Flashing can be constructed from many different materials, so there could be many reasons your roof flashing was damaged. Generally speaking, flashing will be made from metal and should be resistant to issues like corrosion and rust, but over time they can still be susceptible to these problems. It’s good to check on them with regular maintenance so you will know when to replace them. If your flashing is made from PVC piping, prolonged sun exposure can start to break it down and make it weaker than your galvanized steel or aluminum options. When these damages occur, though, make sure to call the pros at A & B Home Improvement for quick and reliable repairs to prevent water from getting into your home or office.