Crawl spaces have a major impact on indoor air quality. When you take a breath inside your home, you are breathing in a lot of crawl space air -- up to 40% of the air we breathe comes from the crawl space or basement. How is this possible? It all has to do with air flow. Warm air rises. Warm air molecules are farther apart than when it’s cold, making it lighter. It’s the reason why hot air balloons float. In a home, warm air is expelled through the attic. But the air that exits your home has to be replaced with other air. Otherwise, we would all be wearing oxygen masks! The big question is where does the replaced air come from? Of course, some of it seeps through the windows and doors, but much of our indoor air is sucked up from the crawl space or basement.
When it comes to air movement, your house works like one big chimney; air starts at the bottom and cycles its way up and out. If the air quality in your crawl space is bad because it has become a breeding ground for allergens such as mold spores and dust mite droppings, that tainted air finds its way into your bedrooms, into your kitchen, and everywhere else. No room is exempt. Crawl space air filled with nasty airborne particles spreads all over your home like a bad rash.