Chimney Fire Signs: What to Do Before You Use the Fireplace Again

A chimney fire can be obvious, but it can also happen without the homeowner realizing it. That is what makes suspected chimney-fire damage different from an ordinary cleaning appointment.

If you believe a fire occurred in the flue, the right question is not “Did the fire go out?” It is “Did the heat damage the system that is supposed to contain future fires and combustion gases?”

Common signs during a chimney fire

The Chimney Safety Institute of America describes several signs people may notice during a more dramatic event:

• Loud cracking or popping noises
• Dense smoke
• A strong, unusually hot smell
• A low rumbling or roaring sound
• Flames or heavy smoke visible from the chimney top

If an active chimney fire is suspected, treat it as a fire emergency and call 911.

Some chimney fires are quiet

Not every event looks like a movie scene. A slow-burning chimney fire may not have enough air or fuel to create dramatic flames, yet it can still expose the flue to damaging heat.

That means homeowners sometimes discover evidence only later during an inspection.

What damage can occur?

High temperatures can affect different systems in different ways.

In masonry chimneys, thermal stress can crack clay flue tiles or damage mortar joints. In factory-built metal systems, overheating can lead to warping, buckling, joint separation or other damage.

Exterior signs can sometimes include cracked masonry, discolored caps, pieces of creosote on the roof or ground, or damaged materials near the chimney.

The absence of an obvious exterior crack does not prove the flue is undamaged.

Do not simply sweep it and light another fire

Cleaning combustible deposits may be part of the process, but after a suspected chimney fire the system also needs to be evaluated for damage.

CSIA guidance on post-fire evaluation discusses internal video inspection as a way to examine flue tiles, mortar joints and metal chimney components after deposits have been removed enough to see the surfaces.

The key is to confirm the system can safely contain and vent the next fire before returning it to service.

What should the homeowner document?

If damage may involve an insurance claim, photographs and written documentation can be valuable. Document visible damage before repairs begin when possible, and keep copies of inspection findings and repair recommendations.

Coverage varies by policy and situation, so homeowners should contact their insurer directly rather than assuming every chimney event will be handled the same way.

Why creosote is so important

Creosote is combustible. It can accumulate when wood combustion produces smoke that condenses on cooler chimney surfaces. Wet wood, restricted airflow and long smoldering fires can contribute to heavier deposit formation.

Prevention is therefore not only about sweeping. It is also about how the fireplace or stove is operated.

Burn dry wood, maintain the airflow required by the appliance, avoid burning trash or treated materials, and have the system inspected regularly.

What to do after the fire department leaves

The fire department’s job is to control and extinguish the fire. A chimney professional’s job is different: evaluate the venting system and determine whether heat damage occurred.

Before reuse:

1. Keep the fireplace or stove out of service.
2. Schedule a professional evaluation.
3. Remove deposits as needed so the flue can be inspected.
4. Use camera inspection when appropriate.
5. Repair damaged components before another fire.

Colorado considerations

A chimney that has already experienced thermal damage may then face months of moisture, snow and freeze-thaw cycles. Cracks can also become pathways for water.

That is another reason not to leave a post-fire chimney “for later” if the home will continue to be exposed through a Colorado winter.

If you suspect a chimney fire, do not use the system until it has been evaluated. Keaton Chimney Solutions serves Denver, Colorado Springs, Fort Collins and surrounding communities. Call 720-734-5373.

Need help with a chimney or fireplace in Colorado? Keaton Chimney Solutions serves Denver, Colorado Springs, Fort Collins, and surrounding communities. Call 720-734-5373.