Slate and chimney flashing leaks happen when the metal strips that seal the space between the chimney and the roof become damaged, loose, or improperly installed. Flashing is essential for keeping water from sneaking in around the chimney where it meets the roof. Over time, weather exposure and natural settling can cause flashing to crack, warp, or pull away from the roof or chimney surface. Because slate shingles are heavy and fragile, shifting or broken slates around the chimney can also create gaps. Simple signs of flashing leaks include water stains or dampness around the chimney inside the attic or ceiling, and visible gaps or rust on the flashing itself. Homeowners can do a safe visual check from a ladder or the attic by looking for cracked or rusty metal, cracked sealant, and loose slate near the chimney base. Avoid walking on slate as it’s fragile and can break easily, leading to worse issues.
If you spot potential leaks or worn flashing, it’s wise to call a roofer who knows slate and chimney interfaces, since improper repairs can void slate warranties and cause damage. A professional roofer can assess if the flashing needs partial repairs, resealing, or a full replacement, and if the surrounding slates must be reset or replaced. When contacting a contractor, ask, “How do you ensure the new flashing integrates correctly with brittle slate without causing damage?” and “Do you offer warranty coverage on both workmanship and materials for chimney flashing repairs?” These questions help ensure you hire someone experienced with slate roofing and chimney flashing issues and can provide lasting, code-compliant repairs.