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moisture, pressures, etc

Posted by JT on June 2nd, 1998 03:15 PM
In reply to old man by Chris Procyk on June 2nd, 1998 08:40 AM [Go to top of thread]

Chris, unless you know what to look for, a visual
may not help much. There is an easy test you can do.
Close all windows and exterior doors, fireplace flues,
etc. and open interior doors. Crack your front door
an inch or so, then turn on the air furnace air handler
and note whether and which way air moves through the door.

Your basement doesn't have to have standing water
to supply a good deal of moisture. You can tape down a
sq. yd of poly for a couple days to see what collects
under it, if it's bone dry look for other sources of

Anything that alters the pressures in the house should
be looked at, so your whole house fan is worth considering.
This should depressurize the house and pressurize the
attic. The degree to which the attic is pressurized
will depend on the net free vent area. It's conceivable
that wall cavities are being pressurized via plumbing
and electrical penetrations through wall top plates,
and other air connections. To test for this, turn on
the fan an remove the cover of a wall switch one of the
affected exterior walls. Put your face up close to
see if you can feel any air movement.

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