Crawl space encapsulation is a preventative measure taken to seal off a crawl space, using heavy-duty polyethylene barriers to cover the crawl space floor and walls. This technique effectively locks out moisture, humidity, pests, and prevents mold growth. The primary goals are to enhance indoor air quality, protect the structural integrity of the home, and increase energy efficiency. Proper encapsulation often includes the use of a dehumidifier to regulate moisture levels.