Learn About Problems with Vapor Barriers in Crawle, That Keep Foundation Piers of Crawle Wet Permanently.These durable, waterproof, reinforced Crawl.e Vapor Barriers are a great value! Their multilayer polyethylene construction with extrusion lamination and reinforced layer of polyester scrim gives them superior strength and durability over typical hardware store vapor barrier options..The best mil crawle vapor barrier for your crawle repair project. Don’t believe the hype about reinforced vapor barrier. It can cause odors .Super tough Mil white crawle vapor barrier. Use this liner to protect your home from moisture in the crawle. Our barriers do not have pin holes, fillers or unnecessary chemicals and naturally resists Mold and Mildew..