A chimney fire can start, roar, and burn itself out in under a minute. Plenty of homeowners never hear a thing — no alarm, no flames at the top, just a strange rumble they blame on the wind. The damage, though, does not go away when the noise does. The part that takes the beating is the flue liner, and a cracked liner is what turns a one-time scare into a carbon monoxide problem the next time you light a fire.
By James Rodriguez, Central Chimney Service.
We see this pattern every fall around Aurora: a homeowner burns a few loads of wood that were not quite dry, creosote builds fast, and one hot fire ignites it. Here is how to tell whether your liner took damage, and what an inspection actually looks for.
What a chimney fire does to a flue liner
A chimney fire pushes flue temperatures far past anything a normal fire produces, and the liner expands faster than the masonry around it. Clay tile liners crack, shift, or blow out chunks; stainless steel liners buckle, discolor, or separate at the seams. Either way the flue loses its sealed path, and combustion gases can leak into wall cavities and living space instead of going up and out.
That is the real risk. The fire is over in seconds. The compromised liner stays compromised through every fire you build afterward, quietly venting carbon monoxide where it does not belong.
Signs your liner was damaged
Most of the evidence is visible from inside the house or from the roofline. Look for these:
- Puffy, honeycombed creosote on the smoke shelf or damper. Creosote normally looks flat and tarry; after a fire it expands into a crusty, popcorn-like texture.
- Pieces of clay tile in the firebox or on the smoke shelf. Tile fragments do not fall on their own.
- A cracked or warped damper plate, or a damper that suddenly will not seat.
- A discolored or warped chimney cap, or a cap that has been pushed loose.
- Heat-damaged roofing shingles or scorching on the crown around the flue opening.
- New cracks in exterior masonry, especially vertical cracks running with the flue.
- A strong burnt smell that lingers for days and gets worse in humid weather.
Any one of these is reason enough to stop using the fireplace until someone has looked inside the flue.
Why a camera inspection is the only honest answer
You cannot judge a liner from the firebox with a flashlight. The damage is usually higher up, at the smoke chamber or in the middle third of the flue, where the hottest gases move fastest. A camera chimney inspection runs a lens the full height of the flue and shows the tile joints, the liner seams, and any gap that opens into the surrounding masonry.
After a suspected chimney fire, that is a Level 2 inspection — the standard used after any event that could have affected the structure, and the same one required when a home changes hands. It documents what happened rather than guessing at it.
Repair, reline, or rebuild
If only a couple of tile joints opened, targeted masonry repair may be enough. If several tiles are cracked or the liner has shifted, relining with a stainless steel liner is usually the better outcome: it restores a continuous sealed path, sizes the flue correctly for your appliance, and does not care what the original clay is doing anymore. Our prices are posted up front on the pricing page before we start — no surprises after the fact.
Preventing the next one
Chimney fires are a creosote problem, and creosote is a fuel-and-airflow problem. Burn seasoned hardwood only, give the fire enough air instead of damping it down overnight, and get the flue swept on schedule. There are more habits worth building in our DIY chimney care guide.
Central Chimney Service is insured and bonded, and I have spent 29 years working on chimneys in this area. If you think you had a chimney fire — even a small one — call (815) 305-5510. We answer seven days a week, 7 AM to 7 PM, and we serve homes throughout Aurora and the surrounding neighborhoods.
Frequently asked questions about this topic
How do I know if I had a chimney fire if I never heard one?
Look for physical evidence rather than memory: puffy honeycombed creosote, clay tile fragments in the firebox, a warped damper, a loosened chimney cap, or a burnt smell that lingers for days. A camera inspection confirms it either way.
Can I keep using my fireplace after a chimney fire?
No. Stop using it until the flue has been inspected. A chimney fire commonly cracks the liner, and a cracked liner can vent carbon monoxide into the house during the next normal fire.
What kind of inspection do I need after a chimney fire?
A Level 2 inspection, which includes a camera scan of the full flue. That is the standard used after any event that may have affected the structure of the chimney.
Does a chimney fire always crack a clay tile liner?
Not always, but it is common. Clay tile heats unevenly and expands faster than the masonry around it, so cracks, shifted joints, and spalled tile faces are typical findings.
Is relining always necessary after a chimney fire?
No. If only one or two joints opened, targeted repair may restore the flue. Relining is recommended when multiple tiles are cracked, the liner has shifted, or the flue is the wrong size for the appliance.
Will my homeowners insurance cover chimney fire damage?
Policies vary, so check with your carrier. A documented Level 2 inspection report with camera images gives you the evidence most carriers ask for.
What causes most chimney fires?
Creosote buildup from burning unseasoned wood, or from damping the fire down too far for too long. Both leave unburned fuel condensing on the flue walls.
How soon can someone come look at my chimney?
Call (815) 305-5510. We take calls seven days a week from 7 AM to 7 PM and can usually schedule an inspection quickly, especially before heating season gets busy.
Published September 17, 2026 · Last updated September 5, 2026