Quote:
Originally Posted by wdfifteen
How does it get cold enough for water to condense on it?
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The attic is unheated. The attic floor is insulated with foam. Everything below that is part of the interior "thermal envelope" and conditioned by the central heating/cooling system.
My newer furnace should be removing excess interior humidity both summer and winter...when it's run...but I suspect a small amount of warm humid air is getting past the ceiling access port seal. Need to fix that as well.
Wherever warm and cold air/surfaces mix, a localized dew point is created and water condenses.
It's like filling up a cold toilet tank when it starts sweating and dripping pools on the floor.
The ground water for the first floor toilet is colder and that's where it occurs first.