Peeling paint in only some areas of this exterior suggests vapor was gradually making its way through from the inside, loosening the bond between the paint and the wall. Behind the peeling areas you’re likely to find a bathroom, kitchen, or other humid area without a good vent. If this were new, tightly-sealed construction, but still without a vent, it could have been worse: vapor migrating into a wall but unable to escape could have led to hidden mold. No wonder building codes are cracking down on proper bath and kitchen ventilation.

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