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A wet crawl space is one of the most frequently overlooked sources of moisture problems in residential buildings. Because most homeowners rarely enter their crawl space, conditions there can go unaddressed for years — and elevated moisture in a crawl space is generally considered one of the more significant risk factors for mold development in the home above it.

Why Crawl Spaces Tend to Be Wet

Several conditions are commonly associated with elevated moisture in crawl spaces:

Ground moisture vapor. Soil naturally releases moisture vapor, and in an unencapsulated crawl space, that vapor moves upward into the crawl space air. This is genera...