Reducing Radon in New Construction of ANSI/AARST CCAH 2020 1 & 2 Family Dwellings and Townhouses 9 403.2.2.1 Gravel layer soil gas collector. A suction point for a gravel type soil gas collector shall consist of a pipe fitting or other device having not less than two openings oriented so as to create multiple horizontal intake openings within the gravel layer. The horizontal openings shall be provided with not less than 5 feet [1.5 m] of perforated pipe extending fromeach opening of the fitting or device into the gravel layer. Said perforated pipe shall provide aminimum of 1 sq. inch [645 sq. mm] of open perforation area per lineal foot of pipe. 403.2.2.2 Geotextile layer soil gas collector. A suction point for a geotextile type soil gas collector shall consist of a pipe fitting or other device having not less than three openings with two oriented so as to create multiple horizontal intake openings connected to the geotextile mat in a manner to maintain airflow capacity from the plenum. 403.2.2.3 Pipe loop soil gas collector. A suction point for a pipe loop type collector shall consist of a pipe tee fitting or pipe saddle device installed in the loop piping. 403.2.3 Multiple soil gas collection plenums. Where interior footings divide a soil gas collector into two or more areas, each such area shall be provided with the required suction points and joined with radon control system piping in accordance with Section 501. Alternatively, each area shall be interconnected by a soil gas collector that is constructed in accordance with Section 403.1.1.2 or 403.1.1.3 and served by one or more suction points . 403.2.4 Suction points in sump lids not permitted. Suction points are not permitted through sump lids. 403.2.5 Fasten suction points. Suction point fittings and piping shall be fastened in place to prevent dislocation during placement of the gas permeable layer, soil gas retarder and concrete. 403.2.6 Seal top of the soil gas plenum. The soil gas collector and all exposed soil shall be covered with a soil gas retarder installed in accordance with Section 403.2.6.1. 403.2.6.1 Sheeting. Polyethylene sheeting of not less than 6 mils [0.152 mm] in thickness or cross-laminated polyethylene sheeting of not less than 3 mils [0.076 mm] in thickness shall be installed on top of the soil gas collector and shall completely cover the area under the concrete floor and be sealed in accordance with Sections 403.2.6.1.1 through 404.1.6. 403.2.6.1.1 Seams. Seams between adjacent polyethylene sheets shall be overlapped not less than 6 inches [15 cm] and sealed with a caulk complying with ASTMC920 class 25 or higher, or a tape installed in accordance with the manufacturer’s recommendation. 403.2.6.1.2 Repairs. Tears or punctures in the polyethylene sheeting shall be sealed or an additional sheet of polyethylene shall cover the tear or puncture with an overlap of not less than 6 inches [15 cm] on all sides. Such additional sheet shall be sealed and fixed in place with a caulk complying with ASTM C920 class 25 or higher or a tape installed in accordance with the manufacturer’s recommendation to prevent displacement during slab casting.