Will air supply ducts in a poorly insulated wall present a potential moisture problem?
These are warm air supply ducts (3.25 x 10) in a 2×4 wall with just 3.5″ fg batt insulation. The ducts are against the interior face of the exterior board sheathing. This house has not been occupied in the winters (coastal maine) but is being renovated to be year-round. Prior to demolition we had planned to foam the wall cavities where interior finishes were stripped but did not know the walls were only 2×4. Will warm air traveling thru these ducts condense its moisture on the inside of the duct or cause condensation at the sheathing plane? In the dead of winter, will that air even be very wamr when it gets to the second floor?
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