The answer to 'how often to replace flashing' is that flashing should generally be inspected and replaced every 10-15 years, or sooner if it shows signs of wear or damage. Flashing is the thin metal or plastic material installed around roof penetrations, chimneys, skylights, and other areas to prevent water leaks. Over time, flashing can become corroded, cracked, or loose, compromising its ability to keep water out of your home. Regular inspections and timely replacement are important to maintain a watertight roof.
Replacing flashing is a job best left to professional roofers, as it requires specialized skills and tools. Attempting DIY flashing replacement can lead to further damage if not done properly. If you notice any issues with your flashing, it's recommended to contact a licensed and insured roofing contractor to assess the situation and make necessary repairs or replacements.