Plastic Liner Under Concrete Slab

Water vapor diffusing through the concrete slab can also lead to deformation and discoloration of the floor covering material leading to costly repairs or even replacement.

Plastic liner under concrete slab.

One laboratory drying study indicated that 4 in. The american concrete institute states that a vapor retarder should be placed directly under a concrete slab on grade if now or in the future a low permeable membrane floor finish will be installed upon the slab. The rate that moisture escapes from a slab depends on the concrete w c the density of the finish the ambient conditions above the slab and the moisture below the slab. As long as the polyethylene is protected from sunlight as it obviously is when it is installed under a concrete slab it should last indefinitely.

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. Covid 19 update to customers our metropolitan melbourne stores will remain open for trade customers only. However the first piece which is anchored into the concrete with 2 1 2 inch masonry screws must be pressure treated wood as it is resting directly against the concrete slab. We encourage retail customers to use our click deliver or drive collect service.

Thanks for the question. Visit us today for the widest range of building construction products. Thick concrete samples having a w c 0 50 and sealed from below required 82 days for the vapor emission rate to reach 3 0. Monitoring and 3 year lived in experiencing compact sub base compact ab or similar 40 mil plastic liner vapor and radon.

Build your curb at the entry of the shower stall. Make your curb out of 2x4 s. Polyethylene under concrete slabs. Thin plastic like this is often called a vapor retarder meaning it slows the vapor down but doesn t stop it.

There are debates about this with varying national regional state and local regulations.