Should I Put Plastic Under My Concrete Slab

Should you put a vapor barrier under concrete slabs.

Should i put plastic under my concrete slab. This plastic sheet is in direct contact with the concrete as it should be in a rational world. There s not even a hair line crack in the slab i m with rs i went with the plastic in my garage too. Aci 302 1 guide for concrete floor and slab construction states that the minimum thickness of an effective vapor barrier is 10 mils. Thinner plastic can t stand up to the abuse of construction.

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. 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. Put plastic down and mesh and 4 inches of concrete. Thanks for the question.

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. Quality concrete slab design are vapor ers necessary for bats and garages 3 reasons to use crushed stone under concrete slabs b r sand concrete slab floor and how to make one by hand mixing the aggregates the difference between crushed stone and gravel subgrades subbases for concrete slabs the network. 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. There are debates about this with varying national regional state and local regulations.

It will help keep moisture from wicking up through the slab. This was verfied by some field studies conducted by concrete construction magazine. Why a plastic vapor barrier under concrete slab mondays with.