The VaporFlex® product line performs as a highly effective vapor barrier that impedes moisture and water vapor infiltration through concrete slabs and foundations. VaporFlex® is used to discourage mold growth and prevent harmful vapors from migrating through the concrete into building interiors. It exceeds all of the Class A vapor barrier standards as set out by ASTM E1745 requirements. Class A is ASTM's highest performance standard for "Water Vapor Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs." VaporFlex® vapor barriers are available in 15 mils thick variation, exceeding the physical requirements of ASTM E1745. They are available in easy-to-use rolls, making them easy to transport and install. Applications · Wall and ceiling vapor barrier · Foundation damp-proofing · Sill and plate poly · Eaves protection