How to Maintain a Masonry Chimney and Keep it Functional for Years to Come

Maintaining a masonry chimney is essential for ensuring its longevity and functionality. A well-maintained chimney not only enhances the aesthetic appeal of your home but also plays a crucial role in the safety and efficiency of your heating system. This comprehensive guide will walk you through the various aspects of chimney maintenance, from identifying signs of damage to performing regular inspections and repairs.

Understanding the Importance of Chimney Maintenance

Chimneys are exposed to various environmental factors, including rain, snow, and extreme temperatures, which can lead to deterioration over time. Regular maintenance is vital for preventing costly repairs and ensuring the safety of your home. Here are some key reasons why chimney maintenance should be a priority:

Safety Concerns

A poorly maintained chimney can pose serious safety hazards, including the risk of chimney fires and carbon monoxide poisoning. Creosote buildup, a byproduct of burning wood, can ignite and cause a fire within the chimney. Regular cleaning and inspections can help mitigate these risks.

Structural Integrity

Over time, moisture can seep into the masonry, leading to cracks and deterioration. If left unaddressed, these issues can compromise the structural integrity of the chimney, potentially leading to costly repairs or even collapse.

Efficiency

A well-maintained chimney ensures proper ventilation for your fireplace or heating system. Blockages or damage can hinder airflow, reducing the efficiency of your heating system and increasing energy costs.

Signs of Damage to Look For

Being proactive in identifying signs of damage can save you from more extensive repairs down the line. Here are some common indicators that your chimney may need attention:

Cracks and Gaps

Inspect the exterior of your chimney for visible cracks or gaps in the bricks or mortar joints. These can develop due to thermal expansion, settling of the foundation, or freeze-thaw cycles. Addressing these issues promptly can prevent further damage.

Spalling Bricks

Spalling occurs when the surface of the bricks begins to flake or chip away, exposing the inner layers. This can be caused by moisture infiltration, rain, and freeze-thaw cycles. Spalling not only affects the appearance of your chimney but also compromises its structural integrity. If you see spalling bricks, have them replaced. If a large area of the chimney is spalling it may need to be rebuilt. Soft bricks are more susceptible to moisture penetration than hard bricks, but unfortunately, builders use soft bricks in many cases because they are less expensive. 

Effleorescence

Efflorescence

Efflorescence appears as white stains on the chimney surface, caused by the migration of salts to the surface due to moisture evaporation. While not harmful in itself, it can indicate underlying moisture issues in the interior that need to be addressed. In most cases, efflorescense is seen on the utility flue side where the water heater, furnace, or boiler are located. Inspection of the interior flues in the chimney are critical to check for washed out mortar joints, gaps, or even missing flue tiles, and properly sized flue liners. 

Water Stains

Look for water stains on the ceiling or walls near the chimney. These can indicate leaks caused by damaged flashing or deteriorated chimney crowns. If left unchecked, water intrusion can lead to mold growth and wood rot. The chimney should be inspected by a professional, who knows how to do leak checks and find the source(s) of the problem. 

Smoke and Odors

If you notice smoke or unpleasant odors entering your home when using the fireplace, it may indicate blockages or airflow problems. Common causes include creosote buildup or debris obstructing the flue.

Regular Inspections: A Key Component of Maintenance

Conducting regular inspections is crucial for identifying potential issues before they escalate. Here’s how to approach chimney inspections:

Frequency of Inspections

It is recommended to have your chimney inspected at least once a year by a qualified professional chimney sweep. This ensures that any signs of damage or deterioration are caught early.

What to Expect During an Inspection

During a professional inspection, the technician will assess the condition of the chimney structure, check for signs of damage, and recommend necessary repairs or maintenance. They will also inspect the flue for blockages, make sure the damper is functioning correctly, check for proper sizing of the flue liner, inspect the smoke chamber, ensure that the chimney cap is in good condition and more. A pro will use a chimney camera system to inspect the interior of the chimney and provide a written report with photos. 

Cleaning Your Chimney

Regular cleaning is essential for maintaining the safety and efficiency of your chimney. Here’s how to approach chimney cleaning:

When to Clean

Schedule a professional chimney cleaning at least once a year, or more frequently if you use your fireplace or wood-burning insert regularly. If you notice a buildup of soot or creosote, it’s time for a cleaning.

DIY Cleaning Tips

If you choose to clean your chimney yourself, ensure that you have the proper tools, including a properly sized chimney brush, a vacuum, tarps, and protective gear. Start by removing the fireplace grate and any ashes, then use the brush to scrub the flue from top to bottom. Note: we do not recommend doing this job yourself unless a pro is not available. 

Waterproofing Your Chimney

Applying a waterproof treatment can help protect your chimney from moisture damage. Here’s what you need to know:

Benefits of Waterproofing

Waterproofing helps prevent water absorption, which can lead to brick deterioration and weakening or deterioration of mortar. It is recommended to reapply the sealant every 2-5 years or when water no longer beads up. Professional chimney sweeps have access to professional-grade water repellent that is not available to the public.

Installing a Chimney Cover

A chimney cap serves as a protective barrier against rain, snow, debris, and animals entering your chimney. Here’s why it’s important:

Benefits of a Chimney Cover

A properly installed chimney cap helps prevent moisture damage and reduces the risk of chimney fires caused by debris buildup. It also keeps birds and animals from entering your chimney and making flammable nests or blockages.

Maintenance of the Chimney Cover

Regularly inspect the chimney cap to ensure it is securely in place and free of debris. If you notice any damage, consider replacing it promptly.

Monitoring for Damage

Being vigilant about monitoring your chimney can help catch issues early. Here are some tips:

Visual Inspections

Conduct monthly visual inspections of your chimney and fireplace. Look for loose bricks, cracks, or signs of water damage. If you notice any issues, contact a professional for further assessment.

Seasonal Maintenance

Perform seasonal maintenance checks, especially before and after the burning season. In the spring, inspect and clean your chimney to remove smelly creosote and assure it is ready for fall. Also check for any damage that may have occurred during the winter.

Safe Burning Practices

Practicing safe burning techniques can help minimize creosote buildup and protect your chimney. Here’s how:

Use Seasoned Wood

Always use seasoned hardwoods in your fireplace or wood-burning stove. These woods produce less creosote compared to unseasoned or softwoods, however, all wood creates creosote that must be removed at some point. Do not burn hedge or dry pine because these woods burn very hot and fast and can lead to a chimney fire. Check moisture content with a moisture meter and make sure it is at or under 20%. 

Avoid Burning Trash

Never burn trash, cardboard, wrapping paper, railroad ties, or other materials that can release harmful chemicals and contribute to chimney damage. Stick to burning only dry, seasoned wood.

Scheduling Professional Repairs

If you notice significant damage or structural issues with your chimney, it’s essential to contact a certified chimney professional for repairs. Here’s what to consider:

Choosing a Professional

Look for a chimney service provider with experience and positive reviews. Ensure they are certified and knowledgeable about masonry repairs.

Importance of Timely Repairs

Addressing chimney issues promptly can prevent further damage and ensure the safety and efficiency of your heating system. Don’t wait until minor problems escalate into major headaches.

Conclusion

Maintaining a masonry chimney is crucial for ensuring its longevity, safety, and efficiency. By conducting regular inspections, cleaning, and addressing any signs of damage promptly, you can keep your chimney functional for years to come. Remember, when in doubt, consult a professional to ensure that your chimney remains a safe and reliable part of your home.

By following these guidelines, you can enjoy the warmth and ambiance of your fireplace with confidence, knowing that your chimney is well-maintained and safe for use.

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Marge Padgitt is the co-owner of HearthMasters and HearthMasters Publishing. She was a Certified Chimney Sweep from 1990-2004, and an NFI Certified Woodburning Specialist from 2003-2024, when she semi-retired from contracting. Marge is the author of Wood-Fired Heating and Cooking, Your House is Killing You, and The Chimney and Hearth Pro's Resource Book. www.chimkc.com 

2,000 Year Old Painting of a Pizza Proves the Italians Created This Dish!

According to the BBC,  The recently-discovered fresco emerged on a partially-destroyed wall within a Pompeii residence's corridor.

Researchers exploring the preserved Roman city of Pompeii have discovered an artwork that potentially shows an early version of what would become Italy's famous pizza.

Photo: Italian Ministry of Culture

The circular bread shown in the ancient fresco "could represent an early predecessor of today's popular dish," according to Italian heritage officials. However, it lacks the traditional toppings required to classify it as a true pizza.

The artwork was discovered in a residence's entrance hall adjacent to a bakery during current excavations at the southern Italian site. The find occurred this year during ongoing exploration of Regio IX, one of nine sectors comprising the historic settlement.

The structure had undergone partial excavation during the 1800s before work resumed in January this year—approximately two millennia after the volcanic disaster that consumed the city.

Experts at the Unesco-listed archaeological park indicate the newly-revealed fresco showing the bread, depicted alongside a chalice of wine, suggests it may have been consumed with fruits like pomegranates or dates, or enhanced with herbs and a primitive pesto preparation.

Site director Gabriel Zuchtriegel noted the artwork's portrayal of the contrast between "modest, basic fare" and "ornate silver platters." "It's impossible not to draw parallels with pizza, which similarly originated as humble fare in Italy's south before achieving global popularity and earning a place in fine dining establishments," he remarked.

Additionally, researchers recently discovered three human remains near the kitchen area's furnace within the building's service section, officials reported.

The Vesuvius volcanic catastrophe in AD 79 preserved Pompeii under volcanic debris, effectively freezing the city and its inhabitants in time. Since its 16th-century discovery, the location has provided invaluable archaeological insights.

The archaeological park lies approximately 23 km (14 miles) from Naples—the contemporary birthplace of the Unesco-recognized Italian pizza.

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Margie Padgitt is a 40-year veteran chimney business owner, author, and filmmaker living in Kansas City, Missouri. Contact: margepadgitt@gmail.com 

 

Safety Tips for Fireplaces and the Holidays

 Tip #1: Inspections. Some people use their fireplaces year-round and others only build a fire during the holidays - but it is important to have the chimney inspected and cleaned if necessary no matter how much the fireplace is used. This is because things can happen during the year to make fire hazards such as birds or squirrels building flammable nests, masonry deterioration, unseen blockages, etc.

Tip #2: Stockings. In the photo above we see just two stockings hanging above the fireplace, but they are still too close to the fire. Stockings are a fire hazard, so please remove them before building a fire in the fireplace. Also keep all flammable items at least 36" away from the fireplace opening, whether it is wood or gas burning.

Tip #3: Don't Burn Dry Christmas Trees. If you're using a real tree this year, it will dry out by the time January 1 rolls around. Dry pine is the most flammable type of wood but a Christmas tree is the most dangerous. Check YouTube to see some crazy people put their trees into their fireplaces and see them start chimney fires and watch flames shooting out the top of the chimney. Not a good idea. Instead, cut the tree into very small pieces and use them for fire starter throughout the winter.

Tip #4: Don't Burn Wrapping Paper. Keep the pretty wrapping paper out of the fireplace because when it burns it releases toxic fumes. Any paper that has color on it will produce toxins, and that includes magazines, brochures, flyers, etc. As a rule of thumb, only burn cordwood in a fireplace. If you have gas logs, don't put anything in the fireplace.

Have a Safe and Happy Holiday Season!

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

Squirrels and Racoons are Chimney Hazards!

 

Squirrels and racoons use chimneys to build nests for their young. Mama racoons are especially aggressive if their young are approached and may bite. Unfortunately, racoons carry rabies and if bitten a person would need to have rabies treatment. Both squirrels and racoons carry diseases as well.

Squirrels have been known to build extremely large nests inside chimneys, causing a blockage and also a fire hazard. In one case, we encountered a 20'-foot tall, hard packed squirrel nest from a 30' tall chimney which took all day to remove. Besides being a fire hazard, nests block the flow of flue gasses which need to exit through the chimney.

It is best to avoid intrusion by these animals with the use of a heavy-duty stainless-steel chimney cover from a professional chimney sweep, which is much more difficult to destroy than a standard chimney cover that is available at hardware stores or box stores. The standard black steel covers also rust, causing unsightly stains on masonry that can't be removed.

However, if a racoon or squirrel family has set up home in your chimney, call a professional animal removal expert to have them removed prior to installing a cover.

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Marge Padgitt is the author of Wood-Fired Heating and Cooking and the host of The Hearth and Home Show on the HearthMasters YouTube Channel. Reach her at www.chimkc.com.

Chimney Swifts are Coming!

 

Chimney Swifts, those agile aviators of the sky, have intriguing nesting habits. The love to build flammable nests inside chimneys, along with other bird species.

• Chimney Swifts overwinter in the Amazon Basin in South America and return to nest across the eastern half of the USA each spring, and that includes the Midwest.
• These birds prefer dark and sheltered sites with vertical walls. While chimneys are their favored nesting spots, they also nest in: Natural sites: Hollow trees and tree cavities.
• Nest sites: Chimneys, wells, abandoned buildings, barns, silos, and outbuildings.
• Nesting Period: Chimney Swifts begin nesting in the spring or summer.
• The entire nesting process typically takes about two and a half months.
• These skilled architects weave their nests from small twigs, securing them to vertical surfaces using their glue-like saliva.
• Incubation lasts from 16 to 21 days, and the young fledge between 14 and 19 days after hatching.
• Overall, the nesting time frame for chimney swifts spans 30 to 40 days.
• Chimney Swifts have been nesting in chimneys for centuries, benefiting from the increased abundance of nest sites due to human development.
• Concerned birdwatchers can contribute by erecting Chimney Swift nest towers to provide additional nesting sites OUTSIDE their chimney.
• Chimney swifts are protected by the Migratory Bird Act so removal from a chimney is not an option. Only the nests can be removed after the fledglings have left the nest.

Keep birds out of chimney flues by having heavy duty stainless steel chimney covers installed.

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Marge Padgitt is the author of Wood-Fired Heating and Cooking and host of The Hearth and Home Show on the HearthMasters YouTube Channel. She can be reached at www.chimkc.com.

Choosing the Right Hearth Appliance

Since there are so many options for hearth appliances, it can sometimes be difficult to make a decision. There are many choices available now from old school open fireplaces that actually take heat from the house to high-tech hybrid masonry heaters that heat an entire house with very little wood. Both gas and wood-burning appliances are available, and making the right choice can mean the difference between thoroughly enjoying a fire or regretting the day you decided to make a purchase. 

High-efficiency wood-burning insert

First and foremost, it is critical to purchase a quality appliance from a reputable hearth dealer or chimney sweep, and that the installer is certified by the National Fireplace Institute and/or the Chimney Safety Institute of America (preferably both), or the National Chimney Sweep Guild. These Certifications show that the installer is trained in their field. Also be sure to find out if the dealer is properly licensed by the local contractor agency and pulls a permit from the city codes department if required by your city. Professional dealers carry quality products. 

Buying from a big box store or local farm store may be tempting because of the low prices. The price reflects the quality, workmanship, and the warranty of the appliance, and that is why these types of stores sell the cheaper items. The metal is not as thick, the welds may not be as strong, and some stores even continue to sell non-EPA approved appliances which are not legal. You may also find non U.L. listed products online or in stores and that is a big problem since your local codes likely don't allow them. There is a reason - these appliances are inferior and could be a fire hazard in the near future. We've actually seen cheap stoves burn out in one season. 

Another problem with box store hearth appliances (other than electric units which are OK) is that they don't provide a qualified installer to install it. Gas and wood-burning stoves and fireplace inserts should only be installed by a qualified professional, and the manual likely states that or the warranty is voided. There is a reason for this, too - there are too many mistakes that could be made that can cause a fire or Carbon Monoxide hazard.

Below is a chart I made to help people choose the appliance that is right for them: 

If you can't read the small print, go to our website at www.chimkc.com and you'll find this same page under appliances. 

Things never to buy: 

• Non-U.L. Listed appliances
• Barrel-stove kits (unsafe and not U. L. listed)
• Non-EPA approved appliances
• Older appliances that were made prior to 1989 (f you have one, get rid of it unless it is a rare early EPA approved and U.L. listed product)

And do not sell your old appliance - have it hauled to the dump. It is illegal to install a non-approved appliance in most jurisdictions. 

Remember that your local jurisdiction may REQUIRE a professional to do the installation, including the chimney or flue liner and connecting pipe, components, chimney cover, wall and floor protection, etc. and won't let homeowners DIY. 

THIS IS NOT A DO IT YOURSELF PROJECT!

House fire 

Let me repeat that - this is not a DIY project. I don't care how handy you are, if you are an engineer, contractor, or genius -if you are not a hearth or chimney professional you will miss something important!

After all, we are talking about FIRE in your house! 

I don't suggest using non-venting gas logs (see my article To Vent or Not to Vent on this blog for more info), or pellet stoves. Pellet stoves require weekly maintenance by the homeowner, which they never do, and then the stove stops working. There are also times when in the middle of winter it is impossible to find pellets. So for this reason I say stay away from pellet heating appliances. Pellet grills and smokers, on the other hand, are very easy and fun to use and you can always get pellets in the spring.  

Keep in mind that the newer the appliance the cleaner burning it is. The Environmental Protection Agency has come down hard on wood-burning appliance manufacturers and they've really stepped up and are now making super clean burning products. Some wood-burning stoves and inserts are hybrids, which means that a catalytic combustor is installed along with a secondary burn chamber. 

Custom masonry heater
by Gene Padgitt

So what is my favorite heating appliance?  Masonry heaters, of course. Masonry heaters use 1/3 the wood of a new clean- burning wood stove to produce the same amount of heat. They also retain the heat for long periods of time then emit this in the form of radiant heat throughout the day or evening, and only require loading twice per day. And no fan is required. 

If you prefer gas, go with a high-efficiency direct vent gas insert that will provide ambiance and heating and is easy to use with a remote control! 

If you are considering a fireplace insert because your chimney is damaged by a chimney fire or rainwater, remember to ask your chimney sweep to remove the creosote in the flue and chamber first. Creosote can cause bad odors, but more importantly can catch on fire when exposed to heat from the flue liner that comes with the stove. 

I know, this is a lot to consider, but hopefully it makes your decision a bit easier. 

For more detailed information, get our book
Wood-Fired Heating and Cooking at Amazon.com

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Marge Padgitt is a veteran chimney specialist in Kansas City, Missouri. She is a former CSIA Certified Chimney Sweep and NFI Certified Wood-burning Specialist. Contact her at hearthmasters.office@gmail.com.