Vapor Barrier Over Concrete Slab Carpet

If your concrete passes the moisture test then plastic sheeting at least 6 mils thick will prevent moisture from getting into your laminate flooring.

Vapor barrier over concrete slab carpet.

They look similar to carpet padding but they have a plastic film on the surface to block moisture. Fill in any. Any of our vapor barrier types of products can be used in this application over the concrete slab. Lay the sheet over the concrete floor dimples down overlap adjacent edges and tape the seams.

Dimpled polyethylene underlayment is available from home centers flooring suppliers or online. Install it over a layer of fill. Vapor barriers have been associated with certain concrete slab on grade problems including curling and cracking. Start with a vapor retarder with a perm rating that reflects the needs of the space.

It needs to dry and then stay dryto avoid flooring problems. Concrete absorbs and retains water and the moisture can seep into the carpet padding and then into the carpet. Inspect it before pouring the concrete and fix any tears it may have. 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.

Install a plastic vapor barrier. Moisture barriers as the name implies set up a protective barrier to block moisture from reaching the pad and the carpet. The layers above and below the concrete slab to prevent water seepage into the slab. Before rolling out the underlayment be sure to sweep vacuum and remove all debris on the substructure.

Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way. How to install vapor barrier on concrete floor under laminate flooring always read the flooring manufacturers recommendations and instructions before installing the underlayment. Where plastic sheets must be joined overlap the sheets by several inches and use strong vinyl tape to secure them. A concrete vapor barrier is any material that prevents moisture from entering a concrete slab.

I would recommend raven industries vaporblock 20 plus or the vaporblock plus 6 as two of the better ones since they also block out radon methane and voc s. Add the plywood layer on top and anchor it to the concrete with 15 concrete screws predrilled and countersunk per 4 x 8 ft.