True vapor barriers should have a permeance rating ... Vapor Retarders Used in Contact with Earth or Granular Fill Under Concrete Slabs, ASTM International, www.astm.org. ASTM E 1745-09 Standard ...
Concrete is a permeable substance capable of absorbing and releasing moisture, which can continue to affect the RH of a slab long after it's been placed. Many people don’t realize how important ...
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