for furniture and contents: 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 as specified in Table N1102.1.3, located on the interior side of the walls. As proposed
For other walls, ceilings, floors, and interior walls: wood frame construction. As proposed
Heating systemsd, e For other than electric heating without a heat pump: as proposed.

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, g As proposed.

Use, in units of gal/day = 25.5 + (8.5 × Nbr)

where:
Nbr = number of bedrooms.
As proposed

Use, in units of gal/day = 25.5 + (8.5 × Nbr) × (1 — HWDS)

where:

Nbr
= number of bedrooms.

HWDS = factor for the compactness of the hot water distribution system.
Compactness ratioi factor HWDS
1 story 2 or more stories  
> 60% > 30% 0
> 30% to ≤ 60% > 15% to ≤ 30% 0.05
> 15% to ≤ 30% > 7.5% to ≤ 15% 0.10
< 15% < 7.5% 0.15
Thermal distribution systems Duct insulation: in accordance with 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.

Duct location: same as proposed design.

Exception: For nonducted heating and cooling systems that do not have a fan, the standard reference design thermal distribution system efficiency (DSE) shall be 1. 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 inch w.g. (25 Pa).

Duct location: as proposed.




Duct insulation: as proposed.



As tested or, where not tested, as specified in Table N1105.4.2(2).
Thermostat Type: Manual, cooling temperature setpoint = 75°F;

Heating temperature setpoint = 72°F.
Same as standard reference design.
Dehumidistat Where a mechanical ventilation system with latent heat recovery is not specified in the proposed design:
None.
Where the proposed design utilizes a mechanical ventilation system with latent heat recovery:

Dehumidistat type: manual, setpoint = 60% relative humidity.

Dehumidifier: whole-dwelling with integrated energy factor = 1.77 liters/kWh.

Same as standard reference design.

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.

  1. 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.
  2. 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.
  3. Thermal storage element shall mean a component that is 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 shall be in the same room as fenestration that faces within 15 degrees (0.26 rad) of true south, or shall be connected to such a room with pipes or ducts that allow the element to be actively charged.
  4. 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.
  5. For a proposed design without a proposed heating system, a heating system having the prevailing federal minimum efficiency shall be assumed for both the standard reference design and proposed design.
  6. For a proposed design home without a proposed cooling system, an electric air conditioner having the prevailing federal minimum efficiency shall be assumed for both the standard reference design and the proposed design.
  7. For a proposed design with a nonstorage-type water heater, a 40-gallon storage-type water heater having the prevailing federal minimum energy factor for the same fuel as the predominant heating fuel type shall be assumed. For a proposed design without a proposed water heater, a 40-gallon storage-type water heater having 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.
  8. For residences with conditioned basements, R-2 and R-4 residences, and for 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.

  9. The factor for the compactness of the hot water distribution system is the ratio of the area of the rectangle that bounds the source of hot water and the fixtures that it serves (the "hot water rectangle") divided by the floor area of the dwelling.

    1. Sources of hot water include water heaters, or in multiple-family buildings with central water heating systems, circulation loops or electric heat traced pipes.
    2. The hot water rectangle shall include the source of hot water and the points of termination of all hot water fixture supply piping.
    3. The hot water rectangle shall be shown on the floor plans and the area shall be computed to the nearest square foot.
    4. Where there is more than one water heater and each water heater serves different plumbing fixtures and appliances, it is permissible to establish a separate hot water rectangle for each hot water distribution system and add the area of these rectangles together to determine the compactness ratio. 
    5. The basement or attic shall be counted as a story when it contains the water heater.
    6. Compliance shall be demonstrated by providing a drawing on the plans that shows the hot water distribution system rectangle(s), comparing the area of the rectangle(s) to the area of the dwelling and identifying the appropriate compactness ratio and HWDS factor.

TABLE N1105.4.2(2) [R405.4.2(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
  1. Default values this table are for untested distribution systems, which must still meet minimum requirements for duct system insulation.
  2. 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.
  3. 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.
  4. 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 N1105.5.1 through N1105.5.3.

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 N1103.7.
  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 proposed design component characteristics from Table N1105.4.2(1) determined by the analysis to provide compliance, along with their respective performance ratings such as R-value, U-factor, SHGC, HSPF, AFUE, SEER and EF.
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 code official shall be permitted to approve such 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.
Compliance based on the Energy Rating Index (ERI) requires that the rated design meet all of the following:
  1. The requirements of the sections indicated within Table N1106.2.
  2. Maximum ERI of Table N1106.5.

TABLE N1106.2 (R406.2)

REQUIREMENTS FOR ENERGY RATING INDEX
SECTIONa TITLE
General
N1101.13.5 Additional efficiency packages
N1101.14 Certificate
Building Thermal Envelope
N1102.1.1 Vapor retarder
N1102.2.3 Eave baffle
N1102.2.4.1 Access hatches and doors
N1102.2.10.1 Crawl space wall insulation installation
N1102.4.1.1 Installation
N1102.4.1.2 Testing
Mechanical
N1103.1 Controls
N1103.3 except Sections N1103.3.2, N1103.3.3 and N1103.3.6 Ducts
N1103.4 Mechanical system piping insulation
N1103.5.1 Heated water circulation and temperature maintenance systems
N1103.5.3 Drain water heat recovery units
N1103.6 Mechanical ventilation
N1103.7 Equipment sizing and efficiency rating
N1103.8 Systems serving multiple dwelling units
N1103.9 Snow melt system controls
N1103.10 Energy consumption of pools and spas
N1103.11 Portable spas
N1103.12 Residential pools and permanent residential spas
Electrical Power and Lighting Systems
N1104.1 Lighting equipment
N1104.2 Interior lighting controls
N1106.3 Building thermal envelope
  1. Reference to a code section includes all of the relative subsections except as indicated in the table.
Building and portions thereof shall comply with Section N1106.3.1 or N1106.3.2.
Where on-site renewable energy is not included for compliance using the ERI analysis of Section N1106.4, the proposed total building thermal envelope UA, which is sum of U-factor times assembly area, shall be less than or equal to the building thermal envelope UA using the prescriptive U-factors from Table N1102.1.2 multiplied by 1.15 in accordance with Equation 11-4. The area-weighted maximum fenestration SHGC permitted in Climate Zones 0 through 3 shall be 0.30.

(Equation 11-4)
Where on-site renewable energy is included for compliance using the ERI analysis of Section N1106.4, the building thermal envelope shall be greater than or equal to the levels of efficiency and SHGC in Table N1102.1.2, or Table R402.1.4 of the 2018 International Energy Conservation Code.

The Energy Rating Index (ERI) shall be determined in accordance with RESNET/ICC 301 except that the ERI reference design ventilation rate shall be in accordance with Equation 11-5.

(Equation 11-5)

Energy used to recharge or refuel a vehicle used for transportation on roads that are not on the building site shall not be included in the ERI reference design or the rated design. For compliance purposes, any reduction in energy use of the rated design associated with on-site renewable energy shall not exceed 5 percent of the total energy use.

Compliance based on an ERI analysis requires that the rated proposed design and confirmed built dwelling be shown to have an ERI less than or equal to the appropriate value indicated in Table N1106.5 when compared to the ERI reference design.

TABLE N1106.5 (R406.5)

MAXIMUM ENERGY RATING INDEX
CLIMATE ZONE ENERGY RATING INDEX
0—1 52
2 52
3 51
4 54
5 55
6 54
7 53
8 53
 
Verification of compliance with Section N1106 as outlined in Sections N1106.4 and N1106.6 shall be completed by an approved third party. Verification of compliance with Section N1106.2 shall be completed by the authority having jurisdiction or an approved third-party inspection agency in accordance with Section R105.4.
Documentation of the software used to determine the ERI and the parameters for the residential building shall be in accordance with Sections N1106.7.1 through N1106.7.4.
Software tools used for determining ERI shall be Approved Software Rating Tools in accordance with RESNET/ICC 301.
Compliance software tools shall generate a report that documents that the home and the ERI score of the rated design comply with Sections N1106.2, N1106.3 and N1106.4. Compliance documentation shall be created for the proposed design and shall be submitted with the application for the building permit. Confirmed compliance documents of the built dwelling unit shall be created and submitted to the code official for review before a certificate of occupancy is issued. Compliance reports shall include information in accordance with Sections N1106.7.2.1 and N1106.7.2.2.
Compliance reports submitted with the application for a building permit shall include the following:
  1. Building street address, or other building site identification.
  2. Declaration of ERI on the title page and on the building plans.
  3. The name of the individual performing the analysis and generating the compliance report.
  4. The name and version of the compliance software tool.
  5. Documentation of all inputs entered into the software used to produce the results for the reference design and/or the rated home.
  6. A certificate indicating that the proposed design has an ERI less than or equal to the appropriate score indicated in Table N1106.5 when compared to the ERI reference design. The certificate shall document the building component energy specifications that are included in the calculation, including: component level insulation R-values or U-factors; assumed duct system and building envelope air leakage testing results; and the type and rated efficiencies of proposed heating, cooling, mechanical ventilation and service water-heating equipment to be installed. If on-site renewable energy systems will be installed, the certificate shall report the type and production size of the proposed system.
  7. When a site-specific report is not generated, the proposed design shall be based on the worst-case orientation and configuration of the rated home.
A confirmed compliance report submitted for obtaining the certificate of occupancy shall be made site and address specific and include the following:
  1. Building street address or other building site identification.
  2. Declaration of ERI on the title page and on the building plans.
  3. The name of the individual performing the analysis and generating the report.
  4. The name and version of the compliance software tool.
  5. Documentation of all inputs entered into the software used to produce the results for the reference design and/or the rated home.
  6. A final confirmed certificate indicating that the confirmed rated design of the built home complies with Sections N1106.2 and N1106.4. The certificate shall report the energy features that were confirmed to be in the home, including: component-level insulation R-values or U-factors; results from any required duct system and building envelope air leakage testing; and the type and rated efficiencies of the heating, cooling, mechanical ventilation, and service water-heating equipment installed. Where on-site renewable energy systems have been installed on or in the home, the certificate shall report the type and production size of the installed system.
Where on-site renewable energy is included in the calculation of an ERI, one of the following forms of documentation shall be provided to the code official:
  1. Substantiation that the RECs associated with the on-site renewable energy are owned by, or retired on behalf of, the homeowner.
  2. A contract that conveys to the homeowner the RECs associated with the on-site renewable energy, or conveys to the homeowner an equivalent quantity of RECs associated with other renewable energy.

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.
Performance analysis tools meeting the applicable subsections of Section N1106 shall be approved. Documentation demonstrating the approval of performance analysis tools in accordance with Section N1106.7.1 shall be provided.
Where calculations require input values not specified by Sections N1102, N1103, N1104 and N1105, those input values shall be taken from RESNET/ICC 301.
This section establishes alternative criteria for residential buildings in the tropical region at elevations less than 2,400 feet (731.5 m) above sea level.
Compliance with this section requires the following:
  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 spaces has a solar heat gain coefficient (SHGC) 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 or ceiling has insulation with an R-value of R-15 or greater. Where attics are present, attics above the insulation are vented and attics below the insulation are unvented.
  7. Roof surfaces have a slope of not less than 1/4 unit vertical in 12 units horizontal (21-percent slope). The finished roof does not have water accumulation areas.
  8. Operable fenestration provides a ventilation area of 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.
This section establishes additional efficiency package options to achieve additional energy efficiency in accordance with Section N1101.13.5.
Additional efficiency package options for compliance with Section N1101.13.5 are set forth in Sections N1108.2.1 through N1108.2.5.
The total building thermal envelope UA, the sum of U-factor times assembly area, shall be less than or equal to 95 percent of the total UA resulting from multiplying the U-factors in Table N1102.1.2 by the same assembly area as in the proposed building. The UA calculation shall be performed in accordance with Section N1102.1.5. The area-weighted average SHGC of all glazed fenestration shall be less than or equal to 95 percent of the maximum glazed fenestration SHGC in Table N1102.1.2.
Heating and cooling equipment shall meet one of the following efficiencies:
  1. Greater than or equal to 95 AFUE natural gas furnace and 16 SEER air conditioner.
  2. Greater than or equal to 10 HSPF/16 SEER air source heat pump.
  3. Greater than or equal to 3.5 COP ground source heat pump. For multiple cooling systems, all systems shall meet or exceed the minimum efficiency requirements in this section and shall be sized to serve 100 percent of the cooling design load. For multiple heating systems, all systems shall meet or exceed the minimum efficiency requirements in this section and shall be sized to serve 100 percent of the heating design load.
The hot water system shall meet one of the following efficiencies:
  1. Greater than or equal to .82 EF fossil fuel service water-heating system.
  2. Greater than or equal to 2.0 EF electric service water-heating system.
  3. Greater than or equal to 0.4 solar fraction solar water-heating system.
The thermal distribution system shall meet one of the following efficiencies:
  1. 100 percent of ducts and air handlers located entirely within the building thermal envelope.
  2. 100 percent of ductless thermal distribution system or hydronic thermal distribution system located completely inside the building thermal envelope.
  3. 100 percent of duct thermal distribution system located in conditioned space as defined by Section N1103.3.2.
The measured air leakage rate shall be less than or equal to 3.0 ACH50, with either an Energy Recovery Ventilator (ERV) or Heat Recovery Ventilator (HRV) installed. Minimum HRV and ERV requirements, measured at the lowest tested net supply airflow, shall be greater than or equal to 75 percent Sensible Recovery Efficiency (SRE), less than or equal to 1.1 cubic feet per minute per watt (0.03 m3/min/watt) and shall not use recirculation as a defrost strategy. In addition, the ERV shall be greater than or equal to 50 percent Latent Recovery/Moisture Transfer (LRMT).
The provisions of Sections N1109 through N1113 shall control the alteration, repair, addition and change of occupancy of existing buildings and structures.
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. Unaltered portions of the existing building, or building supply system shall not be required to comply with this code.
Additions, alterations, repairs or changes of occupancy to, or relocation of, an existing building, building system or portion thereof shall comply with Section N1110, N1111N1112 or N1113, respectively, in this code. Changes where unconditioned space is changed to conditioned space shall comply with Section N1110.
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 compliance 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.
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.
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 that hazards to life, health or property are not created. Hazardous materials shall not be used where the code for new construction would not allow their use in buildings of similar occupancy, purpose and location.
Provisions of this chapter relating to the construction, repair, alteration, restoration and movement of structures, and change of occupancy shall not be mandatory for historic buildings provided that a report has been submitted to the building 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 does not use more energy than the existing building. Additions shall be in accordance with Section N1110.1 or N1110.3.

Any unconditioned or low energy space that is altered to become conditioned space shall be required to be brought into full compliance with this chapter.

Exceptions:

  1. 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.
  2. Where the Total 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 the Total UA generated for the existing building.
  3. Where complying in accordance with Section N1105 and 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. The addition and any alterations that are part of the project shall comply with Section N1105 in its entirety.

New building 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: New envelope assemblies are exempt from the requirements of Section N1102.4.1.2.

HVAC ducts newly installed as part of an addition shall comply with Section N1103.

Exception: Where ducts from an existing heating and cooling system are extended to an addition.

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.

Alterations to any building or structure shall comply with the requirements of the code for new construction, without requiring the unaltered portions of the existing building or building system to comply with this chapter. Alterations shall be such that the existing building or structure is not less conforming with the provisions of this chapter than the existing building or structure was prior to the alteration.

Alterations shall not create an unsafe or hazardous condition or overload existing building systems. Alterations shall be such that the existing building or structure does not use more energy than the existing building or structure prior to the alteration. Alterations to existing buildings shall comply with Sections N1111.1.1 through N1111.1.4.

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 N1102.2.12, N1102.3.1, N1102.3.2, N1102.4.3 and N1102.4.5.

Exception: The following alterations shall not be required to comply with the requirements for new construction provided that 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.
  3. Construction where the existing roof, wall or floor cavity is not exposed.
  4. Roof recover.
  5. 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.
  6. Surface-applied window film installed on existing single-pane fenestration assemblies to reduce solar heat gain provided that the code does not require the glazing or fenestration assembly to be replaced.
Where some or all of an existing fenestration unit is replaced with a new fenestration product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC as specified in Table N1102.1.3. Where more than one replacement fenestration unit is to be installed, an area-weighted average of the U-factor, SHGC or both of all replacement fenestration units shall be an alternative that can be used to show compliance.

HVAC ducts newly installed as part of an alteration shall comply with Section N1103.

Exception: Where ducts from an existing heating and cooling system are extended to an addition.

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 10 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.

Buildings, structures and parts thereof shall be repaired in compliance with Section N1109.3 and this section. Work on nondamaged components necessary for the required repair of damaged components shall be considered to be part of the repair and shall not be subject to the requirements for alterations in this chapter. Routine maintenance required by Section N1109.3, 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.

For the purposes of this code, the following shall be considered to be repairs:

  1. Glass-only replacements in an existing sash and frame.
  2. Roof repairs.
  3. Repairs where only the bulb, ballast or both within the existing luminaires in a space are replaced provided that the replacement does not increase the installed interior lighting power.

Any space that is converted to a dwelling unit or portion thereof from another use or occupancy shall comply 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 allowed by Section N1105.2.

Any unconditioned or low-energy space that is altered to become a conditioned space shall comply with Section N1108.
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