Is it normal to see black dots of mold on floor joists?

Common molds are present in almost every crawl space. Minor spots of mold on floor joists may not be an issue but it is important to fully inspect your crawl space for hidden areas of more extensive mold (Which can develop into dry-rot), standing water, hidden plumbing leaks or other problems under your home.

A full inspection of your crawl space is the best way to determine if your have any moisture problems. Many issues may not be visible from a quick peek inside your crawl space door.