Crawl Space Repair - High crawl space humidity

This is a hygrometer. It measures the relative humidity in the crawl space. Anything about 60-65% is considered a warning sign of future problems. As you can see, the reading here is over 75%. A measurement this high means that there is mold growing somewhere, even if you can see it or officially diagnose it. The conditions are perfect to grow mold, which spells disaster for a home.