Reducing Radon in New Construction of ANSI/AARST CCAH 2020 1 & 2 Family Dwellings and Townhouses 7 402.1.2.3 Suction point for gravel soil gas collector. The suction point for a gravel soil gas collector shall consist of a pipe fitting or other device having not less than three openings with two openings oriented so as to create multiple horizontal intake openings. The horizontal openings shall be provided with not less than 5 feet [1.5 m] of perforated pipe extending from each opening of the fitting or device into the gravel layer. Said perforated pipe shall provide a minimum of 1 sq. inch [645 sq. mm] of open perforation area per lineal foot of pipe. 402.1.2.4 Suction points in sump lids not permitted. Suction points are not permitted through sump lids. 402.1.2.5 Fasten suction points. Suction point fittings and devices shall be fixed in place to prevent dislocation. 402.1.3 Seal the soil gas collection plenummembrane. A soil gas retarder shall cover the top of the soil gas collection plenum and all exposed soil. The installation of the soil gas retarder shall be in accordance with Sections 402.1.3.1 through 402.1.3.5. 402.1.3.1 Sheeting. The soil gas retarder membrane shall meet ASTM E1745 Class A, B or C. 402.1.3.2 Seams. The seams between adjacent membrane sheets shall be overlapped not less than 6 inches [15 cm] and shall be sealed by one of the following methods: 1. A tape recommended by the membrane manufacturer. 2. Caulk complying with ASTM C920 class 25 or greater. 402.1.3.3 Repairs. Tears or punctures in the membrane shall be sealed by one or more of the following methods: 1. A tape recommended by the membrane manufacturer. 2. An additional sheet of the membrane material that covers and overlaps the tear or puncture not less than 6 inches [15 cm] on all sides and that is sealed with a caulk complying with ASTM C920 class 25 or greater. 402.1.3.4 Penetrations. Openings in the soil gas retarder membrane for piping, utilities, structural supports or similar penetrations shall be sealed. 402.1.3.5 Seal sides of the soil gas collection plenum. The soil gas retarder membrane shall turn up onto foundation walls and shall be securely fastened and continuously sealed to the wall along the full perimeter with a caulk complying with ASTM C920 class 25 or higher. 402.1.4 Label required (membranes). Soil gas retarder membranes shall be marked in a conspicuous place with a label to identify that the membrane is a component of a radon reduction system. The label lettering shall be of a height of not less than 1/4 inch [6.35 mm] and shall be of a color in contrast to the color of the background on which the lettering is applied.