Here in the Carolinas many homes are built over a crawl space. The foundation typically has 6”x10” vents in order to exchange outside air with the crawl space air. The original intent was to let the good air in and let the bad air out. Sometimes the system doesn't work the way it was intended. The soil under your home is typically 50 to 55 degrees and does not get any sunshine. The outdoor air can be hot and humid for six months of the year. So what happens when hot air hits cold soil? Condensation. This condensation is enough moisture to trigger unwanted mold growth in the crawl space. This creates is a giant kind of Petri Dish below your home.
Building science tells us that air in a building rises. Sooner or later the air in the crawl space rises upward into the living space and eventually the attic.
Many crawl spaces become neglected areas where very few people enter and the people that do are not always there to improve the space but to repair plumbing, electrical and HVAC systems, or kill unwanted pests.
Not all crawl spaces are alike. Some buildings sit in a moist area, some sit on a dry area, some are susceptible to poorly designed foundations or broken household systems.
Your crawl space can harbor molds that are dangerous to humans, or dangerous to the structure itself. A crawl space inspection is recommended to determine the condition of this area and its influence on the health of your home.