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My parents built their family home in 1956. Mid century modern on conventional foundation in very humid Mississippi. As a kid throughout the 70's it was my job every couple of years to pull out all the old visqueen and roll in the new. Overlapped the joints never taped anything and all was fine. The vertical height of the crawl space was only about 2 feet so once I got bigger we quit replacing it. As of just a few years ago it was all fine under the house. Adequate foundation wall vents were probably the trick. As for the carpet pad can't help you there, but the same house that had beautiful hardwood floors had a pad and carpet put down in the 70's to cover it up as well. Apparently my Mom thought the house was too noisy with the wood floors. Never had any moisture issues in the house. You might try a bucket of unscented or lightly scented damp-rid in the room. I'm sold on that stuff for the house I'm in now. It works.
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