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Discussion Starter · #1 ·
I have a client that wants to do a "modified" clean space crawl space. The space is dry and in fairly good condition. There is no fiberglass between floor joists (first time I have seen this without clean space, I bet the builder ran out of money).

It all boils down to this. I am going to put a r8-r10 board on the inside crawl space block walls (all vents are sealed). I read that this should then be covered with a vapor barrier. Can I use a foil faced board and would that act as the vapor barrier over the foam board or do I need to be more traditional and hang a 6mil sheet from the sill board and seal that to the vapor barrier on the ground?


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