Why install a vapor barrier?

About 40% of the air that we breathe at home originated in the crawlspace.
— Tracer gas studies completed by David Hales at Washington State University (2008

Without a vapor barrier, your crawlspace threatens indoor air quality and building durability.

Moisture from the soil supports the growth of mold and mildew. According to the Environmental Protection Agency,

“Moisture and contaminants [such as radon] can be driven into living spaces by the differences in air pressure between the crawlspace/basement and the living spaces above.”
Get ComfySarah Moon