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Why your chimney leaks when it rains

The most common chimney call in the wettest corner of the country, and the most commonly misfixed, because the stain almost never sits under the entry point. Water gets in high, travels the masonry, and shows up rooms away, weeks later. Guessing repairs against that is how homeowners buy the same fix twice.

The four usual suspects

The cracked crown, feeding water into the stack's core from the top. The missing or failed cap, letting rain fall straight down the flue. The flashing, the roof-to-masonry joint that roofers and masons blame each other for. And saturated brick, masonry that now absorbs more than it sheds, common on unsealed weather faces. Storm-only leaks, the kind that appear during big blows and skip ordinary rain, usually point at wind-driven entry through marginal crowns or flashing.

Diagnosis first, always

Visual inspection of crown, cap, and flashing, then controlled water testing section by section when the answer is not obvious. Testing isolates the entry point so the repair is targeted: crown work, a cap, a flashing reset, repointing, or a breathable repellent, whichever one the water actually chose. You get photos of the failure, not a shrug and a tube of caulk.

Common questions