The answer to 'when to replace flashing' is that flashing should typically be replaced every 10-20 years, or sooner if it becomes damaged or worn. Flashing is the thin metal or plastic material used around roof penetrations, edges, and joints to prevent water leaks. Over time, flashing can rust, crack, or become dislodged, compromising the roof's integrity. It's important to regularly inspect flashing and replace it before it fails to maintain a watertight roof system.
Homeowners should visually inspect flashing during regular roof maintenance, looking for signs of wear like rust, cracks, or gaps. If flashing is damaged, it's best to have a professional roofing contractor replace it to ensure proper installation and sealing. Replacing flashing is a relatively inexpensive way to protect the roof and prevent costly water damage to the home.