San Antonio experiences periodic hard freezes that catch homeowners off guard. When temperatures drop into the low 20s, water trapped in gaps around poorly installed chimney flashing expands as it freezes. This expansion forces the metal away from the chimney and roof surface, creating larger gaps. When temperatures climb back into the 60s the next day, the ice melts and water floods through those newly widened openings. This freeze-thaw cycle repeats several times each winter, progressively worsening even small flashing defects. Homes built in the 1970s and 1980s often have original chimney flashing that has endured 40-plus freeze-thaw cycles, which explains why so many develop sudden leaks after a cold snap.
San Antonio building inspectors pay close attention to flashing details because substandard work causes so many insurance claims in this region. If you are refinancing or selling your home, an inspector will flag improperly installed or deteriorated chimney flashing, potentially delaying your transaction. Working with a local roofing contractor who understands city inspection standards and can pass the first time protects your timeline and investment. Summit Roofing San Antonio has built relationships with inspectors across Bexar County through years of quality work and code-compliant installations. When we complete your chimney flashing repair, you get documentation that satisfies both insurance adjusters and building officials.