I’m concerned about rigid exterior insulation being a vapor barrier
Hello, sorry to add yet another question about exterior rigid insulation, but I can’t find information on this elsewhere. I am working on designing a Habitat for Humanity home in a mixed-humid climate. Dow will give us insulation free, and I want to wrap the home in 1″ over the sheathing and building felt, and under cement-board cladding. I am concerned about it being a vapor barrier, however. I can not find perm information for Dow Stryofoam. Any thoughts?
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