Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter CHAPTER 51 - MASSACHUSETTS RESIDENTIAL CODE
Appendix AF - RADON CONTROL METHODS - ADOPT AS REVISED
Section AF103.3 - Soil-gas-retarder.

Revise and replace section AF103.3 Soil-gas-retarder as follows:

The soil in basements and enclosed crawl spaces shall be covered with a soil-gas-retarder. The soil-gas-retarder shall be lapped not less than 12 inches (305 mm) at joints and shall extend to foundation walls enclosing the basement or crawl space. The soil gas-retarder shall fit closely around any pipe, wire or other penetrations of the material. Punctures or tears in the material shall be sealed T or covered with additional sheeting. The membrane shall extend upward six inches be sealed to the perimeter footing or wall with an ASTM C290 class 25 or higher sealant or equal.