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In this video, Chris explains to a customer in Parksville, BC why the vents that are supposed to keep her home’s crawl space dry aren’t working.
Crawl space vents are actually one of the biggest fallacies in terms of building science. Builders formerly believed that, by opening vents to the crawl space, the air would “circulate” within the area – come in from one vent and out of the other, thus helping dry out ground water evaporation – which they believed to be the only source of crawl space moisture.
Recent developments in building science prove that there are two problems with that line of thought:
In other words, crawl space vents not only fail to keep the crawl space dry, they actually are responsible for aggravating the moisture problem during the summer. During the winter, they are carrying cold air into your home, making your floors cold, your rooms uncomfortable and your heating system has to work much harder and consume more energy to keep up.