Moisture Vapor Barrier For Concrete

A concrete vapor barrier is any material that prevents moisture from entering a concrete slab.

Moisture vapor barrier for concrete.

Aci 302 2r 06 guide for concrete floors that receive moisture sensitive flooring materials estimates that concrete with a w c of 0 5 will dry to an mver of 3 pounds 1000 sq. Meadows makes a concrete vapor barrier called perminator. Meadows 10 and 15 mil vapor barrier. Very hot and humid climates may benefit from an exterior vapor barrier that keeps outside humidity from penetrating into walls.

A concrete vapor barrier is simply a sheet of polyethylene plastic visqueen placed directly on top of the sub grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete. Water vapor leaves the surface of a concrete slab at a rate that is called the moisture vapor emission rate mver. But they have also proven to be beneficial in reducing failures of moisture sensitive flooring materials adhesives and coatings caused by excessive emission of moisture vapor from concrete slabs. What is a concrete vapor barrier.

Below grade walls and floor slabs transmit ground moisture through concrete walls or slabs. Perminator vapor barriers help reduce the penetration of moisture and water vapor through the slab and into the building which helps reduce mold fungus and mildew. Perminator also helps reduce radon gases from entering a building through. Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way.

A vapor barrier against the concrete surface is generally recommended before wood framing or flooring materials are installed. Ft 24 hours in 82 days with a vapor barrier compared to 144 days when exposed to vapor from below.