A moisture-resistant sheet installed in a roof or wall assembly to prevent water vapor from moving through and condensing inside.
A material with low vapor permeability installed to retard the diffusion of moisture vapor through building assemblies including roofs, walls, and floors. In roofing, vapor retarders are placed below the insulation in cold climates to prevent warm interior moisture from condensing within the roof assembly. The required vapor permeance rating depends on climate zone and building use.
A self-adhered vapor retarder was installed on the warm side of the insulation in the cold storage facility roof to prevent condensation.
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