The answer to 'why is my flashing worn out' is that flashing can become worn out and damaged over time due to exposure to the elements. Common causes include corrosion, cracking, and loosening of the flashing material. Symptoms may include leaks around roof penetrations, visible gaps or holes in the flashing, and water damage on the interior walls or ceiling.
In many cases, worn flashing can be repaired or replaced by a professional roofing contractor. However, some DIY homeowners may be able to replace simple flashing around small roof features like vents or chimneys. It's important to properly prepare the area and use the right materials to ensure a long-lasting repair. For more extensive flashing issues or if you're unsure, it's best to call in a professional roofer to evaluate the problem and provide the best solution.