Aluminum step flashing typically lasts 20 to 30 years when properly installed, making it a durable option that often lasts as long as an architectural shingle roof. Aluminum is naturally resistant to rust, unlike galvanized steel which can rust in 15 to 25 years, so it performs well in many climates. However, its lifespan depends on several factors. Installation quality is critical, as aluminum must not be in direct contact with dissimilar metals like copper or with concrete or pressure-treated lumber, as galvanic corrosion can cause premature failure. In coastal environments with salt air, aluminum can experience pitting corrosion that shortens life to closer to 20 years. In moderate inland climates with proper installation, it can reach 30 years or more. Compared to other materials, aluminum lasts longer than galvanized steel but not as long as copper which lasts 50 to 100 years or stainless steel which lasts 30 to 50 years. When replacing a shingle roof, which is typically every 20 to 30 years, aluminum step flashing should be replaced as well, as its sealant and fasteners age and reusing old flashing risks leaks. For maximum longevity, choose heavy-gauge aluminum, ensure it is properly integrated with shingles using step flashing techniques rather than caulk, and use compatible sealants like polyurethane. Regular inspections every few years help detect early corrosion.
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