Statutes, codes, and regulations
District Of Columbia Administrative Code
Title 12 - CONSTRUCTION CODES SUPPLEMENT OF 2017Subtitle 12-B - RESIDENTIAL CODE SUPPLEMENT OF 2017
Appendix 12-B-F - ASSIVE RADON GAS CONTROLS
Rule 12-B-F103 - PASSIVE RADON-RESISTANT SYSTEM REQUIREMENTS

D.C. Mun. Regs. tit. 12, app 12-B-F r. 12-B-F103

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Current through Register Vol. 71, No. 43, October 25, 2024
Rule 12-B-F103 - PASSIVE RADON-RESISTANT SYSTEM REQUIREMENTS

Appendix F, Passive Radon Gas Controls, of the International Residential Code is adopted in the District of Columbia as Appendix F of the Residential Code with the following amendments.

Strike Section AF103.3.2 in Appendix F of the International Residential Code in its entirety and insert new Section AF103.3.2 in Appendix F of the Residential Code in its place to read as follows:

AF103.3.2"T" fitting and vent pipe. A 3 or 4-inch "T" fitting shall be inserted beneath the soil- gas-retarder and be connected to a vent pipe. The vent pipe shall extend through the conditioned space of the dwelling 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. Install at least one vertical pipe every 4,000 square feet (186 to 371 square meters) of footprint area.

Strike Section AF 103.4.3 in Appendix F of the International Residential Code in its entirety and insert new Section AF103.4.3 in Appendix F of the Residential Code in its place to read as follows:

AF103.4.3 "T" fitting and vent pipe. Before a slab is cast or other floor system is installed, a 3- or 4-inch "T" fitting shall be inserted below the slab or other floor system and the soil- gas-retarder. The "T" fitting shall be connected to a 3- or 4-inch vent pipe. The vent pipe shall extend through the conditioned space of the dwelling 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. Install at least one vertical pipe every 4,000 square feet (186 to 371 square meters) of slab area.

Strike Section AF103.10 in Appendix F of the International Residential Code in its entirety and insert new Section AF103.10 in Appendix F of the Residential Code in its place to read as follows:

AF103.10Power source and access for future radon fan. To provide for future installation of an in- line radon fan, an electrical circuit terminated in an approved box shall be installed on the top floor of the building or the attic, whichever is taller, during construction in the anticipated location of the radon fan. The location shall be an accessible clear space 24 inches (610 mm) in diameter by 3 feet (914 mm) in height adjacent to the vent pipe.

D.C. Mun. Regs. tit. 12, app 12-B-F r. 12-B-F103

Final Rulemaking published at 67 DCR 5679 (5/29/2020)