i have an 1845 home in Boston with a field stone/granite foundation and dirt floors. The basement never gets water but gets very humid/ mildewy in the summer. if i put down a layer of 6 mil poly with 1 in rigid foam over that and then 2×4 sleepers, could i put OSB on top of that for flooring? Is the rigid foam necessary? How far up the wall should i run the vapor barrier?
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My advice would be to put in an assembly that didn't have wood and wood based products as these do very poorly in moist environments. Most basements have a concrete slab for this reason. Poured on a well sealed poly vb on several inches of clear crushed gravel, you should notice a marked decrease in the humidity.