vapor barrierEnglishOxford New American Dictionaryvapor barrier /ˈvāpər ˈberēər, ˈveɪpər ˈbɛriər/ ▸ noun a thin layer of impermeable material, typically polyethylene sheeting, included in building construction to prevent moisture from damaging the fabric of the building.
EnglishOxford New American Dictionary
