This chimney didn't have any flashing! As a result, their ceiling needed repairs in multiple rooms. We suspected what might have caused this problem was a chimney flashing without any step flashing our counter flashing with aluminum.
To take care of this problem, we removed a few rows of shingles around the chimney, installed IKO Goldshield Ice and Water protector, reflashed the chimney, and added a new chimney cap. We knew with the change of the season this home owner would want us out there as soon as possible, so we were able to get over there within the next week.