How to Spot Creosote Buildup (and When It’s Time to Call a Chimney Sweep)
If you use your fireplace regularly, one of the biggest safety risks you need to watch out for is creosote buildup. Creosote is a dark, tar-like substance that forms inside your chimney when wood doesn’t burn completely. Over time, it can harden, restrict airflow, and even cause dangerous chimney fires. Here’s how to recognize the warning signs.
Signs of Creosote Buildup
Black, flaky soot around the fireplace or chimney walls.
Shiny, tar-like coatingon the inside of the flue.
Strong, smoky odoreven when the fireplace isn’t in use.
Reduced airflowor smoke backing up into the room.
Difficulty starting or maintaining a firebecause of restricted draft.
Why Creosote is Dangerous
Creosote is highly flammable. If enough of it accumulates, it can ignite inside your chimney, leading to fast-spreading fires that threaten your entire home.
When to Call a Chimney Sweep
If you spot any shiny or glazed creosote, it’s beyond DIY cleaning and needs professional removal.
If it’s beenover a year since your last inspection, it’s time to schedule one.
If you burn wood often—especially softwoods that produce more creosote—call a sweepevery 6 months.
The Bottom Line
Regular inspections and cleanings are the best way to prevent chimney fires and keep your fireplace running efficiently. If you notice signs of creosote buildup, don’t wait—call a certified chimney sweepto handle it safely.
