Moisture can be behind a low-permeance coating even when the exposed surface has dried.
The short explanation
Moisture can be behind a low-permeance coating even when the exposed surface has dried.
What to compare
Compare location, timing, weather or operating cycle, then open the matching Living House layer to see the plausible routes.
What would strengthen the explanation
A repeatable trigger and a physical route through the nearby assembly are stronger than appearance alone.
Next step
Document the original condition and choose the least destructive check that can separate the leading explanations.
Observe→Compare triggers→Repair source→Verify outcome
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