Vapour Barrier Under Slab Insulation

I would like to put down an impermeable class 1 vapor barrier on top of the slab before i put down any flooring.

Vapour barrier under slab insulation.

Cure with waterproof sheets rather than with water or curing compounds. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. For a vapor barrier below a concrete floor slab most choose 6 to 10 mil polyethylene. The slab is in fine condition.

Retarder below the slab in direct contact with the slab or rigid insulation having a thermal resistance of at. The slab has plastic sheeting underneath it already. By steve ragan director research and technical services the answer to this controversial question from both angles is a qualified yes vapor barriers have been associated with certain concrete slab on grade problems including curling and cracking. Because extruded polystyrene insulating board will absorb little moisture the vapor barrier can be placed above or below the slab insulation.

My two main thoughts are potential mold growing under the vapor barrier and potential slab degradation. Viper ii under slab vapor barriers viper vaporcheck ii viper ii is the first line of defense against damaging water vapor and soil gas threats existing below the concrete slab. Vapor barrier insulation 7 brand. Certainteed 4 certainteed membrain 1 gcp applied technologies 1 reflectix 1 more ways to filter.

17 2019 12 19 p m. Vapor barriers under concrete floor slabs. Is a vapor barrier necessary under a concrete slab with foam insulation and if so where does go. If you want to make sure your slab on ground gets dry and stays dry use a vapor barrier.

Avoidance of the installation of vapor barriers such as polyethylene vapor barriers foil faced batt insulation and reflective radiant barrier foil. Choosing a vapor barrier. Concrete slab insulation model dbwef48100 137 27 roll 137 27 roll free delivery. What risks are there to do so.

Viper ii products are multi layer co extruded virgin polyolefin under slab vapor barriers retarders. All vapor barriers should conform to astm e 1745. But consider going with a barrier that has water vapor permeance less than 0 3 perms. 4 2020 2 40 p m.