An Abington, PA homeowner was interested in installing a vapor barrier in their crawl space, so they contacted Quality 1st Basement Systems for an estimate. A moisture vapor barrier blocks moisture, water and humidity from passing through the foundation wall or floor of the crawl space. It seals the space keeping it healthy! Check out this before and after of the crawl space transformation the CleanSpace Moisture Vapor Barrier does to a nasty crawl space.