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Soot or black staining

New or unexplained black staining around a fireplace should be assessed before reuse. Treat an alarm, illness, or active smoke as an emergency.

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Updated September 10, 2026Homeowner guidance
Aged gas log set with soot deposits in a metal firebox
CHIMNEY / FIREPLACE / HOMEUSA CHIMNEY PROS
STOP USE

What to do first

Stop using the affected fireplace until it has been assessed. For suspected gas, a CO alarm, an active fire, or immediate danger, leave and call 911 from a safe location.

This form does not dispatch emergency help.

A technician checking the smoke chamber of a cast-iron wood stove on a stone hearth pad by flashlight, the fireplace cold; illustrative image
Illustrative service image — not a documented company job
01 / A CLOSER LOOK

Document where the stain begins

Photograph the overall fireplace opening and the location of the mark, then stop using the appliance pending advice. Tell the evaluator whether the mark is new or has returned after cleaning. A proposal should address the reason for staining before including cosmetic cleaning or repainting.

A bright hearth room with an open masonry wood-burning fireplace and a clean stone surround; illustrative image
Illustrative service image — not a documented company job
02 / THE HOMEOWNER PERSPECTIVE

What the inspection should resolve

Ask for the cause, supporting photographs, limitations of the inspection, and a written recommendation about continued use. A repair quote should identify the affected parts and the reason for the proposed work.

THE SHORT ANSWER

New or unexplained black staining around a fireplace should be assessed before reuse. Treat an alarm, illness, or active smoke as an emergency.

Updated September 10, 2026

What you can observe safely

  • Photograph the staining while the system is cold and from a safe distance.

What to avoid

  • Do not climb onto the roof or enter the chimney.
  • Do not alter gas components, venting, or safety controls.
  • Do not use a test fire to diagnose the problem.

Possible causes to assess

  • Combustion deposits
  • Smoke escaping the expected path
  • Appliance or venting concern

A symptom cannot establish the cause remotely. An assessment of the complete system helps determine the appropriate repair.

Chimney inspection

A few common questions

Can this be diagnosed from a photo?

A photo can document a symptom and help prepare a visit. It cannot confirm concealed conditions or establish that a chimney or fuel-burning appliance is safe.

Sources & further reading

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