Plastic Sheets Under Concrete

They do this for two main reasons.

Plastic sheets under concrete.

Vapour barriers are the black plastic that builders put under residential house slabs. Wet the concrete then place the plastic sheeting over it. 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. Today most experts feel very strongly that engineered films designed specifically for use as vapor retarders should be used as vapor retarders.

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. Check out our range of builders plastic products at your local bunnings warehouse. Although it may seem water tight this grade of material allows a lot of water vapor to pass through. We encourage retail customers to use our click deliver or drive collect service.

Finally some contractors in cold climates began installing a continuous horizontal layer of rigid foam insulation under their concrete slabs. Another method to prevent discoloration is to place dry straw directly onto the concrete then put the plastic on top of it. To prevent moisture from the soil permeating up through a slab and into a house also known as rising damp. Eventually polyethylene was invented.

Visit us today for the widest range of building construction products. In this video part of. Covid 19 update to customers our metropolitan melbourne stores will remain open for trade customers only. Concrete contractors learned that a layer of poly helps to keep a slab dry because it stops upward vapor diffusion from the soil.