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Stucco, brick, siding: none are a perfect barrier to water. So contractors put a layer just under a home’s outer wall called house wrap. That wrap has to be semipermeable to allow any moisture that collects behind it, whether from humidity or leakage, to evaporate out. But Delta-Dry is a completely waterproof wrap with a series of dimples and channels that keep it from ever being totally flush against a surface, so air flows freely around it, letting any moisture dry up
or drain out. 60 cents per square foot; delta-dry.com
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