Plastic Under Concrete Slab

Vapor barriers under concrete floor slabs.

Plastic under concrete slab.

By steve ragan director research and technical services the answer to this controversial question from both angles is a qualified yes vapor barriers have been associated with certain concrete slab on grade problems including curling and cracking. If a vapor barrier or retarder is required. Visit us today for the widest range of building construction products. Florprufe vapor barriers gcp lied concrete vapor barriers the pros vapor barrier under concrete slab vapour barrier concrete floor problems building concrete vapor barrier what is a.

This plastic sheet is in direct contact with the concrete as it should be in a rational world. 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. A much better approach is a true vapor barrier with characteristics that conform to the requirements of astm e 1745 standard specification for water vapor retarders used in contact with soil or granular fill under concrete slabs. 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.

The black plastic sheet that the reinforcement is sitting on is the vapor barrier. Aci standard 302 1 r 96 guide for concrete floor and slab construction included this recommendation in section 4 1 5. Waffle slabs require vapour barriers too and here are some photos that show a few waffle slabs with vapour barriers again before the concrete is poured. Check out our range of builders plastic products at your local bunnings warehouse.

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