Chimney flashing is a critical waterproofing material—usually made of aluminum, steel, or copper—that seals the joint between your chimney and the roof, preventing water from seeping into your home. Without properly installed and maintained flashing, rain, snow, and moisture can easily penetrate the gap where the chimney meets the roof, leading to serious problems like roof rot, ceiling leaks, mold growth, and structural damage. It’s not just a minor detail—it’s one of the first lines of defense against costly water intrusion. A failing or missing flashing can quietly cause thousands in repairs before you even notice a leak inside. That’s why chimney flashing isn’t just important—it’s essential to the long-term health of your roof and home.