We have an interior room with poured concrete walls (tornado shelter).  We’re in zone 3 and our basement r requirements are 5/13.  Current plan is to glue 1” XPS on… We have an interior room with poured concrete walls (tornado shelter).  We’re in zone 3 and our basement r requirements are 5/13.  Current plan is to glue 1” XPS on…Read MoreGreenBuildingAdvisor

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