Ignoring crawl space conditions and the effects they may have on indoor air quality seems to be a thing of the past.
Up to 50% of household-air can flow up from your crawl space, so it's important to keep this typically unsightly space as dry and clean as possible. Water vapors can enter the crawl space from the ground (even through cement), so many people are encapsulating their crawl space to keep the moisture out. Adding a crawl space vapor barrier and dehumidifier is widely accepted as the best way to improve indoor air quality. It will also make your home more efficient at using energy.
Encapsulating crawl spaces is becoming a popular solution for avoiding indoor moisture issues. For the average person, encapsulation can be compared to the lining added to swimming pools to avoid leaks. A heavy-duty polyethylene barrier is added to completely cover your crawl space - usually the floors, foundation walls, and sometimes even ceiling.
Water vapor and excess moisture can cause a slew of problems in your home. Since water vapor can move through porous cement, moisture from the ground can move through it and into your home. Here are common signs that lead people to sealing their crawl space: