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Years ago I heard of a builder in New Hampshire who installed polyethylene vapor barriers in houses and then cut them with a razor knife so "the house could breathe." Foolish and selfdefeating as that may seem, misconceptions about moisture movement in structures and the damage that moisture can cause still abound. If after reading countless articles and attending numerous workshops you still aren't sure about the difference between vapor pressure and relative humidity, or you pay careful attention to stopping diffusion but don't plug up cracks, Controlling Moisture in Homes is what you need. It's probably the best little primer on the subject I've seen, although somewhat overpriced for its size. In 36 pithy pages you'll learn how moisture moves,