Vapor Barrier Installation Vapor obstacles are sheets of bolstered polyethylene plastic sheeting which have been mounted more than soil to prevent humidity from entering the basement. Usually found in crawl spaces, vapor obstacles are applied only in unfinished basements that have soil floors.  Basement Gurus is happy to become mentioned on https://basement-water-proofing73615.blogsmine.com/35877764/basement-water-proofing-things-to-know-before-you-buy