Concrete Slab Vapour Barrier

If ground conditions require their use a 3 inch 75 millimeter layer of sand over the vapor barrier and under the concrete has been shown to reduce these problems.

Concrete slab vapour barrier.

This was verfied by some field studies conducted by concrete constructionmagazine. Aci 302 1 guide for concrete floor and slab construction states that the minimum thickness of an effective vapor barrier is 10 mils. Stego industries is the leader in the below slab concrete vapor barrier market. A vapor barrier is an impermeable membrane primarily used to resist water vapor transmission from the soil to the concrete slab.

First a vapor barrier provides a consistent smooth surface for concrete placement teams. Their use should be avoided where ground moisture conditions permit. Thinner plastic can t stand up to the abuse of construction. This can be a time saver where the placement team has a predictable surface on the site throughout.

Uncontrolled water vapor through concrete slabs has cost building owners designers and contractors billions of dollars. The use of underslab vapor barriers is the best method and most economical solution for controlling water vapor migration through concrete slabs. 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. It needs to dry and then stay dryto avoid flooring problems.

Vapor barriers aggravate the problems of plastic and shrinkage cracking. It prevents moisture from coming up through the slab ie rising damp. A vapour barrier is a 0 2mm thick plastic lining under a concrete ground slab. Vapor and gas barriers.

Many moisture problems associated with interior concrete floors and slabs on grade can be minimized or eliminated by installing a vapor barrier under the concrete. Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way. Furthermore placing concrete directly on the vapor barrier s consistent surface can make finishing of the slab more even. Since concrete is porous water vapors transmits from the ground through the concrete slab into your basement.

Known for our flagship stego wrap line of below slab vapor barriers and retarders stego has earned the respect trust and recommendation of architectural engineering and construction communities. Once this happens the flooring can buckle or warp and cause havoc.