A water vapor barrier is a moisture-resistant material, typically made of heavy duty plastic sheeting. It's usually 6-20 mil thick depending on foot traffic (more foot traffic = thicker), cross ...

A dehumidifier alone is not enough. A vapor barrier consists of plastic sheeting installed on the floors and foundation walls in a crawl space. Typically 10 to 20 millimeters thick, vapor barriers ...

Vapor retarders are sheet materials used below slab-on-ground ... used below ordinary on-ground floor slabs than vapor barriers. Plastic rebar chairs can help prevent punctures in a vapor retarder ...

Moisture is something to be managed. A vapor barrier can cut down on earthy smells, mildew, and general humidity.