
A bungalow-belt chimney serving the boiler nobody thinks about?
- A 1910s–20s brick bungalow or two-flat
- Fireplace and heating plant sharing one stack
- A sweep history that only ever mentions the fireplace flue
Why it happens in Illinois: Illinois chimney work is dominated by its pre-war brick: bungalows, two-flats and greystones whose stacks serve fireplace and heating plant together. The shared flue that was modernised on the appliance side and never on the masonry side is the state's classic hidden fault.
What fixes it, and what it costs
The pre-war arrangement here put fireplace and boiler up the same masonry, and modernising the boiler without relining its flue left an oversized, cool run quietly deteriorating behind a fireplace that looks fine. Every flue in the stack gets the camera; the boiler flue usually needs the liner; and the fireplace side finally gets an honest verdict too.
- Stainless liner, insulated, full height
- $2,500–$6,000
- Stainless for a stove or insert
- $1,800–$4,000

























