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9yr0ld t1_ja8vlsw wrote

I doubt there is any leak. that would show through the ceiling in time. you mentioned there is no insulation on the exterior wall there. so that's what is causing possible mold growth --- condensation from cold air meeting warm air in this space.

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threwthelookinggrass OP t1_ja8wvu7 wrote

Is the mold concern coming from the color of the vapor barrier of the insulation? I know that the insulation dates to around 1970 based on the parts I've already replaced in the lower walls. It wouldn't surprise me if there are small holes in the side paneling and I really doubt it has a moisture barrier on the outside.

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9yr0ld t1_ja8xa90 wrote

the vapor barrier and the studs by that vapor barrier look a little suspect. but I'm judging based on two pictures without much detail.

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