noun Date: circa 1941 a layer of material (as roofing paper or polyethylene film) used to retard or prevent the absorption of moisture into a construction (as a wall or floor)
VAPOR BARRIER
Meaning of VAPOR BARRIER in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012