Multiple layers of 6 mil poly sheet in crawlspace
I think I’ve figures out the best method of dealing with my crawlspace. Namely spraying the perimeter walls with closed cell foam, lining the floor with poly sheeting, air sealing the floor joists (due to contaminents), and installing an exhaust fan with supply air grates in living space.
My question is, since I only have access to 6 mil sheet, can I use multiple layers? Or will layers of vapor barrier cause problems?
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