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 ...
Moisture vapor migrating through the slabs can also cause “efflorescence” or powdery crystalline deposit of salts on unsealed concrete ... and air and vapor barriers. Primary chemistries ...
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