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What is level 3 creosote?

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Troubleshooting Your Fireplace

There could be many reasons that your fireplace isn’t functioning correctly, and we want to help you solve the problem. Below is a list of potential issues and their respective solutions. Note that this list of problems/solutions is simplified, and a correct understanding of fireplaces requires an expert-level knowledge of airflow patterns.

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There are three levels of creosote:

Level 1: creosote is usually a light powder or soot and can easily be removed.

Level 2: creosote is often shiny and hard black flakes. This level of creosote is more difficult to remove.

Level 3: The most severe and challenging form of creosote is level 3. It is extremely thick and hardened. It is similar to tar. Level 3 creosote is extremely difficult to remove and poses a severe fire hazard.

Level 3 creosote is also called glazed creosote. It forms when creosote rapidly accumulates in the flue before the previous layers have dried. As it hardens, glazed creosote dries into a hard, dense substance that can damage the flue and chimney structure. Glazed creosote can be caused by burning unseasoned wood or by burning a fire at a low temperature for a long time.

What is most dangerous about glazed creosote is that it is highly flammable. A fire can easily cause the glazed creosote to ignite. This can lead to a fast burning chimney fire.

If you believe that there is glazed creosote in your flue, give Emberstone Chimney solutions a call!


I called this morning to schedule a cleaning when my stove started up so badly it wouldn't burn, expecting to see a technician next week some time, but when they found out that my wood stove was my primary source of heat, they said they'd be out in half an hour. My stove is running like new, and the two technicians made zero mess and were so friendly and polite. And to top it all off, they were great with my dogs and two-year-old son.
Jennifer C.
Prompt, thorough and efficient! Starting with the first email I received (within 30 minutes of my email request being sent) all the way to Chris the technician taking care of inspecting and cleaning - top notch guys! You run your business like ALL business's should be - Thank you!
Lori Birchard
I just received the best service from Emberstone Chimney Solutions! Chris serviced my chimney very quickly & was super professional. He took the time to take photos, and explain exactly what was going on! I would highly recommended to use this company for any chimney repairs!! Thank you so much for your help!

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