Vapor Barrier On Slab Before Hardwood

Underlayment with 6 mil vapor barrier.

Vapor barrier on slab before hardwood.

The other two says it depends on our area of the valley and our slab. Concrete tends to wick water quickly and the barrier holds back most of the moisture. Vapor barriers are used because while fresh concrete is poured wet it s not supposed to stay that way. A concrete vapor barrier is any material that prevents moisture from entering a concrete slab.

First vapor barrier on the concrete slab one of companies always uses a vapor barrier flooring vinyl on all their jobs. No need to bother with large fold out low quality off spec construction grade films which can be bothersome and hard to use before the floor is installed. Try cutting a 12 inch by 12 inch. Cut another piece of vapor barrier material large enough to cover the damaged area by a minimum of 6 inches on all sides.

If the vapor barrier gets damaged before the concrete pour it must be repaired. 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. There are many types of vapor barriers including pvc. We are talking about a glue down install of engineered wood over an on grade slab.

Tape all the seams to adhere the repair piece to the existing vapor barrier. It needs to dry and then stay dry to avoid flooring problems. Preventing the moisture from seeping up into the hardwood requires the installation of a vapor barrier also called a moisture barrier.