Couple of different things here.....one dryer load of exhaust air
equals approx two pints of water in the form of a vapor. If you have
a cold roof with insulation below the inner roof, when the dryer vapor
is exhausted and contacts the underside of the roof sheathing on a
cold winter day it will condense on contact and revert to a solid form
more commonly known as water. It will then either freeze until warmer
temps or run down the sheathing and drip into the insulation. It will
ruin the insulation and eventualy find its way into the sheetrock.
Also will, with time, ruin the roof sheating.
Bottom line vent dryer exhaust outdoors away from the structure.
Canadian codes, for example, say 'never' vent into attic. Even a well
ventilated one, which some are not.
Reason being that all those pounds of a water can condense up there,
cause rot and mould and roof deterioration. Possibly freeze on
underside of roof and or the roof nails sticking through. Then melt
and drip on ceiling insulation and ceilings. Wet insulation then
useless. And that's not just because many parts of this country are in
Stupid idea. Even drying clothes inside a well sealed house without
adequate ventilation can and has caused severe problems to the
structure. Don't do this to a roof attic. After few years could be a
very expensive repair!
Don't know where you live, but here in FL a lot of dryer vents go
through the attic and out the roof. My vent kept getting clogged so I
called a man who fix ed my neighbors - he rerouted it. It goes up to
the attic and across to the soffit and outside there. It has worked
fine since he moved it. If I sell the house, the new owner can take
his choice of how to do it.
On Fri, 28 Sep 2007 20:14:09 -0400, "Joseph Meehan"
Warm moist and dusty air is a waste product. It doesn't have much
value and should be vented outside. There are heat recovery devices
available (diversion vents, etc.) but you have to ask yourself if you
realistically use the dryer enough for these to be economically
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