Plastic Sheet Under Concrete Slab

Polyethylene sheeting under concrete slab under slab vapor retarders play a very important role in retarding moisture from coming up through the concrete and into the structure. This plastic can be used to cover crawl spaces and as a temporary cover for equipment and supplies. Recently though research has shown that the old traditional layer of 6 mil visqueen polyethylene plastic under the slab is seldom effective for two main reasons.

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This plastic sheet is in direct contact with the concrete as it should be in a rational world.

Plastic sheet under concrete slab.

Commonly used under concrete slabs as a vapor barrier and on top of freshly poured slabs as a curing blanket. Plastic sheeting is a general purpose plastic film for use in a variety of construction and diy projects. 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. This heavy duty plastic is commonly used under concrete slabs as a vapor barrier on top of freshly poured slabs as a curing blanket and as a temporary cover for equipment and supplies.

Although it may seem water tight this grade of material allows a lot of water vapor to pass through. Barricade s 6 mil plastic sheeting is a general purpose plastic film for use in a variety of construction gardening and diy applications. Today most experts feel very strongly that engineered films designed specifically for use as vapor retarders should be used as vapor retarders. Plastic sheeting is a general purpose plastic film for use in a variety of construction and diy projects.

Vapor retarders have been used since the 1950s. 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. The hdx 20 ft. Concrete contractors learned that a layer of poly helps to keep a slab dry because it stops upward vapor diffusion from the soil.

Almost everywhere except california that slabs are placed on the ground a plastic sheet a vapor barrier is located directly under the concrete slab and on top of the ground photograph 1. This extra heavy duty plastic can be used under concrete slabs as a vapor barrier and on top of freshly poured slabs as a curing blanket. Finally some contractors in cold climates began installing a continuous horizontal layer of rigid foam insulation under their concrete slabs.

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