Many homeowners wonder It is normal to have moisture in my crawl space? You might expect there to be a certain amount of moisture from humidity, flooding, or plumbing leaks within your crawl space, but is it normal for the crawl space to be damp?  Many people don’t realize that over half of the crawl space air makes its way into their living space. Having high humidity in your crawl space also makes the humidity in your home high. Crawl Space Humidity Affects Your Home Having the humidity at a reasonable level can improve indoor air quality. Keeping the humidity under control in your crawl space helps to lower the risk of bacteria, mold, virus, and other indoor air quality pollutants in your home. The stack effect will move the …