Definitions for "Vapor retarder"
Keywords:  perm, retard, diffusion, foil, condense
A layer of material intended to obstruct the passage of water vapor through a building assembly; also called a Vapor Barrier; sealing material placed between building components or materials to arrest movement of moisture within building enclosure assembly.
A specially treated paper or thin plastic or foil sheet that resists moisture penetration. Its primary purpose is to reduce condensation of water vapor within building.
A membrane which is placed between the insulation and the roof deck to retard water vapor in the building from entering the insulation and condensing into liquid water.
a Fields two or more sheet waterproof membrane adhered and coated with Fields asphalt