Plastic Vapor Barrier For Concrete

It will hold up better to job site traffic is more puncture resistant and a better all around product for the money.

Plastic vapor barrier for concrete.

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. Before rolling out the underlayment be sure to sweep vacuum and remove all debris on the substructure. Below grade walls and floor slabs transmit ground moisture through concrete walls or slabs. In temperate climates we see no advantage to placing a vapor retarder beneath a sidewalk.

A vapor barrier is not the same as an underlayment. It comes in a roll 14 feet by 140 feet. 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. If you have a concrete floor that s in continuous contact with a source of moisture you re going to have problems.

Thin plastic like this is often called a vapor retarder meaning it slows the vapor down but doesn t stop it. Vapor barriers are a way to keep moisture from getting into the concrete. Always read the flooring manufacturers recommendations and instructions before installing the underlayment. If you re in a cold climate and the subgrade soil is poorly drained a vapor barrier might be marginally useful.

The american concrete institute s guide for concrete floor and slab construction recommends that the thickness of the vapor retarder be at least 10 mils. For sidewalks placed directly on the subgrade soil is a sheet plastic vapor retarder useful or harmful. Barricade s 6 mil plastic sheeting is a general purpose plastic film for use in a variety of construction gardening and diy applications. This is why a vapor barrier under concrete is essential.

The concrete vapor barrier we use the most is stego wrap s 15 mil thick vapor barrier. Puncture studies of 6 8 10 and 20 mil vapor retarder materials have shown that 10 mils is the minimum thickness that should be considered and thicker material may be necessary over. A vapor barrier against the concrete surface is generally recommended before wood framing or flooring materials are installed. 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.