What Is Creosote Buildup and Why Is It Dangerous
If you have a fireplace in your home, you may have heard of creosote buildup, but do you know it can pose a significant risk of chimney fire? Creosote buildup is common in wood-burning fireplaces and must be addressed. Not only does hazardous creosote buildup pose a significant risk of chimney fires when unchecked, but it is also a toxic substance that can be difficult to remove if left unaddressed.
The good news is that dangerous chimney creosote buildup can be prevented and easily remedied with regular chimney cleaning. Learn more about creosote buildup, what it is, and how you can address it in your home, allowing you to safely enjoy your fireplace guilt-free and worry-free.
What Is Creosote?
Creosote is a naturally occurring byproduct that forms when wood is burned, whether in a fireplace, a stove, or outdoors. It’s a sticky, tar-like substance that can, over time, after burning wood fires, coat your chimney flue and present a dangerous chimney fire hazard.
When wood, including its moisture and sap, burns, the combustion of those components produces gases. We see and smell the gases in smoke from a fire, which can often have a pleasant aroma. However, as that smoke cools, it condenses into a liquid that is known as creosote.
Wood creosote, also known as chimney creosote, is considered toxic because it has been linked to cancer in individuals with repeated exposure (such as chimney cleaners who do not wear proper protective equipment), but it is a different type of creosote from toxic coal-tar creosote.
Although creosote is unavoidable, homeowners with chimneys can easily address it with regular chimney cleaning. However, because creosote buildup is mostly in your chimney flue, it is a hazard that is out of sight, out of mind, which is where the danger comes into play.
How Creosote Buildup Occurs
With regular chimney cleaning, creosote buildup is manageable, but it’s important to understand how it forms. This understanding may prompt you to adjust how you burn fires in your fireplace or wood-burning stove, or at least indicate you need more frequent chimney cleanings.
For those with more frequent burning habits, creosote can build up faster simply because there are more opportunities for it to form. Additionally, large, roaring fires exacerbate conditions that promote creosote formation.
Certain types of wood, such as softwoods, are more prone to creosote formation, and improperly seasoned wood will also produce more creosote in your chimney. Improperly or unseasoned wood means that it has a lot of moisture in it, whether it’s from a tree that has been recently chopped down or has been stored in an area exposed to wet conditions.
As an aside, homeowners should never burn paper (such as junk mail), cardboard, or other man-made wood products in their homes, as they often contain contaminants and can cause a fire that burns too hot, which can damage the flue.
Three Stages of Creosote Buildup
Chimney experts typically rate creosote buildup in three stages based on severity.
Creosote starts off as a powdery, flaky soot that is easy to wipe away. This is the type that is an easy chimney clean and doesn’t require much extra effort than having your favorite, certified chimney sweep come out and brush out the soot.
As creosote builds up, it can become sticky and tar-like. Each new fire adds a layer of creosote to what’s already there. This stage of creosote buildup is problematic and increases the danger of a chimney fire, but it can be addressed with more advanced cleaning methods.
The third and most dangerous type of chimney creosote buildup is so thick it becomes hard with multiple layers of sticky soot that have hardened on top of one another, heated by a new fire, with more creosote added. This third type of creosote buildup is highly flammable and creates a major chimney fire hazard in your home. It is imperative that this be addressed by a certified, qualified chimney sweep professional, ideally certified by the National Chimney Sweep Guild or the Chimney Safety Institute of America.
Signs of Creosote Buildup
While scheduling regular inspections and cleanings, along with practicing safe burning habits, can minimize creosote buildup, it’s important to be aware of signs of big-time creosote buildup. Sometimes wood absorbs more creosote than other materials, which can build up before your next regularly scheduled cleaning.
You can stay on top of creosote buildup by staying informed. Pay attention to strong odors emanating from your fireplace; it is a sign that you have a lot of creosote buildup. Additionally, if you’re experiencing poor drafting conditions, creosote buildup may be to blame.
More serious signs of a creosote problem occur when you can visibly see creosote buildup. Even more dangerous is smoke backing into your home during a fire, as it indicates a major hazard. If that happens, immediately extinguish the fire and do not burn again until your chimney has been inspected and cleaned. And of course, if the fire gets out of control, call 9-1-1.
Protect Your Home From Dangerous Creosote Buildup
Whether you’ve just purchased a home with a chimney or it’s been a while since you’ve had your chimney inspected, it’s worth having a professional take a look at your fireplace and chimney flue to check the condition of your chimney. Dangerous creosote can be prevented with regular chimney inspections and cleanings, and safe burning practices can help minimize the amount of creosote created with each fire.
Creosote buildup is nothing to mess with, as it creates a chimney fire hazard that can harm your family. No one ever wants to face a fire in their home. If you’re located in western Chicagoland, contact Valley Chimney Sweep and Restoration today for an inspection and cleaning to protect your family!
Frequently Asked Questions
Q: What causes creosote buildup in chimneys?
A: Creosote forms from wood smoke as it cools and condenses inside the chimney flue. Burning unseasoned wood, poor airflow, and infrequent cleaning all increase buildup.
Q: How can I tell if I have creosote in my chimney?
A: Look for strong odors, poor drafting, black flaky residue, or visible smoke entering your home. These are signs that you need an inspection.
Q: Is creosote dangerous to breathe?
A: Yes. Prolonged exposure to wood creosote particles is considered toxic and has been linked to respiratory and other health issues.
Q: How often should I clean my chimney to remove creosote?
A: Once a year at minimum, or more frequently if you burn wood often or use softwood or green wood.
