Knowing when to replace chimney flashing is crucial for preventing water damage and maintaining the integrity of your chimney. Signs indicating the need for replacement include visible damage like cracks, gaps, or corrosion, as well as leaks or water stains on interior walls or ceilings near the chimney. Loose or missing flashing can also signal deterioration, compromising its ability to divert water effectively. Additionally, aging flashing that shows signs of wear from exposure to the elements may necessitate replacement. If you’re planning a roof replacement, it’s advisable to replace the chimney flashing concurrently to ensure a secure seal. Consulting with a professional chimney contractor can help assess the condition of your flashing and determine the best course of action to prevent costly water damage and prolong your chimney’s lifespan.