What is the right humidity level for a crawl space?

Answer by  mammakat (11147)

50% RH is do-able, 45% is recommended, unless the space is vented to the outside, in which case you're not in control of humidity- in certain environments that may be beneficial, but if you're in the damp South, you want to get that sealed off and vented properly.

Answer by  sanityrose (2664)

The EPA recommends a relative humidity level between 30-40% in your crawl space. For the entire home, 60% RH should be the minimum achieved. Anything over requires home improvement.