Get everyone out of the house first.
Call 911 from outside, not from the kitchen phone. If you can reach the damper without walking through smoke, close it to cut the air supply. Never throw water on a chimney fire. The steam and thermal shock can crack the flue tile.
Any chimney fire, even one that looked small from the yard, is exactly when NFPA 211 requires a level 2 inspection before anyone burns in that fireplace again. That’s not optional, and it’s not upsell. It’s the national standard, and skipping it means guessing whether the flue is still sound.
What are the signs of a chimney fire?
The clearest signs are a loud roar or rumble from inside the wall, dense black smoke pouring from the top of the chimney, and a heavy hot smell like a chemical fire. The exterior wall may feel hot, and you might see sparks or flame above the cap.
Here’s how that compares to an ordinary fire behaving normally:
| What you notice | Chimney fire | Normal fire |
|---|---|---|
| Sound | A roar or rumble, like a low jet engine, coming from inside the wall or flue | Crackling and popping from the logs themselves. Nothing from the chimney |
| Smoke from the chimney top | Thick, black, and continuous | Thin and gray, or none once the fire’s established |
| Smell | Heavy, hot, almost chemical | Ordinary wood smoke |
| The chimney itself | Hot to the touch on an exterior wall, sometimes vibrating | Warm, never hot enough to worry about |
| What’s visible outside | Sparks or flame shooting from the top, sometimes a glow at the mortar joints | No flame above the cap, maybe a stray spark off a fresh log |
Two of those together is enough. You don’t need all five to treat it as real.
What do I do in the first 90 seconds?
In order, that looks like this:
- Get everyone out of the house, including pets, and shut the door behind you.
- Call 911 from a phone outside. Say “chimney fire,” not “house fire.” It changes how fast a truck rolls and what gear they bring.
- If the fireplace has glass doors, close them before you leave the room.
- Close the damper only if you can reach it without walking back into smoke. Don’t force it if it’s already hot.
- Do not throw water on the fire and do not aim a fire extinguisher up the flue.
- From outside, watch the roofline for sparks landing on the shingles and tell the crew when they arrive.
None of this takes ninety seconds to read. It takes about ninety seconds to do, which is the point.
Should I throw water on a chimney fire?
No. Chimney fires burn at extreme heat, hot enough that pouring water on flue tile can crack it instantly from thermal shock. The sudden steam can also push burning creosote and hot gas back down into the room instead of up and out the top. It’s not a stubborn campfire, and dousing it the way you’d douse a burn pile makes things worse, not better.
What happens after the fire department leaves?
Don’t use that fireplace again until it’s been inspected. The heat from even a short chimney fire can warp a stainless liner or blow a hairline crack straight through clay flue tile, and neither failure shows up from the hearth with a flashlight. Loose mortar joints are just as easy to miss. Light another fire before checking, and you risk a repeat, or carbon monoxide finding its way into the house.
If the inspection finds the liner’s compromised, chimney relining by Americas Chimney Sweep is the fix, not a patch job on a liner that’s already failed once.
Do I need an inspection after a small or “quiet” chimney fire?
Yes. Some of the worst chimney fires never get loud enough to notice. They can burn slow behind the flue tile with no roar and no visible flame, and the only sign afterward is a crack you’d never see without a camera down the flue.
Field note: The chimney fires that do the real damage aren’t always the loud ones. I’ve opened up flues where the homeowner swore nothing happened all winter and found a section of flue tile cracked clean through, glassy black glaze fused on one side and bare mortar showing where a piece flaked off the other. Nobody heard it happen until it was already over. An inspection is the only way anyone finds out it happened at all.
Once a sweep and camera confirm the flue’s sound again, read up on NFPA chimney inspection levels so you know what a Level 1 covers versus a Level 2. If wood heat is part of your winter routine, check the no-burn calendar before you light a fire. Burning on a bad-air day means a cooler, smokier burn, and cooler, smokier burns are exactly what builds the glaze that starts these fires in the first place.
What causes a chimney fire?
Creosote. It’s the black or brown residue that condenses out of wood smoke and coats the inside of the flue, and it’s flammable. Enough of it built up, and a stray spark or a hot enough fire lights it off inside the chimney instead of the firebox.
Creosote builds up in stages, and how it looks tells you how far along it is. Early on it’s dry and flaky, and a brush clears it in minutes. Left long enough, it turns into a hard glaze, shiny and black, fused right to the tile, and a brush won’t touch it. At that stage the flue needs a professional to have the tar-like layer taken off the tiles before it becomes fuel for exactly the kind of fire this page is about.
Burning wet or unseasoned wood is the other big driver. It burns cooler and smokier than seasoned wood does, and cooler smokier burns are what lay down glaze fastest.
When is it not actually a chimney fire?
Most of what scares people isn’t a chimney fire. A loud pop from a pitchy log, a puff of smoke back into the room when you open the damper, a downdraft pushing smoke back in on a windy night, a shower of sparks off a fresh split log, or the glass fogging up are all things a normal wood fire does. None of that needs 911 or an emergency inspection.
The real tell is whether the sound and heat are coming from inside the chimney structure itself, not the firebox. If you didn’t hear a roar, didn’t see black smoke pouring from the top, and the exterior chimney wall isn’t hot, you probably watched a normal fire do normal things. Not a chimney fire.
Michael, the owner and only technician at Americas Chimney Sweep, checked this page before it went live. If you want to know more about the person who does this work, that’s him: no dispatcher, no rotating crew, just the person who shows up.
If what happened at your place matches the signs above, even a quiet one, it’s worth having someone look before you burn there again. Call (916) 833-2959 and ask for the $59 inspection. It’s deductible: go ahead with any repair the inspection turns up and that $59 comes off the total. Decide not to. Then $59 is what you owe, nothing more.
Michael answers the phone himself, 7 a.m. to 7 p.m., seven days a week, and covers five counties out from Nevada City. Americas Chimney Sweep is licensed under CSLB #1150991, C-29 Masonry.