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What is the white discoloration outside of my chimney?

Chimney Sweep Charlotte NC Chimney Sweep Charlotte NC Chimney Sweep Charlotte NC

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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The white residue found on the exterior of your chimney is called efflorescence. It may look like the natural aging of a fireplace, but it is a sign of water leaking into your structure. If this situation is left unchecked, it could cause premature aging or deterioration of the chimney structure.

Efflorescence is caused when water moves through the chimney and evaporates, leaving behind a salt residue on the outside of the chimney. It then becomes a powdery substance on the outside of stone, block, or brick masonry. The salt deposits themselves aren’t necessarily a structural problem, but they are an indication that there is excess water present inside your chimney. If this problem is left alone, it could cause severe damage down the road.


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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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