AC461 An Alternate Gas Permeable Layer of a Subslab Depressurization System for Radon Gas Control - Approved Oct 2015 (PDF Download)

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AC461 established guidelines for evaluation of milled or olded rigid cellular polystyrene insulation panels used as the gas permeable layer in a subslab depressuration system for radon gas control under Appendix F of the IRC ad Appendix B of the IgCC.

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