Basement Mold and Water
Exposed dirt floors in basements and crawl spaces are problematic due to the moisture rising on convection driven air flow. Moisture can reach the upper levels of building through utility chases, voids, and stairways via stack effect http://www.epa.gov/iaq/largebldgs/pdf_files/sec_2.pdf transporting indoor air contaminants with it.
Including the crawlspace or basement in the building’s overall thermal boundary optimizes energy efficiency and creates more effective moisture control. Encapsulating dirt floor crawl spaces and basements without insulating the exposed subfloor www.myhomescience.com/insulating-crawl-space/ better regulates building temperature.