Yes, step flashing absolutely needs to be replaced when replacing a roof, and replacement should be considered mandatory standard practice for a quality, warrantable roofing job. Step flashing consists of small L-shaped metal pieces interwoven with shingle courses along sidewalls and chimneys to prevent water infiltration, and it is the most critical flashing for preventing leaks at roof to wall intersections. When old shingles are removed, step flashing is typically bent, deformed, or damaged during removal, and its sealant and fasteners are aged, making it unable to form a proper watertight seal if reused. Even if it appears intact, old step flashing may have hidden corrosion, pinholes, or fatigue cracks that will cause leaks on the new roof. Reusing old step flashing is considered poor workmanship and a common source of future leaks, and it may void shingle manufacturer warranties from GAF, Owens Corning, and others that require new flashing for full warranty coverage. The cost of new step flashing is relatively small, typically a few hundred dollars for materials, compared to the cost of repairing interior water damage from leaks caused by reused flashing. A reputable roofing contractor will include removal and replacement of all step flashing in their written estimate, using quality materials like galvanized steel, aluminum, or copper properly integrated with new shingles. If a roofer suggests reusing old step flashing to lower the bid, that is a red flag.
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