What Does Creosote Smell Like?

What creosote actually smells like

Creosote is the dark, tar-like residue that wood smoke leaves behind as it cools inside the flue. People describe the smell different ways, and all of them point to the same thing:

• Smoky or like a campfire/barbecue, even when no fire is burning.
• Acrid and burnt, a sharp, throat-catching edge.
• Tar or asphalt-like when the buildup is heavy and glazed.
• Musty or sour when the chimney has taken on moisture.

If that odor drifts into the room from a fireplace you are not even using, it is coming from creosote deposits coating the inside of the flue.

Why does my chimney smell worse in summer?

It is one of the most common questions we get, and the answer is not the weather itself. Humidity makes creosote give off more odor, so deposits that were quiet all winter suddenly become noticeable. On top of that, a tightly sealed, air-conditioned house can pull air down the chimney instead of letting it rise, a downdraft that carries the creosote smell straight into your living space. The smell is the buildup; the summer conditions just make it obvious.

Is the creosote smell dangerous?

The odor on its own is mostly a nuisance, but it is a genuine warning sign. Creosote is highly flammable and is the leading cause of chimney fires. The Chimney Safety Institute of America (CSIA) and NFPA 211 recommend sweeping once buildup reaches about one-eighth of an inch. The most dangerous form is glazed, Stage 3 creosote, a hard, shiny, tar-like layer that is difficult to remove and burns hot. If you can smell creosote, there is enough of it in there to justify a look.

How do I get rid of the creosote smell for good?

The only permanent fix is removing the source. A professional sweep takes out the creosote that is causing the odor; deodorizers, baking soda and a tidy firebox only mask it for a while. If the smell is being driven into the house by a downdraft, a top-sealing damper and addressing household air pressure usually solve it. A CSIA-certified inspection will tell you which it is.

• A professional chimney sweep removes the creosote itself.
• A camera-scanned inspection shows how much buildup there is and what stage.
• A top-sealing damper and make-up air fix downdraft-driven odor.

When should you call a chimney sweep?

Call if you notice a persistent smoky or tar-like odor, see black or shiny buildup in the firebox or flue, or it has simply been more than a year since your last cleaning. Annual inspection is recommended whether you burn a lot or a little. You can see typical pricing on our chimney cost guide, or reach Warrington Chimney & Fireplace directly at (215) 385-3214 for a free estimate.