I was working on something else in the crawlspace under my mother's 1960 brick house in central North Carolina, and I noticed water dripping along the length of some of the HVAC ducts. These are the original 1960 rectangular aluminum ducts, insulated and wrapped in brown paper. I pushed on the underside of one, and more water squished out. I'm thinking that maybe that paper was treated to be a vapor barrier, but that treatment has failed, allowing moisture to seep in.
Her house is in a low area where the ground is hardly ever dry, so the crawlspace tends to be humid. There is a plastic vapor barrier on some of the dirt, but not all areas are covered.
On my own house, someone, probably within the last 15 years, replaced the crawlspace ducts with flexible insulated duct that's plastic on the outside, so I don't have this problem. Would that be the solution that my mother needs for her house?
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