How do you install moisture barrier under concrete slab?

How do you install moisture barrier under concrete slab?

These vapor barriers can be installed over tamped earth, sand or aggregate base: simply unroll and completely cover the area receiving the slab, overlap the seams by 6 inches and seal by heat welding or with sealing tape. All exposed penetrations should also be sealed.

How do you install a vapor barrier on concrete?

How to Install a Vapor Barrier on a Concrete Floor

1. Select the Vapor Barrier.
2. Clean Floor and Perimeter Walls.
3. Apply Butyl Tape to Walls.
4. Unroll and Trim Vapor Barrier Sheets.
5. Apply Vapor Barrier Seam Tape.
6. Fasten Vapor Barrier to Wall.

Should you put a vapor barrier under concrete slabs?

If you have a concrete floor that’s in continuous contact with a source of moisture, you’re going to have problems. This is why a vapor barrier under concrete is essential. Vapor barriers are a way to keep moisture from getting into the concrete.

Is a vapor barrier necessary under a concrete slab?

Where does vapor barrier go under concrete?

However, if an impermeable paint or sealer is planned for the surface, a moisture barrier should go under the concrete. When preparing for a concrete pour, the vapor retarding barrier should be placed directly below where the concrete will be poured.

Where do you put vapor barrier under concrete slab?

1. Most exterior slabs do not need a vapor barrier.
2. In general, place the concrete slab directly on top of the vapor barrier, with the subbase below.
3. The vapor barrier can be placed under the subbase, if the building is closed in when the dry subbase material is placed.

Where should vapor barrier be installed?

Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions: the inner surface in colder climates and the outer surface in hot, humid climates. In existing spaces, oil-based paints or vapor-barrier latex paints offer an effective moisture barrier.