Leaks
Chimney leaks rarely come from one obvious hole — they're usually a combination of a worn cap, cracked crown, failed flashing or weathered masonry, and water can travel before it shows up as a stain.
Leak repair starts with tracing the water back to its actual entry point, which is often higher up or further from the visible stain than expected, since water follows gravity down the inside of the chase or along the flue before it becomes visible. Once the source is found, the repair matches whatever component let the water in.
Common entry points include a missing or rusted-through cap, a cracked or unsealed crown, flashing that's lifted or separated from the roofline, and masonry sealant that's worn away after years of sun and rain exposure. More than one of these is often involved at once.
Diagnosis starts at the top of the chimney and works down, since that's the direction water actually travels. A camera inspection of the flue paired with an exterior check of the cap, crown and flashing usually identifies the source, and the repair is scoped to seal it — not just patch the symptom inside.
Freeze-thaw cycling in cold climates turns a small crown crack into a bigger one every winter; heavy storms and tropical systems in warmer, wetter climates push water through gaps that a dry season never reveals. Either way, a leak rarely stays the same size — it's worth addressing as soon as it's noticed.
FAQ
Chimney Leak Repair