Quote:
Originally Posted by Mass_nerder
It could be the roof, but that's also what I would expect to find if you were having issues with your air barrier.
Basically, there is a temperature gradient from your exterior cladding to your interior gypsum. Somewhere in that gradient is your dew point where the humidity in the warm conditioned interior air would condense. This typically happens somewhere in your insulation. So the name of the game is keeping that warm humid air from getting to the dew point. Typically in wood frame construction, the air barrier stopping that interior air would be between your interior gypsum and the stud. If that barrier is improperly installed, or missing completely in that area, there isn't anything stopping the interior air from condensing in the wall cavity and leaving your insulation wet.
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Air barrier is on the outside. Vapour barrier, generally 6mil poly is on the inside.