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Ron Canneli is a certified crawl space environment specialist, and actually was among those who pioneered the crawl space encapsulation technology in New England.
His company, Northeast Basement Systems Boston has fixed thousands of crawl spaces in in Greater Boston, and SE New Hampshire, since 2002!
In this Ask the Expert video, Ron explains how crawl space vents, which are supposed to keep the crawl space dry, actually contribute to make the environment damp.
I warm days, the open vents bring the moisture from the outside air into an environment that is much cooler causing condensation.
That moisture gets into the wood and insulation, creating the perfect environment for mold to thrive. The vast majority of the times, that musty smell that comes from the crawl space is associated with and caused by mold.