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wet crawlspace

Posted by JT on August 18th, 1998 07:17 PM
In reply to sweating crawl space by Kevin Ortiz on August 18th, 1998 04:07 PM [Go to top of thread]

Kevin, the solution depends to some degree on where
the water is coming from. If the ground, the answer
may be to cover it with poly. If not the ground, the
water is most likely coming from ambient humidity
through all the venting you're doing. Of course, it
could be a combination of the two. Test for ground
dampness by laying down a square yard of poly for a
couple of days (pile dirt on the edges to seal). If
you find moisture under it, you know what to do. In
humid climates, the vents should be blocked off, and
in some cases a dehumidifier is necessary. You might
want to run one at least temporarily to get things
dried out, but stopping the moisture source is the
only real answer.
Regardless of where the moisture is coming from you
want to eliminate your ducts as a condensing surface
so make sure your AC ducts are air sealed (with mastic,
not duct tape), and insulated with a foil or vinyl
outer layer. This outer lay must also be sealed to
keep moisture out or the insulation will just get

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