Preventing Creosote Buildup With Borax

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Creosote buildup in chimneys is dangerous and can lead to chimney fires. One effective way to prevent creosote buildup is by using borax. Borax is a natural mineral that can help break down creosote and prevent it from sticking to the chimney walls. To use borax, simply sprinkle it on the firewood before burning. The heat from the fire will activate the borax and help remove the creosote. Regularly using borax can significantly reduce creosote buildup and keep your chimney safe. However, it is important to note that borax should not be used in gas fireplaces.


After burning wood or artificial logs, creosote buildup occurs in chimneys. It contains chemical byproducts that become airborne when wood burns and then solidify on the chimney walls as it cools. Creosote is highly flammable, and if ignited inside the chimney, it can cause a fire that spreads through the house. Regular creosote removal is crucial to prevent chimney fires.

However, not all creosote buildup is the same. If you want to use a creosote remover on your own, you need to do it regularly. Older creosote requires professional equipment and careful removal, which is best left to the experts.

Different Types of Creosote

It is important to note that there are three types of creosote, known as “stages” or “degrees,” according to Chimney Solutions. Do-it-yourself creosote remover is effective only for stage one creosote, which is “young” creosote that hasn’t been on the chimney walls for long and can be easily jostled off.

Stage two creosote has a shiny appearance and a higher tar content. It is solid and difficult to remove without the right equipment and training.

If you see tar dripping from your chimney, you are dealing with stage three creosote, which has a large volume and puts your chimney at a high risk of fire due to the amount of flammable material. Stage three creosote can be somewhat easy to remove because of its spongy texture, but it is still best to let professionals handle it to ensure thorough cleaning of the chimney.

Using Borax to Prevent Creosote Buildup

An effective DIY method to prevent creosote buildup is to add a mixture of borax and salt to your fire every two weeks. This helps to remove early stages of creosote and make it flake off into the fire. Simply mix 4 cups of borax with 1 cup of salt (regular table salt works fine).

Build a hot fire and let it burn for about 10 minutes. Then, add another log and let the temperature cool slightly. Carefully sprinkle the borax and salt mixture over the logs, covering as much of the burn area as possible. Let the fire continue to burn as usual.

Alternatively, you can purchase a creosote log to burn in your fireplace or wood stove to clear creosote from the chimney. If you use your fireplace or wood-burning stove daily, try burning a hot fire twice a day to send hot air through the chimney and prevent creosote buildup. Whichever method you choose, it is recommended to start only after having your chimney professionally cleaned to ensure you are not dealing with stage two or stage three creosote.

Tips to Prevent Creosote Buildup

You can also reduce the risk of a chimney fire by striving for a “clean burn” whenever possible. This means burning only well-seasoned wood and ensuring the fire receives adequate airflow. Additionally, since creosote solidifies in cooler air, you can prevent buildup by keeping the chimney as warm as possible. This involves warming the flue before starting a fire and ensuring proper insulation of the chimney.

If you have any inquiries or worries about the potential dangers of cleaning chimneys, it is highly recommended to contact a professional chimney sweep for expert advice and thorough cleaning services.

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