For Vapor retarder we have terms and definitions in 3 topics. The topics are Construction, Energy and Insulation.

Those materials or systems that retard the transmission of vapor under specified conditions.
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A material that retards the movement of water vapor through a building element (walls, ceilings) and prevents insulation and structural wood from becoming damp and metals from corroding. Often applied to insulation batts or separately in the form of treated papers, plastic sheets, and metallic foils.
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Helps control the amount of moisture passing through the insulation and collecting inside exterior walls, ceilings and floors.
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