Coupled with water intrusion and outside air being ventilated into the crawl space, humidity is a major crawl space culprit. High humidity – any level above 50% – contributes to mold growth, unpleasant odors, failing support systems and more.

It’s common for crawl spaces to have high relative humidity and moisture. These conditions promote mold growth, especially on organic materials like wood and insulation. Moisture in the crawl space also can enter other areas of the home through wall, ceiling and floor cracks, and contribute to mold growth there. (Source: EPA)

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