The answer to 'how long does flashing repair last' is that properly installed and maintained flashing can last 15-30 years or more. Flashing is the thin metal or plastic material used around roof penetrations, edges, and joints to prevent water leaks. When flashing is installed correctly and the roof is well-maintained, it can provide decades of reliable protection against roof leaks.
However, flashing can degrade over time due to weather exposure, physical damage, or improper installation. Factors like the flashing material, roof type, climate, and how much the roof is exposed to the elements will affect the lifespan. Regular inspections and prompt repairs are important to maximize the lifespan of roof flashing.