Under-Floor Crawl Space Vapor Retarder
A continuous Class I vapor retarder must cover all exposed earth. Joints must overlap by a minimum of 6 inches (152 mm). All joints must be sealed or taped to create a continuous moisture retarder. The edges of the vapor retarder must extend at least 6 inches (152 mm) up the stem wall. The vapor retarder must be properly attached and sealed to the stem wall or insulation.
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