condensation on duct work in crawl space

Old 08-23-04, 05:39 AM
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condensation on duct work in crawl space

We live in South Carolina. 100% humidity. Our duct work in the crawl space is dripping under the house. In order to get our reduced electric rate we put a vapor barrier to cover the ground. There is so much condensation that water is dripping off the duct work and puddling in places on the plastic vapor barrier. We are concerned about mold. The soil is sandy here and drains well and we are thinking about pulling the plactic vapor barrier out. Any suggestions or thoughts are appreciated. We have a package heat pump system. Thanks.
Old 08-23-04, 09:52 AM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
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You dont say what all you have down there. All vents should be sealed up. The ground should have a 6 mil poly on it. 2' over lap and all seams taped. up the wall some 12"
There Id say a 2 " polystyrene on the walls .Up to the joist. A R19 cut to fit up in the joist there just on the sill plate all around the home. Now 2 small registers in teh duct work down there and one in the return if you can.
This will dry it out and work as a heat sink for you all year.
We do all crawls this way and they are almost all heat pumps.

Go look at

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