7 Warning Signs Your Chimney Needs Cleaning

A dirty chimney isn't just an inconvenience—it's a serious safety hazard. Creosote buildup is the leading cause of chimney fires, and blocked flues can cause deadly carbon monoxide poisoning. Here are the warning signs every homeowner should know.

1. Black Soot Buildup

If you see black, flaky soot accumulating in your firebox or falling from the damper, it's time for a cleaning. This is Stage 1 creosote and is relatively easy to remove—but ignoring it leads to more dangerous buildup.

2. Fires Are Hard to Start

Struggling to get a fire going or keep it burning? Poor draft caused by creosote buildup or blockages prevents proper airflow. Your chimney needs inspection.

3. Smoke Enters the Room

Smoke should go up the chimney, not into your living space. If smoke is backing up into the room, you likely have a blockage or draft problem that needs immediate attention.

4. Strong Odors

A strong, unpleasant smell coming from your fireplace—especially in summer when humidity is high—indicates creosote buildup. The smell gets worse with moisture and heat.

5. Visible Creosote (Tar-Like Substance)

If you see shiny, tar-like deposits in your chimney, you have Stage 3 creosote. This is extremely dangerous and highly flammable. Stop using your fireplace immediately and call a professional.

6. Animals or Debris

Birds, squirrels, and other animals love to nest in chimneys. If you hear scratching, see debris falling, or notice a foul smell, you may have an animal problem that requires professional removal.

7. It's Been Over a Year

The National Fire Protection Association recommends annual chimney inspections. If you can't remember your last cleaning, it's overdue. Even light use accumulates creosote over time.