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 ...

A prominent use of such barriers is to place them beneath a building to prevent gas and vapor intrusion. They are installed under new slabs during construction. When set correctly, they force soil gas ...

It is made of a combination of prime virgin resins and additives and can be used in contact with and directly below a concrete slab. Stego's vapor barrier has an almost zero Water Vapor ...