
Sure the whole stack was inspected, or just the fireplace?
- A pre-war house whose chimney serves the furnace or boiler too
- A sweep receipt that lists one flue, in a stack built for two or three
- Rust, damp or smell near the heating flue nobody ever opens
Why it happens in Altadena: 38% of Altadena's homes predate 1940. Houses of that era ran fireplace and heating plant up the same masonry stack, and when the heating was modernised the shared flue usually was not. An oversized, cool-running appliance flue condenses and deteriorates for decades behind a fireplace that looks perfect, and a quote that covered "the chimney" often covered one flue of three.
What fixes it, and what it costs
A camera pass down every flue in the stack, not only the one behind the damper. It is the only way to see breached tiles and open joints between flues, and on older stacks it is the difference between an inspection and a look. If a liner has failed, relining that flue is the repair, and knowing before winter beats finding out during it.
- Second or third flue in the same stack
- +$80–$150 each
- Level 1 with an annual sweep
- $0 — included
- Level 1 on its own
- $100–$180
























