Do You Need A Moisture Barrier Under Concrete. The excess or free water within the concrete is the source of some of the moisture in a slab. To test to see if moisture is coming up through concrete, you can tape a sheet of plastic over the concrete and leave it there for 24 hours. For installation of vinyl flooring you need a smooth, even surface for the underside of the flooring to achieve the best contact for adhesion.
Do I Need Vapor Barrier In Ceiling | Nakedsnakepress.com
Concrete must have a capillary break or the concrete will remain damp for years. If you're in a cold climate and the subgrade soil is poorly drained, a vapor barrier might be marginally useful. A concrete vapor barrier is any material that prevents moisture from entering a concrete slab.
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By graham davis september 23, 2019. A concrete floor may need a moisture barrier before vinyl flooring can be installed. Months or years from now the water table link might rise and the water will pass through concrete in water vapors with a capillary effect. For installation of vinyl flooring you need a smooth, even surface for the underside of the flooring to achieve the best contact for adhesion.
