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We refer to the rubber pad as waffle pad. It does break down with age. It's better than it was 40 years ago but you pay for it and there are way better pads out there now. A quality pad translates into density not thickness. But that's not your problem nor will a good padding solve it. I'd say ventilate the crawl space better. Double or triple the amount of vents around the house and staple up some 10 mil visqueen to the under side of the floor as a vapor barrier if possible
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