The answer to why your flashing is damaged is that it can be caused by a variety of factors, including weathering, improper installation, or physical damage. Flashing is the thin metal or plastic material used to create a waterproof seal around roof penetrations, joints, and edges. When it becomes damaged, it can allow water to leak into your home, leading to potential structural and interior damage.
Common symptoms of damaged flashing include visible cracks, holes, or separations, as well as water stains or leaks around the affected areas. Solutions may include repairing or replacing the flashing, depending on the extent of the damage. In some cases, you may be able to DIY minor repairs, but for more significant issues, it's best to call a professional roofing contractor to assess the problem and provide the appropriate solution.