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Why does my fireplace smell — especially in summer or after rain?

A campfire smell usually means creosote in the flue, and it gets stronger in humid weather and when the house pulls air down the chimney. A musty smell points to moisture — a leak, a missing cap, or debris and nesting in the flue. A rotten-egg or gas smell is different: leave the house and call Enbridge Gas or 911 from outside.

Chimney Sweep — GTA price$249 – $549plus HST · details
Wood fire burning in a stone fireplace

Toronto Chimney Repair · October 4, 2026

Smoke or campfire smell

Creosote is the tar-like residue that every wood fire leaves in the flue. In humid summer weather it gives off a stale smoke smell, and in tight modern houses, kitchen and bathroom fans can pull air down the chimney and into the room. A sweep removes most of the creosote, and closing the damper and glass doors when the fireplace isn't in use stops the down-draft. Our sweep is $249 to $549 plus HST depending on the build-up, priced before we start.

Musty or damp smell

A musty smell means water is getting in: through an open flue, a cracked crown or failing flashing. It can also come from leaves, a bird or squirrel nest, or a dead animal on the smoke shelf. A cap, a crown repair or a clean-out fixes it, depending on what the inspection finds.

Gas smell

If a gas fireplace or a nearby appliance smells like rotten eggs, don't touch light switches. Get everyone out, then call Enbridge Gas or 911 from outside. Book a repair only after the gas company has made it safe.

FAQ

More answers

Will a cap stop the smell?

It stops rain and debris getting in, which fixes musty smells. Creosote smells need a sweep.

Is a smoky smell dangerous?

The smell itself isn't, but heavy creosote is what starts chimney fires. Have it swept before the next fire.

Book online

Book a visit in a 3-hour window.

Pick a day and 8–11, 11–2 or 2–5. We call to confirm, and the technician calls again about 30 minutes before arriving.

Two people sitting by a wood fire in the evening

Closed Saturdays. Or call (289) 819-4700

Call (289) 819-4700