CODES

ADOPTS WITH AMENDMENTS:

International Residential Code 2015 (IRC 2015)

Copyright

Preface

Effective Use of the International Residential Code

Legislation

Part I ‒ Administrative

Chapter 1 Scope and Administration

Part II ‒ Definitions

Chapter 2 Definitions

Part III ‒ Building Planning and Construction

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Part IV ‒ Energy Conservation

Chapter 11 [RE] Energy Efficiency

Part V ‒ Mechanical

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment and Appliances

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Appliances, Equipment and Systems

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Thermal Energy Systems

Part VI ‒ Fuel Gas

Chapter 24 Fuel Gas

Part VII ‒ Plumbing

Chapter 25 Plumbing Administration

Chapter 25 THROUGH 33 PLUMBING

Chapter 26 General Plumbing Requirements

Chapter 27 Plumbing Fixtures

Chapter 28 Water Heaters

Chapter 29 Water Supply and Distribution

Chapter 30 Sanitary Drainage

Chapter 31 Vents

Chapter 32 Traps

Chapter 33 Storm Drainage

Part VIII ‒ Electrical

Chapter 34 General Requirements

Chapter 34 THROUGH 43: ELECTRICAL

Chapter 35 Electrical Definitions

Chapter 36 Services

Chapter 37 Branch Circuit and Feeder Requirements

Chapter 38 Wiring Methods

Chapter 39 Power and Lighting Distribution

Chapter 40 Devices and Luminaires

Chapter 41 Appliance Installation

Chapter 42 Swimming Pools

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

Part IX ‒ Referenced Standards

Chapter 44 Referenced Standards

Appendix A Sizing and Capacities of Gas Piping

Appendix A SIZING AND CAPACITIES OF GAS PIPING

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

Appendix B SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES, AND APPLIANCES LISTED FOR USE WITH TYPE B VENTS

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

Appendix C EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEMS

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

Appendix D RECOMMENDED PROCEDURE FOR SAFETY INSPECTION OF AN EXISTING APPLIANCE SYSTEMS

Appendix E Manufactured Housing Used as Dwellings

Appendix F Passive Radon Gas Controls

Appendix G Piping Standards for Various Applications

Appendix G PIPING STANDARDS FOR VARIOUS APPLICATIONS

Appendix H Patio Covers

Appendix I Private Sewage Disposal

Appendix J Existing Buildings and Structures

Appendix K Sound Transmission

Appendix L Permit Fees

Appendix L PERMIT FEES (see 801 CMR 4.00: Rates, as applicable)

Appendix M HOME DAY CARE—R-3 OCCUPANCY

Appendix M HOME DAY CARE – R-3 OCCPANCY

Appendix N Venting Methods

Appendix N VENTING METHODS

Appendix O Automatic Vehicular Gates

Appendix P Sizing of Water Piping System

Appendix P SIZING OF WATER PIPING SYSTEM

Appendix Q Reserved

Appendix Q

Appendix R Light Straw-Clay Construction

Appendix R LIGHT STRAW-CLAY CONSTRUCTION

Appendix S Strawbale Construction

Appendix S STRAWABLE CONSTRUCTION

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

Appendix T RECOMMENDED PROCEDURE FOR WORST-CASE TESTING OF ATMOSPHERIC VENTING SYSTEMS UNDER N1102.4 OR N1105 CONDITIONS ≤ 5 ACH50

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

Appendix AA Stretch Energy Code

(The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.)

a. pCi/L standard for picocuries per liter of radon gas. The U.S. Environmental Protection Agency (EPA) recommends that homes that measure 4 pCi/L and greater be mitigated.
The EPA and the U.S. Geological Survey have evaluated the radon potential in the United States and have developed a map of radon zones designed to assist building officials in deciding whether radonresistant features are applicable in new construction.
The map assigns each of the 3,141 counties in the United States to one of three zones based on radon potential. Each zone designation reflects the average short-term radon measurement that can be expected to be measured in a building without the implementation of radon-control methods. The radon zone designation of highest priority is Zone 1. Table AF101 lists the Zone 1 counties illustrated on the map. More detailed information can be obtained from state-specific booklets (EPA-402-R-93-021 through 070) available through State Radon Offices or from EPA Regional Offices.

FIGURE AF101 EPA MAP OF RADON ZONES




TABLE AF101(1) HIGH RADON-POTENTIAL (ZONE 1) COUNTIESa


ALABAMA CONNECTICUT Morgan Wabash Trego Hillsdale Watonwan
Calhoun Fairfield Moultrie Warren Wallace Jackson Wilkin
Clay Middlesex Ogle Washington Washington Kalamazoo Winona
Cleburne New Haven Peoria Wayne Wichita Lenawee Wright
Colbert New London Piatt Wells Wyandotte St. Joseph Yellow Medicine
Coosa GEORGIA Pike White KENTUCKY Washtenaw MISSOURI
Franklin Cobb Putnam Whitley Adair MINNESOTA Andrew
Jackson De Kalb Rock Island IOWA Allen Becker Atchison
Lauderdale Fulton Sangamon All Counties Barren Big Stone Buchanan
Lawrence Gwinnett Schuyler KANSAS Bourbon Blue Earth Cass
Limestone IDAHO Scott Atchison Boyle Brown Clay
Madison Benewah Stark Barton Bullitt Carver Clinton
Morgan Blaine Stephenson Brown Casey Chippewa Holt
Talladega Boise Tazewell Cheyenne Clark Clay Iron
CALIFORNIA Bonner Vermilion Clay Cumberland Cottonwood Jackson
Santa Barbara Boundary Warren Cloud Fayette Dakota Nodaway
Ventura Butte Whiteside Decatur Franklin Dodge Platte
COLORADO Camas Winnebago Dickinson Green Douglas MONTANA
Adams Clark Woodford Douglas Harrison Faribault Beaverhead
Arapahoe Clearwater INDIANA Ellis Hart Fillmore Big Horn
Baca Custer Adams Ellsworth Jefferson Freeborn Blaine
Bent Elmore Allen Finney Jessamine Goodhue Broadwater
Boulder Fremont Bartholomew Ford Lincoln Grant Carbon
Chaffee Gooding Benton Geary Marion Hennepin Carter
Cheyenne Idaho Blackford Gove Mercer Houston Cascade
Clear Creek Kootenai Boone Graham Metcalfe Hubbard Chouteau
Crowley Latah Carroll Grant Monroe Jackson Custer
Custer Lemhi Cass Gray Nelson Kanabec Daniels
Delta Shoshone Clark Greeley Pendleton Kandiyohi Dawson
Denver Valley Clinton Hamilton Pulaski Kittson Deer Lodge
Dolores ILLINOIS De Kalb Haskell Robertson Lac Qui Parle Fallon
Douglas Adams Decatur Hodgeman Russell Le Sueur Fergus
El Paso Boone Delaware Jackson Scott Lincoln Flathead
Elbert Brown Elkhart Jewell Taylor Lyon Gallatin
Fremont Bureau Fayette Johnson Warren Mahnomen Garfield
Garfield Calhoun Fountain Kearny Woodford Marshall Glacier
Gilpin Carroll Fulton Kingman MAINE Martin Granite
Grand Cass Grant Kiowa Androscoggin McLeod Hill
Gunnison Champaign Hamilton Lane Aroostook Meeker Jefferson
Huerfano Coles Hancock Leavenworth Cumberland Mower Judith Basin
Jackson De Kalb Harrison Lincoln Franklin Murray Lake
Jefferson De Witt Hendricks Logan Hancock Nicollet Lewis and Clark
Kiowa Douglas Henry Marion Kennebec Nobles Madison
Kit Carson Edgar Howard Marshall Lincoln Norman McCone
Lake Ford Huntington McPherson Oxford Olmsted Meagher
Larimer Fulton Jay Meade Penobscot Otter Tail Missoula
Las Animas Greene Jennings Mitchell Piscataquis Pennington Park
Lincoln Grundy Johnson Nemaha Somerset Pipestone Phillips
Logan Hancock Kosciusko Ness York Polk Pondera
Mesa Henderson LaGrange Norton MARYLAND Pope Powder River
Moffat Henry Lawrence Osborne Baltimore Ramsey Powell
Montezuma Iroquois Madison Ottawa Calvert Red Lake Prairie
Montrose Jersey Marion Pawnee Carroll Redwood Ravalli
Morgan Jo Daviess Marshall Phillips Frederick Renville Richland
Otero Kane Miami Pottawatomie Harford Rice Roosevelt
Ouray Kendall Monroe Pratt Howard Rock Rosebud
Park Knox Montgomery Rawlins Montgomery Roseau Sanders
Phillips La Salle Noble Republic Washington Scott Sheridan
Pitkin Lee Orange Rice MASS. Sherburne Silver Bow
Prowers Livingston Putnam Riley Essex Sibley Stillwater
Pueblo Logan Randolph Rooks Middlesex Stearns Teton
Rio Blanco Macon Rush Rush Worcester Steele Toole
San Miguel Marshall Scott Saline MICHIGAN Stevens Valley
Summit Mason Shelby Scott Branch Swift Wibaux
Teller McDonough St. Joseph Sheridan Calhoun Todd Yellowstone
Washington McLean Steuben Sherman Cass Traverse
Weld Menard Tippecanoe Smith Wabasha
Yuma Mercer Tipton Stanton Wadena
Union Thomas Waseca
Vermillion Washington


(continued)

TABLE AF101(1)‒continued HIGH RADON-POTENTIAL (ZONE 1) COUNTIESa

NEBRASKA Morris Columbiana Lehigh Union Fairfax Crawford
Adams Somerset Coshocton Luzerne Walworth Falls Church Dane
Boone Sussex Crawford Lycoming Yankton Fluvanna Dodge
Boyd Warren Darke Mifflin TENNESEE Frederick Door
Burt NEW MEXICO Delaware Monroe Anderson Fredericksburg Fond du Lac
Butler Bernalillo Fairfield Montgomery Bedford Giles Grant
Cass Colfax Fayette Montour Blount Goochland Green
Cedar Mora Franklin Northampton Bradley Harrisonburg Green Lake
Clay Rio Arriba Greene Northumberland Claiborne Henry Iowa
Colfax San Miguel Guernsey Perry Davidson Highland Jefferson
Cuming Santa Fe Hamilton Schuylkill Giles Lee Lafayette
Dakota Taos Hancock Snyder Grainger Lexington Langlade
Dixon NEW YORK Hardin Sullivan Greene Louisa Marathon
Dodge Albany Harrison Susquehanna Hamblen Martinsville Menominee
Douglas Allegany Holmes Tioga Hancock Montgomery Pepin
Fillmore Broome Huron Union Hawkins Nottoway Pierce
Franklin Cattaraugus Jefferson Venango Hickman Orange Portage
Frontier Cayuga Knox Westmoreland Humphreys Page Richland
Furnas Chautauqua Licking Wyoming Jackson Patrick Rock
Gage Chemung Logan York Jefferson Pittsylvania Shawano
Gosper Chenango Madison RHODE ISLAND Knox Powhatan St. Croix
Greeley Columbia Marion Kent Lawrence Pulaski Vernon
Hamilton Cortland Mercer Washington Lewis Radford Walworth
Harlan Delaware Miami S. CAROLINA Lincoln Roanoke Washington
Hayes Dutchess Montgomery Greenville Loudon Rockbridge Waukesha
Hitchcock Erie Morrow S. DAKOTA Marshall Rockingham Waupaca
Hurston Genesee Muskingum Aurora Maury Russell Wood
Jefferson Greene Perry Beadle McMinn Salem WYOMING
Johnson Livingston Pickaway Bon Homme Meigs Scott Albany
Kearney Madison Pike Brookings Monroe Shenandoah Big Horn
Knox Onondaga Preble Brown Moore Smyth Campbell
Lancaster Ontario Richland Brule Perry Spotsylvania Carbon
Madison Orange Ross Buffalo Roane Stafford Converse
Nance Otsego Seneca Campbell Rutherford Staunton Crook
Nemaha Putnam Shelby Charles Mix Smith Tazewell Fremont
Nuckolls Rensselaer Stark Clark Sullivan Warren Goshen
Otoe Schoharie Summit Clay Trousdale Washington Hot Springs
Pawnee Schuyler Tuscarawas Codington Union Waynesboro Johnson
Phelps Seneca Union Corson Washington Winchester Laramie
Pierce Steuben Van Wert Davison Wayne Wythe Lincoln
Platte Sullivan Warren Day Williamson WASHINGTON Natrona
Polk Tioga Wayne Deuel Wilson Clark Niobrara
Red Willow Tompkins Wyandot Douglas UTAH Ferry Park
Richardson Ulster PENNSYLVANIA Edmunds Carbon Okanogan Sheridan
Saline Washington Adams Faulk Duchesne Pend Oreille Sublette
Sarpy Wyoming Allegheny Grant Grand Skamania Sweetwater
Saunders Yates Armstrong Hamlin Piute Spokane Teton
Seward N. CAROLINA Beaver Hand Sanpete Stevens Uinta
Stanton Alleghany Bedford Hanson Sevier W. VIRGINIA Washakie
Thayer Buncombe Berks Hughes Uintah Berkeley
Washington Cherokee Blair Hutchinson VIRGINIA Brooke
Wayne Henderson Bradford Hyde Alleghany Grant
Webster Mitchell Bucks Jerauld Amelia Greenbrier
York Rockingham Butler Kingsbury Appomattox Hampshire
NEVADA Transylvania Cameron Lake Augusta Hancock
Carson City Watauga Carbon Lincoln Bath Hardy
Douglas N. DAKOTA Centre Lyman Bland Jefferson
Eureka All Counties Chester Marshall Botetourt Marshall
Lander OHIO Clarion McCook Bristol Mercer
Lincoln Adams Clearfield McPherson Brunswick Mineral
Lyon Allen Clinton Miner Buckingham Monongalia
Mineral Ashland Columbia Minnehaha Buena Vista Monroe
Pershing Auglaize Cumberland Moody Campbell Morgan
White Pine Belmont Dauphin Perkins Chesterfield Ohio
NEW Butler Delaware Potter Clarke Pendleton
HAMPSHIRE Carroll Franklin Roberts Clifton Forge Pocahontas
Carroll Champaign Fulton Sanborn Covington Preston
NEW JERSEY Clark Huntingdon Spink Craig Summers
Hunterdon Clinton Indiana Stanley Cumberland Wetzel
Mercer Juniata Sully Danville WISCONSIN
Monmouth Lackawanna Turner Dinwiddie Buffalo
Lancaster
Lebanon

a. The EPA recommends that this county listing be supplemented with other available State and local data to further understand the radon potential of a Zone 1 area.

AF101.1 General

STATE AMENDMENT
This appendix contains requirements for new construction in jurisdictions where radon-resistant construction is required.

Inclusion of this appendix by jurisdictions shall be determined through the use of locally available data or determination of Zone 1 designation in Figure AF101 and Table AF101(1).
This appendix contains minimum requirements for new construction in the high radon potential counties as listed in Table AF101(1) regardless of the radon levels at the site. These requirements are intended to provide a passive means of resisting radon gas entry and prepare the dwelling for postconstruction radon mitigation, if necessary. See Figure AF102. Active construction techniques, rather than passive techniques, shall be permitted to be used where approved.

Alternatively, the passive system requirements of ANSI/AARST Standard Designation #CCAH: Reducing Radon in New Construction of One & Two Family Dwellings and Townhouses, 2013 may be used for new construction in Zone 1, or approved equal system.

Irrespective of which approach is used, no testing is required as follows:

  1. for the radon levels at the site prior to construction;
  2. for the radon control system when completed; or
  3. in the building after completion of the project.
Therefore, such testing shall not be a condition of issuing a certificate of occupancy.


FIGURE AF102 RADON-RESISTANT CONSTRUCTION DETAILS FOR FOUR FOUNDATION TYPES

AF102.1 General

STATE AMENDMENT
For the purpose of these requirements, the terms used shall be defined as follows:

DRAIN TILE LOOP. A continuous length of drain tile or perforated pipe extending around all or part of the internal or external perimeter of a basement or crawl space footing.

GAS-PERMEABLE LAYER. A gas-permeable layer shall consist of one of the following:
  1. A uniform layer of clean aggregate that is not less than four inches (102 mm) thick. The aggregate shall consist of material that will pass through a two-inch (51-mm) sieve and be retained by a ¼-inch (6.4-mm) sieve.
  2. A uniform layer of sand (native or fill) that is not less than four inches (102 mm) thick and that is overlain by a soil gas collection mat or soil gas matting installed in accordance with the manufacturer’s instructions. The soil gas mat or matting shall be designed for this purpose and condition, and have the capacity to freely transport soil gases to the collection point from the most remote area.
RADON GAS. A naturally occurring, chemically inert, radioactive gas that is not detectable by human senses. As a gas, it can move readily through particles of soil and rock, and can accumulate under the slabs and foundations of homes where it can easily enter into the living space through construction cracks and openings.

SOIL-GAS-RETARDER. A continuous membrane of 6-mil (0.15 mm) polyethylene or other equivalent material used to retard the flow of soil gases into a building.

SUBMEMBRANE DEPRESSURIZATION SYSTEM. A system designed to achieve lower submembrane air pressure relative to crawl space air pressure by use of a vent drawing air from beneath the soil-gas-retarder membrane

SUBSLAB DEPRESSURIZATION SYSTEM (Active). A system designed to achieve lower subslab air pressure relative to indoor air pressure by use of a fan-powered vent drawing air from beneath the slab.

SUBSLAB DEPRESSURIZATION SYSTEM (Passive). A system designed to achieve lower subslab air pressure relative to indoor air pressure by use of a vent pipe routed through the conditioned space of a building and connecting the subslab area with outdoor air, thereby relying on the convective flow of air upward in the vent to draw air from beneath the slab.
The following construction techniques are intended to resist radon entry and prepare the building for post-construction radon mitigation, if necessary (see Figure AF102). These techniques are required in areas where designated by the jurisdiction.
A layer of gas-permeable material shall be placed under all concrete slabs and other floor systems that directly contact the ground and are within the walls of the living spaces of the building, to facilitate future installation of a subslab depressurization system, if needed. The gas-permeable layer shall consist of one of the following:

1. A uniform layer of clean aggregate, a minimum of 4 inches (102 mm) thick. The aggregate shall consist of material that will pass through a 2-inch (51 mm) sieve and be retained by a 1/4-inch (6.4 mm) sieve.

2. A uniform layer of sand (native or fill), a minimum of 4 inches (102 mm) thick, overlain by a layer or strips of geotextile drainage matting designed to allow the lateral flow of soil gases.

3. Other materials, systems or floor designs with demonstrated capability to permit depressurization across the entire subfloor area.
A minimum 6-mil (0.15 mm) [or 3-mil (0.075 mm) cross-laminated] polyethylene or equivalent flexible sheeting material shall be placed on top of the gas-permeable layer prior to casting the slab or placing the floor assembly to serve as a soil-gas-retarder by bridging any cracks that develop in the slab or floor assembly, and to prevent concrete from entering the void spaces in the aggregate base material. The sheeting shall cover the entire floor area with separate sections of sheeting lapped at least 12 inches (305 mm). The sheeting shall fit closely around any pipe, wire or other penetrations of the material. All punctures or tears in the material shall be sealed or covered with additional sheeting.
Potential radon entry routes shall be closed in accordance with Sections AF103.4.1 through AF103.4.10.
Openings around bathtubs, showers, water closets, pipes, wires or other objects that penetrate concrete slabs, or other floor assemblies, shall be filled with a polyurethane caulk or equivalent sealant applied in accordance with the manufacturer's recommendations.
All control joints, isolation joints, construction joints, and any other joints in concrete slabs or between slabs and foundation walls shall be sealed with a caulk or sealant. Gaps and joints shall be cleared of loose material and filled with polyurethane caulk or other elastomeric sealant applied in accordance with the manufacturer's recommendations.
Condensate drains shall be trapped or routed through nonperforated pipe to daylight.
Sump pits open to soil or serving as the termination point for subslab or exterior drain tile loops shall be covered with a gasketed or otherwise sealed lid. Sumps used as the suction point in a subslab depressurization system shall have a lid designed to accommodate the vent pipe. Sumps used as a floor drain shall have a lid equipped with a trapped inlet.
Hollow block masonry foundation walls shall be constructed with either a continuous course of solid masonry, one course of masonry grouted solid, or a solid concrete beam at or above finished ground surface to prevent the passage of air from the interior of the wall into the living space. Where a brick veneer or other masonry ledge is installed, the course immediately below that ledge shall be sealed. Joints, cracks or other openings around all penetrations of both exterior and interior surfaces of masonry block or wood foundation walls below the ground surface shall be filled with polyurethane caulk or equivalent sealant. Penetrations of concrete walls shall be filled.
The exterior surfaces of portions of concrete and masonry block walls below the ground surface shall be dampproofed in accordance with Section R406.
Air-handling units in crawl spaces shall be sealed to prevent air from being drawn into the unit.

Exception: Units with gasketed seams or units that are otherwise sealed by the manufacturer to prevent leakage.
Ductwork passing through or beneath a slab shall be of seamless material unless the air-handling system is designed to maintain continuous positive pressure within such ducting. Joints in such ductwork shall be sealed to prevent air leakage.

Ductwork located in crawl spaces shall have seams and joints sealed by closure systems in accordance with Section M1601.4.1.
Openings around all penetrations through floors above crawl spaces shall be caulked or otherwise filled to prevent air leakage.
Access doors and other openings or penetrations between basements and adjoining crawl spaces shall be closed, gasketed or otherwise filled to prevent air leakage.
In buildings with crawl space foundations, the following components of a passive submembrane depressurization system shall be installed during construction.

Exception: Buildings in which an approved mechanical crawl space ventilation system or other equivalent system is installed.
Crawl spaces shall be provided with vents to the exterior of the building. The minimum net area of ventilation openings shall comply with Section R408.1.
The soil in crawl spaces shall be covered with a continuous layer of minimum 6-mil (0.15 mm) polyethylene soil-gas-retarder. The ground cover shall be lapped not less than 12 inches (305 mm) at joints and shall extend to all foundation walls enclosing the crawl space area.
A plumbing tee or other approved connection shall be inserted horizontally beneath the sheeting and connected to a 3- or 4-inch-diameter (76 or 102 mm) fitting with a vertical vent pipe installed through the sheeting. The vent pipe shall be extended up through the building floors, and terminate not less than 12 inches (305 mm) above the roof in a location not less than 10 feet (3048 mm) away from any window or other opening into the conditioned spaces of the building that is less than 2 feet (610 mm) below the exhaust point, and 10 feet (3048 mm) from any window or other opening in adjoining or adjacent buildings.
In basement or slab-on-grade buildings, the following components of a passive subslab depressurization system shall be installed during construction.
A minimum 3-inch-diameter (76 mm) ABS, PVC or equivalent gas-tight pipe shall be embedded vertically into the subslab aggregate or other permeable material before the slab is cast. A "T" fitting or equivalent method shall be used to ensure that the pipe opening remains within the subslab permeable material. Alternatively, the 3-inch (76 mm) pipe shall be inserted directly into an interior perimeter drain tile loop or through a sealed sump cover where the sump is exposed to the subslab aggregate or connected to it through a drainage system.

The pipe shall be extended up through the building floors, and terminate at least 12 inches (305 mm) above the surface of the roof in a location at least 10 feet (3048 mm) away from any window or other opening into the conditioned spaces of the building that is less than 2 feet (610 mm) below the exhaust point, and 10 feet (3048 mm) from any window or other opening in adjoining or adjacent buildings.
In buildings where interior footings or other barriers separate the subslab aggregate or other gas-permeable material, each area shall be fitted with an individual vent pipe. Vent pipes shall connect to a single vent that terminates above the roof or each individual vent pipe shall terminate separately above the roof.
Components of the radon vent pipe system shall be installed to provide positive drainage to the ground beneath the slab or soil-gas-retarder.
Radon vent pipes shall be accessible for future fan installation through an attic or other area outside the habitable space.

Exception: The radon vent pipe need not be accessible in an attic space where an approved roof-top electrical supply is provided for future use.
Exposed and visible interior radon vent pipes shall be identified with not less than one label on each floor and in accessible attics. The label shall read: "Radon Reduction System."
Combination basement/crawl space or slab-on-grade/crawl space foundations shall have separate radon vent pipes installed in each type of foundation area. Each radon vent pipe shall terminate above the roof or shall be connected to a single vent that terminates above the roof.
Joints in air ducts and plenums in unconditioned spaces shall meet the requirements of Section M1601. Thermal envelope air infiltration requirements shall comply with the energy conservation provisions in Chapter 11. Fireblocking shall meet the requirements contained in Section R302.11.
To provide for future installation of an active submembrane or subslab depressurization system, an electrical circuit terminated in an approved box shall be installed during construction in the attic or other anticipated location of vent pipe fans. An electrical supply shall also be accessible in anticipated locations of system failure alarms.
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