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The house was less than a year old when the owner called me in late February to investigate persistent roof leaks that the builder had been unable to repair. The water seemed to be coming in around the skylights, leaving moisture stains above and below the openings. The builder had tried to fix the problem by removing the asphalt shingles around the skylights, installing waterproof membrane, and re-flashing the curbs. At first, the problem seemed straightforward, but when I asked some follow-up questions, the symptoms and timeline didn’t add up.
The house was built in the fall and the owner moved in just before Christmas. Moisture stains appeared within a couple of weeks. Roof repairs were done in mid-January, but new stains showed up soon after.