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That's psychrometrics ...

Posted by JT on March 2nd, 2000 03:16 PM
In reply to Crawlspace by The Insulator on February 23rd, 2000 10:20 AM [Go to top of thread]

Sorry insulator, I'm not nitpicking your spelling,
I just want anyone who searches to get the right
info. BTW I agree with everything you have said.

Condensation is just one part of the problem.
Sometimes there is a high water table, or poor drainage that
can't reasonably be altered. In such cases you can
channel the water to a sump pump, but you will
still have wet ground. If you cover the ground (running
up the foundation wall) with pinhole free poly
such as Tu-Tuf and tape the joints, you will isolate
the house from the water. It also isolates the house
to an extent from soil gasses that can enter the house
due to the fact that crawlspaces and basements are
often souces of makeup air as heated air escapes.

With the vents closed and the foundation insulated,
I believe that the crawlspace will stay plenty warm
in all but the coldest climates, so putting a warm air
register there would probably only benefit extreme
cases. This is not an academic exercise, it is done
all the time; it is the approach favored by and
practiced by the building science community. As far
as expense, I don't see that the cost of poly and
foam board is prohibitive. Home Energy mag. has done
articles in the past on this, most of their issues
are on-line at

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