Last Updated
：2025/11/24
vapor retarder
（ plural ）
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A layer of material or a laminate used to appreciably reduce the flow of water vapor into a roof assembly.
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vapor retarder
Before installing the insulation, the crew applied a vapor retarder across the roof deck to prevent moisture from entering the assembly.
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Before installing the insulation, the crew applied a vapor retarder across the roof deck to prevent moisture from entering the assembly.
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