How do you inspect your own chimney for leaks and damage?
Short answer. Inspect a chimney from three safe vantage points: from the yard with binoculars for the cap, crown, bricks, mortar and flashing; from the attic for water stains, wet framing and daylight around the chimney; and from the hearth for rust, water and debris. Photograph anything you find, and leave climbing, the flue interior and repairs to professionals.
From the yard
- Cap: present, straight, not rusted out or clogged.
- Crown: cracks, missing chunks, or plants growing on top.
- Brick and mortar: recessed or missing joints, flaking brick faces, white mineral stains.
- Flashing: lifted edges, thick tar patches, or rust streaks on the shingles below.
- Behind the chimney: a cricket on wide chimneys, or debris piled on the uphill side.
- Alignment: leaning, or a gap opening against the house.
- Framed chimneys: a rusted or flat chase cover, loose siding around the chase.
From the attic
- Stained or dark decking and rafters around the chimney.
- Damp insulation, mold, or a musty smell nearby.
- Daylight through gaps where the chimney meets the roof.
- Clearance: wood framing should not touch a masonry chimney; the code calls for an air space, 2 inches for chimneys inside the house.
From the hearth
- Rust on the damper or firebox, water staining, crumbling mortar.
- Debris, nesting material, or fallen liner pieces.
- Stains on the wall or ceiling beside the chimney breast.
Then what
Photograph and date what you find, and note when leaks happen, such as only in wind-driven rain from one direction or only in long storms. That record shortens diagnosis. Have a certified sweep inspect the flue yearly if you burn anything, and a roofer handle flashing, crickets and decking. See chimney leaks and crickets and what to expect in a roof inspection.