Vapor Barrier For Concrete Slab

Aci 302 1 which is an american concrete institute standard for slab construction was modified in the early 2000 s to reflect the change in the placement of the vapor barrier directly below the concrete if a low permeable membrane flooring was to be installed. A vapor barrier is an impermeable membrane primarily used to resist water vapor transmission from the soil to the concrete slab. The term vapor barrier is often used interchangeably with the term vapor retarder to describe all membranes used to resist water vapor transmission.

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Vapor barrier for concrete slab.

The other characteristic of a good vapor barrier that makes it effective is resistance to punctures and tears. Find out where to buy vapor barriers and other problem solving products. Should you put a vapor barrier under concrete slabs. Vapor and gas barriers.

Uncontrolled water vapor through concrete slabs has cost building owners designers and contractors billions of dollars. To be effective a vapor barrier must be installed in a way that prevents any water vapor from getting to the slab. Aci 302 1 guide for concrete floor and slab construction states that the minimum thickness of an effective vapor barrier is 10 mils. But they have also proven to be beneficial in reducing failures of moisture sensitive flooring materials adhesives and coatings caused by excessive emission of moisture vapor from concrete slabs.

The use of underslab vapor barriers is the best method and most economical solution for controlling water vapor migration through concrete slabs. Astm e 1643 standard practice for installation of vapor retarders used in contact with earth or granular fill under concrete slabs provides details but here are a few tips. A vapor barrier should be used for all concrete floors and slabs that are going to receive an impermeable floor finish like epoxy laminate linoleum and wood or if the concrete floor will be used for any purpose where the passage of water vapor through the floor may create problems. Vapor barriers come in two types 6 mil vapor barrier roll.

Our moistureblock is a 6 mil polyethylene film vapor barrier that is used during the installation process with floating laminate luxury vinyl planks and engineered wood floors. Vapor barriers have been associated with certain concrete slab on grade problems including curling and cracking.

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