How to Avoid Chimney Fires

 

According to the U.S. Fire Administration, an estimated 32,200 home heating fires were reported to fire departments within the United States. These fires caused an estimated 190 deaths, 625 injuries and $442 million in property loss.  Home heating fires account for 500 deaths per year.

There are over 25,000 chimney fires in the U.S. annually, and three out of 10 house fires (44,000) are related to heating appliances. For this reason alone, it is important to keep chimneys maintained, but performance problems can also arise that are not related to hostile fires.

Note: A "Friendly Fire" is one that is intended such as a fire in the fireplace or a candle burning. It becomes a "Hostile Fire" when it reaches beyond its intended location.

ALL OF THESE FIRES ARE PREVENTABLE

It is important to remember that ALL wood creates creosote, even hardwoods. The creosote must be removed by brushing with a special wire chimney brush for tile flue liners, or a poly brush for stainless steel flue liners or metal chimney pipe. The wrong type of brush can damage metal liners.

Chimneys should be swept when there is 1/8" or more of creosote on the flue walls. This is difficult to see, so another rule of thumb is to have the chimney swept annually for open fireplaces or at least twice seasonally for inserts or freestanding stoves.

How to prevent chimney fires

• Have the chimney swept regularly by a professional chimney sweep, who will also inspect the chimney to be sure it is in good working order.
• Use only dry wood (check with a moisture meter) that has been seasoned for a minimum of 6 months.
• Never burn dry Christmas trees, wrapping paper, or newspaper as these items often cause fires.
• The use of a "Chimney sweeping log" may result in a chimney fire since it detaches creosote from the flue walls and brings it closer to the fireplace, but does not remove the creosote.
• Use inserts and freestanding wood-burning stoves according to the manufacturer's instructions by leaving the door closed during burning, and regulating air intake so it does not overfire the stove. Overheating can ignite creosote in the pipe or flue without direct flame.

Most chimney fires are not detected by the homeowner

Chimney fire damage is usually detected by a chimney sweep during sweeping and inspection. Telltale signs are broken flue liners, blown out mortar joints, buckled metal liners or pipe, white hot spots, and burnt honeycomb creosote. There may also be expansion breaks in masonry. With this in mind, we estimate that there are 10 times the official reported totals!

While there are chimney fire signs to watch out for such as a loud wooshing or freight train sound and flames shooting out the top of the chimney, chimney fires are usually of short duration and not noticed while people are out of the room.

Damaged chimney flue liners can allow Carbon Monoxide, creosote, and smoke to escape into the area outside the liner and possibly into the house, making a damaged chimney a potential hazard. This is why it is so important to have regular inspections completed.

For more information visit www.chimkc.com

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Marge Padgit is a veteran chimney contractor, writer, and podcast host. Contact her at margepadgitt@gmail.com

How to avoid chimney fires

Chimney fires occur during cold weather months when people use their chimneys. A chimney fire occurs when accumulated creosote in a flue or smoke chamber ignites from a spark.

All wood creates creosote - even dry hardwoods- so it is imperative that flues serving fireplaces or wood-burning stoves, or fireplace inserts are swept regularly to remove this flammable substance. The NFPA recommends sweeping once per year for fireplaces, and at least twice during the season for heating appliances (wood stoves or inserts). A house fire can occur if the fire in the chimney escapes the flue liner or if burning embers fly out of the top of the chimney onto the roof. (Asphalt roofs can catch fire as well as wood shingle roofs). 

Most chimney fires are of short duration and go unnoticed by the homeowner - with damages usually found later during an inspection by a chimney sweep. 

 

Signs of a chimney fire:

•  Loud whooshing or roaring or freight train like sound
•  Flames shooting out the top of the chimney
•  Red glowing stove pipe
•  Backup of smoke into the house
• Sudden poor draft

It is a good idea to keep a chimney fire extinguisher near your fireplace or wood stove and use it if you notice a chimney fire, then get out of the house and call the fire department immediately. Fire can spread to nearby combustibles and cause a house fire. Be sure to keep an eye out for smoke smell or flames even after the fire department is gone because interior wood framing could smolder for hours afterwards and ignite if it gets enough oxygen. 

 

Blown out section of tile liner

After the fire: Call your local professional chimney sweep to have a thorough inspection and any needed repairs completed before using the appliance again. Most chimneys are severely damaged on the interior during a chimney fire and should not be used until inspected by a qualified professional. Any breaks or blown out sections in flue tiles or warped or buckled seams in steel liners or chimneys can be a fire and Carbon Monoxide hazard.

For more information about Carbon Monoxide, visit COHeadquarters.com.

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The Chimney Lady, Marge Padgitt, is a veteran chimney professional, trainer, and author. She is the co-owner of HearthMasters chimney and fireplace service in Kansas City, Missouri. Contact her at office@chimkc.com.

HearthMasters Publishing announces the release of Wood-fired Heating and Cooking

HearthMasters Publishing announces the release of Wood-fired Heating and Cooking: How to choose, maintain, and operate a wood-fired appliance

Kansas City, Missouri, November 4, 2021

Wood-Fired Heating & Cooking is a guide for homeowners, preppers, and homesteaders who are planning to install a wood-fired heating appliance, improve their existing masonry fireplace, or install a wood-fired cooking appliance. Industry veterans Gene and Marge Padgitt explain how each type of appliance works and how to properly locate, operate, and maintain them.

Heating appliances covered in this book are masonry fireplaces, Rumford fireplaces, circulating fireplaces, furnaces, wood-burning fireplace inserts, freestanding stoves, masonry heaters, and rocket mass heaters. Wood selection and preparation is included. Cooking appliances discussed are wood-burning indoor cook stoves, indoor and outdoor brick ovens and oven kits, Tandoori ovens, grills, and campfires along with cooking tools and utensils.

The authors provide references and suggested reading, online groups, and educational resources. A bonus section contains delicious recipes for cooking with a wood-fired appliance by the authors.

The release of Wood-Fired Heating and Cooking comes at a time when people are thinking about being self-sufficient and prepared for any disaster or power outage. The book is an excellent resource for persons who need help trying to navigate through all of the choices available to heat their home or cook with a wood-fired appliance.

Marge and Gene are available for radio interviews. 

Contact:

Marge Padgitt
hearthmasters.office@gmail.com
816-461-3665

How to Avoid a Chimney Fire that Can Lead to a House Fire

House fire caused by flammable
creosote and improper construction

Creosote is a flammable substance that must be removed from the flue and smoke chamber periodically in order to avoid having a chimney fire. 

Since all wood creates creosote, including dry hardwoods, creosote is impossible to avoid when burning wood in a fireplace, wood-burning stove, circulating fireplace, or stove insert.

Creosote can only be removed by brushing the flue and chamber out with wire or poly brushes that are made especially for this purpose. Professional chimney sweeps know what size and type of brush to use for the type of flue system installed. There are many different types of venting systems, so knowing how to properly maintain each type is critical.

In a masonry chimney with a wood-burning fireplace the most common type of flue system is made out of vitreous clay tile, and the smoke chamber is usually made out of brick, stone, or block. This type of venting system accumulates more creosote than a stainless steel flue liner does because it is more porous.

Stainless steel flue liners don't accumulate as much creosote if they are properly insulated and installed correctly, but can be damaged by a chimney fire so maintenance is necessary.

Smoke chambers that are not parge coated with insulating mortar per IRC Code requirements allow more creosote accumulation due to their rough surfaces and corbels which decrease the flow of smoke and tar vapours.

The National Fire Protection Association and the National Chimney Sweep Guild recommend that creosote be removed after 1/8" accumulation on flue walls.

Gene Padgitt Sweeping a masonry chimney

The creosote being removed should be stage 1 which is very light and ash-like, or stage 2 which is more dense. If there is any accumulation of stage 3 glazed baked-on tar-like creosote, something is not right with the system, the fuel being used, or the operation of the appliance. Stage 3 creosote is the most flammable type, and is most often associated with chimney fires.

A chimney fire occurs when a spark ignites the flammable creosote, usually in the smoke chamber just above the damper, and flame may spread through the remaining fuel source (creosote) on the flue walls.

Stage 3 Creosote on flue walls

Chimney fires can be of short or long duration, but almost always cause damage to the smoke chamber and flue liner due to the quick temperature differential that occurs to the masonry during a chimney fire. Damages may occur to the face wall above the fireplace opening inside the house, to the back wall of the chimney, or to the top portion of the chimney and cement cap due to expansion. Fresh breaks may be found in the masonry and cement cap in a masonry chimney.

Burnt creosote that has been on fire

In a manufactured fireplace and metal chimney damages may occur to the metal smoke chamber and metal chimney pipe in the form of buckling, warping, and opening of seams. With a Class A chimney system serving a wood-burning stove, the same type of damage can occur.

In either case, the damage must be repaired, or parts replaced before further use because the system is no longer functional if it has damages.

Unfortunately, most chimney fire damage is found only during inspection of the system during routine chimney cleaning/inspection maintenance by a professional chimney sweep. Most chimney fires go unnoticed by homeowners when the fire occurs because they either don't recognize the whoosh of air and increased draft during a chimney fire, or are out of the room when it occurs and the fires goes out before they return.

Burnt, honeycomb creosote that has
been burned in a chimney fire

After a fire has damaged a chimney system, the flue liner and chamber may have cracks and gaps that would allow a second fire to escape to nearby combustible wood framing. This is how a house fire due to chimney fire commonly occurs. Another way a house fire can occur is if flame and sparks shooting out the top of the chimney catch the roof on fire.

chimney inspection with a Chim-Scan Camera

Water damage from rain and condensing acidic flue gasses often causes mortar joints between tile liner sections to deteriorate and leave gaps, which may also allow heat and flame to escape the flue system and cause a house fire.

The only way to know if the flue system has damages is to sweep it first to remove creosote, then run a special chimney camera through the chamber and flue. Photos may be taken with this type of camera. If damages are found, do not use the appliance until it is properly repaired by a professional chimney contractor.
 

Break in clay tile flue liner

In the greater Kansas City area, call HearthMasters, Inc. for chimney maintenance, repair, and building.  

www.chimkc.com

816-461-3665