
A coal-era chimney serving a modern furnace?
- A pre-war house whose stack once served coal heat
- A furnace or boiler venting into old, oversized masonry
- Crumbling joint material inside the flue, visible only on camera
Why it happens in Connecticut: New England center-chimney colonials put the stack in the heart of the house: a massive masonry core serving multiple fireplaces, often unlined, and later cut into for oil or gas. Those conversions are where the trouble hides, because the flue nobody looks at is the one the furnace has been quietly using for decades.
What fixes it, and what it costs
Coal exhaust spent decades attacking these flues from the inside, and the conversion to gas made them oversized and cool-running: condensation finishes what the coal began. The camera tells the truth the exterior hides, and the repair is a correctly sized liner in the affected flue: it fixes the draft, the condensation and the deterioration in one move.
- Stainless liner, insulated, full height
- $2,500–$6,000
- Stainless for a stove or insert
- $1,800–$4,000

























