Ventilated crawl spaces provide a source of moisture that can lead to mold, mildew, fungus and even structural decay. A crawl space can create environments that lead to severe health issues, moisture problems and increased energy usage. To prevent these issues, a crawl space needs to be sealed with a crawl space vapor barrier. The barrier stops water or moisture and helps to maintain humidity levels inside your home or business. In return, you are more comfortable, heating and cooling costs are reduced, and moisture related problems decrease considerably.