The answer to 'how to maintain flashing' is to regularly inspect and maintain the flashing on your roof. Flashing is the thin metal or plastic material used to seal the joints and gaps around chimneys, vents, and other roof penetrations. Proper flashing maintenance is essential to prevent roof leaks and water damage.
To maintain flashing, you should visually inspect it at least once a year, ideally in the spring or fall. Look for any cracks, holes, or areas where the flashing has become loose or separated from the roof. If you find any issues, you'll need to repair or replace the flashing. This may involve re-sealing the flashing with a high-quality sealant or replacing the flashing entirely. For more extensive damage, it's best to call in a professional roofer.