Crawlspace Condensation

March/April 2001
A version of this article appears in the March/April 2001 issue of Home Energy Magazine.
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March 01, 2001
            Crawlspace Condensation Q:I was called to a doublewide mobile home to investigate a problem with a 4- year-old duct system (the original duct system was no longer being used). Looking down the supply registers, I noticed moisture between the inner liner and the insulation. As I crawled into the crawlspace, I saw that the flex ducts were soaked. The condensation was “raining” off the duct. A previous contractor had even poked a hole in a duct to drain out the water. The duct system should be replaced, but that will not fix the problem. There are outside air vents into the crawlspace. How do I fix the problem, and not just the ducts? A:Whenever there is a moisture problem anywhere in the home, you have to ask, “Where did the moisture come from?” You seem to suspect that the crawlspace vents may be involved, and I bet they are. These vents are not removing moisture from the crawlspace. They are adding moisture.          The outdoor air in Terre Haute has a dew point above 64°F for more than 1,000 ...

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