Occasionally referred to as "smart vapor retarders", or "smart vapor control membranes", smart vapor barrier membranes allow vapor diffusion in one direction, but prevent vapor from moving in the other direction. This can be extremely useful to prevent condensation from occurring on the backside of the sheathing if you don't have the budget for rigid exterior insulation or closed cell spray foam.
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What Is a Smart Vapor Barrier? (and Why You Might Need One)
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