CC-1000_2018

Soil Gas Control Systems ANSI/AARST CC-1000 2018 in New Construction of Buildings 12 shall be inserted into the joint to support the caulk as it cures. 6.2.5 Block-outs and pits Prior to completion of room finishings, openings in the concrete slab that are constructed to facilitate plumbing or other utility needs shall be closed with non-shrink grout, sealed covers or other appropriate method. 6.2.6 Sump pits Sumps or other pit openings in interior floors that connect to soil air and require access for maintenance shall have a rigid lid that is sealed with gasket material or silicone caulk and mechanically fastened in a manner to facilitate removal. The lid shall be made of sturdy and durable plastic such as polycarbonate plastic or other rot-resistant, rigid material sufficient to support anticipated loads in the area of use. Pipe and wiring penetrations through the lid shall be sealed. Gaps between the intersection of the sump basin and the floor or membrane shall be sealed with a caulk complying with ASTM C920 class 25 or h igher, or an equivalent method. 6.2.6.1 Pits that receive water from above concrete or soil gas retarders shall be provided a means to retain water control capabilities of the sump such as an independent floor drain with a one-way flow valve or other mechanical means. 6.2.7 Floor drains Floor drains and condensate drains shall not allow soil gas entry. Access openings in the floor provided for drain maintenance shall not allow soil gas entry. 6.2.8 Air ducts for HVAC systems Air ducts located below concrete slabs or soil gas retarders shall be sealed to prevent radon entry and constructed in accordance with the International Mechanical Code (IMC) 9 . 6.2.9 Label sealed components A label or marking shall be provided for sump lids, block-outs, access openings and other closed surfaces that could require access in the future to indicate these are components of a mitigation system. The label title shall state “Component of a Radon Reduction System” or similar wording and include additional text such as “Return to a closed condition if opened, accessed or damaged.” The labels or markings shall be placed on the component and/or located in a conspicuous place or places (such as at access panels). 9 The International Mechanical Code (IMC) as published by the International Code Council. 6.3 Crawl space earthen floors 6.3.1 General A soil gas retarder shall be installed to cover the top of all exposed earth not covered by concrete in a manner that conforms to all contours of the grading with materials and installation no less than additionally specified in Section 6.4 . 6.3.2 Seal the perimeter of the soil gas retarder The soil gas retarder membrane shall turn up onto foundation walls not less than 6 inches (15 cm) and shall be continuously sealed to the wall along the full perimeter. a) For flat wall surfaces, the membrane shall be sealed to the foundation walls and supports with a caulk complying wit h ASTM C920 class 25 o r higher or equivalent method. b) For irregular surfaces, alternative materials and methods are permitted as long as durable closure of the soil gas collection plenum is achieved. 6.3.3 Penetrations ( soil gas retarders ) The opening for penetrations of a soil gas retarder described in Section 6.2.4 shall be as small as practical and sealed in a permanent, airtight manner. Appropriate seal materials shall be applied for exhaust vent piping and other utility pipes such as gasket fittings, pipe clamps or an appropriate sealant. Other openings in the soil gas retarder such as for sumps, drains and air ducts located within a crawl space shall be sealed in accordance with Sections 6.2.3 through 6.2.8. 6.3.4 Surface water relief (crawl space soil gas retarders ) Designs shall include a plan to address surface water that can accumulate on the top of the membrane due to ground water entry from above the membrane or plumbing leaks. The plan shall include access to the crawl space for remedial action or systems such as sumps or trapped drains that are adequate for control of collected surface water. 6.3.5 Label crawl spaces or soil gas retarders A label or marking shall be located in a conspicuous place or places (such as on the soil gas retarder and at access panels) to identify that the membrane is a component of a mitigation system. The label title shall state “Radon Reduction System” or similar wording and include additional text such as “Return the soil gas retarder membrane to a closed condition if accessed or damaged.” 6 . 4 Materials and installation of soil gas retarders. 6.4.1 Under concrete slabs Polyethylene sheeting of not less than 6 mils (0.152 mm) in thickness or equivalent (e.g., cross-laminated polyethylene sheeting of not less than 3 mils [0.076 mm] in thickness) shall be installed in accordance with