A crawlspace is a perfect environment for mold to grow. So what can you do to prevent this from happening? First of all, you should know that it is much easier for mold to grow when the humidity is at or above 70 percent. The best way to prevent mold is to keep your crawlspace dry. You can use a hygrometer to track humidity or visually watch out for condensation.
Proper insulation and ventilation is necessary to keep your crawlspace dry. If you find that it is moist, take action to fix your insulation and ventilation immediately. If you do notice mold already growing, a thorough cleaning and installation of a vapor barrier can fix the problem. It is likely that only professional help can solve your crawlspace mold problem if the fungus has already begun to grow.