Put Plastic Under Concrete Slab

Plastic under concrete floor or not.

Put plastic under concrete slab.

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. One laboratory drying study indicated that 4 in. Thanks for the question. 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.

Vapour barriers are the black plastic that builders put under residential house slabs. One contractor says to put plastic under the concrete it prevents moisture from coming up into the concrete. Why a plastic vapor barrier under concrete slab mondays withinstall the proper type of vapor barrier siouxland homesare vapor ers necessary for bats and garagesvapour barrier under concrete. So yes a vapour barrier is required under a concrete slab for a class 1 building a dwelling and for class 10 eg a garage where the slab is continuous with the dwelling.

There are debates about this with varying national regional state and local regulations. They do this for two main reasons. Don t worry if the concrete contractors put a few holes in the poly. Aci 302 1 guide for concrete floor and slab construction states that the minimum thickness of an effective vapor barrier is 10 mils.

It doesn t really matter very much whether the pex is near the bottom of the slab in the middle of the slab or at the top of the slab as long as there is plenty of insulation under the slab. Thinner plastic can t stand up to the abuse of construction. The other contractor says no way no plastic holds the water in the concrete during the drying process and can leave webbing like visual affect in finish of concrete. This was verfied by some field studies conducted by concrete construction magazine.