How long roof flashing should last depends on material quality, installation quality, and environmental exposure, but quality flashing should last as long as the roof covering when properly installed. Galvanized steel flashing, the most common economical option, typically lasts 15 to 25 years before rust begins, especially in humid, coastal, or industrial environments where corrosion is accelerated. Aluminum flashing lasts 20 to 30 years but can corrode if in contact with dissimilar metals or concrete. Copper flashing is the most durable, lasting 50 to 100 years, often outlasting two or three asphalt shingle roofs, and is considered a lifetime material. Lead flashing also lasts 50 plus years. Stainless steel flashing lasts 30 to 50 years. However, lifespan is heavily dependent on proper installation. Flashing that is properly integrated with step flashing techniques, sealed with compatible sealants, and not relying solely on caulk will last much longer than flashing that is simply caulked in place. Environmental factors like salt air, acid rain, and heavy snow and ice can shorten lifespan. Flashing should be inspected every 2 to 3 years for rust, cracks, gaps, or separation. When replacing a shingle roof, which is typically every 20 to 30 years, flashing should always be replaced as well, as reusing old flashing is a common cause of leaks on new roofs.
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