Vapor Barrier Under Insulated Concrete Slab

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Vapor barrier under insulated concrete slab.

Because extruded polystyrene insulating board will absorb little moisture the vapor barrier can be placed above or below the slab insulation. But they have also proven to. Vapor barriers under concrete floor slabs. Thin plastic like this is often called a vapor retarder meaning it slows the vapor down but doesn t stop it.

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. The barrier s unique core material is an expanded polystyrene eps with a jobsite tough heavy duty poly film. Ecofoil under slab insulation is superior to traditional outdated forms of concrete floor insulation such as polystyrene or foam sheets. Lay a continuous layer of 1 4 inch foam gasket or similar moisture and air barrier on top of the concrete slab before applying sill plates.

For a vapor barrier below a concrete floor slab most choose 6 to 10 mil polyethylene. All viper ii products are tested and engineered to meet and exceed the class a b and c requirements outlined in astm e 1745 standard specification for plastic water vapor retarders used in contact with soil or granular fill under concrete slabs. Rigid insulation concrete products like foam sheeting are easily broken and must be used with an extra vapor barrier plus standard foam or polystyrene concrete insulation does not stop radiant heat loss or gain. The gasket must be designed specifically for use with.

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. The home 19yrs old has a concrete slab on grade with a visqueen vapor barrier under the slab. Astm e 1745 is the most recognized industry standard for under slab vapor barrier retarders.