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Moment #24: Loose flashing around a plumbing stack
Pipe penetrations need tight flashing to stay watertight. If the flashing is loose or separated, water can enter around the stack and soak insulation below. This issue often causes localized attic moisture that appears after wind-driven rain. If you see staining near a vent pipe, inspect the flashing and surrounding shingles. Fixes here are typically straightforward and can eliminate recurring leaks quickly when caught early.