“Smart” vapor retarders for areas with low summer humidity
Literature for “smart” vapor retarders all appear to describe use based on low humidity winters vs high humidity summers. However, the climate in the inland (east of the Cascades) Pacific Northwest, is moderate humidity winters and low humidity summers. In this climate, is there any value to “smart” vapor retarders? If there is value, do the differing vapor permeability curves of the available membranes (e.g. Membrain, Intello, or even plywood) make any difference?
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