Flex Seal tape on a roof is considered a temporary emergency repair, not a permanent solution, and its lifespan varies widely based on conditions, but typically lasts 6 months to 2 years before needing replacement or permanent repair. Flex Seal tape is a thick, rubberized waterproof tape with strong adhesive that can stop active leaks quickly when applied to small cracks, punctures, or around flashing. In ideal conditions with proper surface preparation, dry surface, moderate temperatures, and protected from direct UV, it may last 1 to 2 years. However, several factors reduce its lifespan. Exposure to intense UV radiation degrades the rubber over time, causing cracking and peeling. Extreme temperature fluctuations cause expansion and contraction that weakens adhesion, especially on asphalt shingles that also move. Water ponding, foot traffic, and debris can lift edges. Flex Seal is not asphalt-compatible for long-term use and can trap moisture underneath, potentially causing more damage. Shingle manufacturers warn that non-approved coatings and tapes can void warranties. Professional roofers recommend using Flex Seal tape only to stop active interior water damage until a permanent repair with asphalt roofing cement and new shingles or proper flashing can be done within weeks to months. For best temporary results, clean the surface thoroughly, apply tape extending 6 inches beyond the leak, press firmly, and plan for permanent repair as soon as possible.
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