What Is A Chimney Crown? How Do They Work?
The chimney crown is an important part of your chimney. Its primary function is protecting your chimney from water. The techniques used to repair chimneys vary between different chimney repair company’s. Some chimney repair companies use waterproofing agents that extend the life of the crown. Other companies cut corners by using lower-quality materials. It is important to know about chimney crowns to make the right decision about your chimney crown repairs.
What is a chimney crown?
A chimney crown is a large slab of concrete that covers the top opening of the chimney, protecting the brick and mortar chimney structure from water. Chimney crowns are sometimes called chimney washes. The crown is commonly made of concrete, but it can also be metal or stone. Crowns should not be mistaken for the chimney cap, which is made of metal and primarily covers the flue. You’ll find the chimney crown above the last layer of brick at the top of your chimney. It is typically about three to four inches thick and slopes down at the edge.
There are a few types of crowns:
- Cast-in-place: Suitable for large chimneys and made of concrete,
- Precast: Ideal for smaller chimneys and made of concrete
- Floating crown: Built with an overhang that is approximately two inches above the chimney. This type of crown takes longer to install but usually lasts longer than other crowns.
The Role of the Chimney Crown
The primary role of the chimney crown is to keep water from entering the chimney. It is considered the first line of defense for the overall masonry. If the crown should fail, it can cause your chimney to leak. If you allow the crown to stay damaged, it can result in the rest of the masonry to crumble. By keeping the chimney crown in good condition, you can keep your chimney and the rest of your fireplace in good repair, too.
Common Chimney Crown Problems
There are many problems that can arise with your chimney crown. Professional chimney repair technicians like ours can identify these problems.
Be aware of such issues as:
- Sealant problems
- Cracked crown
- Masonry degradation
- Chimney leaks
The frequency and type of issues are primarily determined by the age of your chimney, how well it was constructed, to begin with, and how well you take care of your property. Do not ignore your chimney crown. Bigger problems arise when you put off issues year after year.
Chimney crown problems can lead to the deterioration of your chimney. Deterioration continues to worsen over time. It is always best to address crown issues early. You don’t want to get into a situation where the entire chimney has to be rebuilt.
How to Keep Your Crown in Good Condition
Schedule an annual chimney inspection every year. Be sure to use a qualified, professional chimney service company with a good reputation. Some companies are better than others. Pay close attention to their google reviews.
When the crown is in reasonably good shape but still cracked, crown sealant can be used. However, if the crown is already severely damaged, just applying sealant isn’t going to happen. You will need to have the crown rebuilt.
Having a professional inspect the chimney will make it easier to identify what the best fix is. In some instances, it’s best to remove the existing crown and have the surface cleaned. From there, concrete and wire mesh can be added in order to recreate the crown and reinforce it.
A good chimney service technician will identify chimney crown problems and make the right recommendation. Make a wise decision and get the repairs as soon as you are made aware. Crown damage worsens over time. More damage costs more to repair.
Read our previous article to learn more about chimney crowns.
Causes of Spalling Chimney Bricks & How To Fix It
The word “spalling” might not be familiar but the symptoms are easy to identify with a simple walk outside to look at your chimney. Chimney spalling is the deterioration of the bricks or mortar of a chimney. The spalling of chimney bricks is a common problem that can lead to significant chimney damage and extensive repairs. It is essential that homeowners understand the cause of chimney spalling and how to fix it.
What is Chimney Spalling?
When you look at your brick chimney, does it look like it used to? Spalling refers to the deterioration of the brick, mortar, or blocks making up a structure. From a distance, you may only notice that something doesn’t look right. Closer examination often reveals the symptoms of spalling.
- flaking surfaces
- cracks in the mortar, bricks, or blocks
- chunks of brick or block missing
- pieces of your chimney on the ground
What Causes Chimney Spalling?
When water freezes, it expands. The freeze-thaw cycle can split a boulder. The same cycle that splits boulders does similar damage to any bricks in your chimney. There are several ways that destructive moisture gets into chimney bricks.
- Older bricks may be softer and lack the glazing that protects the surface. The same issue can arise from newer homes that were built using salvaged bricks. The salvaged bricks may not have been designed for exterior use at all.
- Improper pressure washing can damage the surface of your bricks. The high pressure pushes water into microscopic crevices, and the next freeze expands the cracks.
- Leaks in your gutters, chimney flashing, or crown let water into the structure of your chimney, and this creates more places for spalling to occur.
- Storm damage from wind, debris, and hail can create avenues for water to enter your chimney bricks.
How Do You Fix Spalling Chimney Bricks?
During your annual chimney inspection, a professional will examine the inner and outer surfaces of the chimney along with surrounding flashing, etc. Their training and experience help identify all areas of concern. Cracks in a chimney crown, pitting in bricks, flaking surfaces, and other symptoms are looked at in context.
- Chimney flashing may need to be repaired.
- A chimney cap may need to be replaced or added to keep the rain out of the chimney.
- Mortar or crowns may need to be repaired with materials containing waterproofing sealant to prevent moisture away.
- Missing bricks or mortar may need to be replaced and sealed.
- If the damage is extensive, the chimney may need to be rebuilt.
When you see spalling chimney bricks on your property, you have evidence that damage is occurring. It is important to hire the right chimney repair company. Repairing that damage quickly will keep the damage from getting worse. Regular inspections and maintenance are the key to preventing spalling chimney bricks.
Understanding chimney crowns
Most of our customers come to us asking the same questions about their chimneys. A homeowner in Howard County recently asked what is a chimney crown, and how does it work? It’s vital to understand chimney crowns, as it can be the source of various problems down the road. Chimney crowns repairs are one of the most common repairs. Luckily for you, we are here to explain everything you need to know about chimney crowns.
What is a chimney crown?
Sometimes referred to as a chimney wash, a chimney crown is a large slab of brick or concrete that covers the top opening of the chimney. Finding the Chimney Crown is relatively easy, as its name suggests the rest on top of your chimney on its last layer of brick. It is typically about three to four inches thick and slopes down at the edge of the bricks. Most chimney crowns are concrete, but they can also be metal or stone. They are not to be mistaken for the chimney caps, which are metal and cover the chimney flue. If you wish to know more about what chimney caps, read this article.
There are a few types of crowns:
- Cast-in-place: Suitable for large chimneys and made of concrete. Cast in place chimneys involves using steel forms to construct the chimney crown on-site.
- Precast: Ideal for chimneys that are 16×16 or smaller or new construction. Precast crowns are not suitable for chimney jobs involving large chimneys. The weight of the concrete makes this solution impractical for larger chimneys.
- Floating crown: Floating cast crowns are built with an overhang that is approximately 1 1/2″ to 2″ above the chimney. Floating cast chimney crowns require more time to install than the other options. As a result, the service cost may be slightly higher. In most cases floating cast crowns last twice as long. In most cases, longevity makes it worth the minor increase in cost.
Why do chimneys have crowns?
The primary role of the chimney crown is to keep water from entering the stack. It is considered the first line of defense for the overall masonry. If the crown should fail, it can cause your chimney to leak. Chimney leaks can cause the masonry to crumbing, leading to severe structural damage. By keeping the chimney crown in good condition, you can keep your chimney and the rest of your fireplace in good shape. You will avoid costly, time-consuming chimney repairs.
What are the common chimney problems?
There are several problems that can arise with your chimney crown. Be aware of issues such as:
- Sealant problems
- Cracked crowns
- Masonry degradation
Scheduling a chimney service company like ours to inspect your chimney will help identify chimney problems. You may encounter all sorts of issues based on many factors such as the age of your chimney, its construction quality, and how often is it inspected. Annual inspections catch problems in their early stages. Chimney crown problems can also lead to issues with cracks in the flue. Chimney crowns or one of the many common causes of chimney leaks.
What maintenance is required for chimney crowns?
Just as you should schedule roof inspections periodically, you want to have a chimney sweep inspect your entire chimney inside and out. They can identify if there are issues so that you can schedule a chimney repair. You may also be able to conduct a visual inspection on your own to see if the chimney crown is cracked or damaged in some way. However, your visual inspection is not a suitable replacement for professional service. Annual inspections are the best way to catch problems in their early stages.
Conclusion
Chimney crowns are one of the most critical parts of your chimney system. They are often made of concrete, and there are several options for structuring them. The best way to prevent chimney crown problems is by hiring a professional chimney service company to inspect our chimney every year. Annual inspections will not prevent problems. However, it will result in catching issues before they become costly.
What Is A Chimney Flue?
During a recent chimney inspection at a home in Rockville, MD, we discovered that chimney liner needed to be replaced. The homeowner quickly asked, “So, what’s a flue?” We were glad that the homeowner asked that question. It shows that the homeowner cared enough to want to know everything that is happening with their chimney. Most people don’t give much thought to their chimneys, thinking of them as simply a low-tech invention which funnels smoke out of their homes. But in reality, a chimney is an evolved structure with several essential components that work together to move smoke and heat safely and efficiently out of your house, and one of the most important of these parts is the flue, or liner. Your chimney integrity and maintenance is critical to fire safety, that is why you should always have your chimney professionally inspected and clean by your local fireplace services company.
What Is A Chimney Flue, And What Does It Do?
At one time, most chimneys were constructed without a flue liner, but because of safety concerns, most local building codes now require one to be installed. Various tests conducted in the mid-20th century showed that unlined chimneys did a poor job of protecting a structure from fires and damage. Without a flue, the heat was transferred rapidly to the surrounding wooden structure, setting them aflame in as little as a few hours. The chemicals released by combustion can act directly on the brick, stone, and mortar, causing rapid deterioration and failure of the chimney, and possibly releasing deadly carbon monoxide into the home. A flue liner also allows for the correct sizing of the chimney configuration and a proper draft, which is necessary for efficient combustion and prevention of the buildup of creosote in the chimney, which can lead to fires.
Types Of Chimney Flue Liners
There are three basic types of flue liners used today:
- Clay Tile Liners – This is the most common type because it’s inexpensive and easily available and works well in a properly maintained chimney and open fireplace. Most older homes with liners will have this type. With regular cleaning and maintenance, they can last for decades. They aren’t as effective at containing chimney fires or the chemical by-products of gas fireplaces, and they are susceptible to cracks. When significant cracking has been detected by a professional Chimney inspection, it is usually recommended that a new liner be installed rather than attempting repairs.
- Metal Liners – Usually made of either aluminum or, more commonly, stainless steel. They are very safe and durable and do a good job of protecting a chimney and lessening the need for expensive repairs. Metal liners can be constructed for almost any type of chimney, and can be flexible or rigid, making for easier and less costly installation. They sometimes need to be used with an insulating material for higher temperatures.
- Cast Liners – Commonly made out of cement or a like material, these work well for their intended function and also contribute greatly to the structural integrity of the chimney, and are especially recommended for older chimneys that need support. They can be poured directly into the chimney creating a seamless and leak-proof lining. These can also handle higher temperatures than other liner types, something around to 2,100 degrees. That makes them a better protection against chimney fires and creosote buildup. The drawback is that if they are somehow damaged, which is unlikely, it requires a complete removal and replacement.
Your chimney flue is very important to the safety of your home and family, and to the useful life of your chimney. It’s a good idea to have your chimney inspected and cleaned at least once per year, especially before cold weather arrives. That way if any damage is found, you can get it repaired in order to start using your fireplace or woodstove immediately. If you are concerned if your fireplace needs to be repaired or not, here are 6 Signs that you need chimney repair.
All Pro Chimney Services operates in Washington D.C., Virginia, and Maryland. Contact us today for consultation and an estimate.
How a bad chimney causes roof problems
Your roof’s most prominent feature is also ironically its biggest threat. Problems stemming from a poorly maintained chimney – whether it be bad masonry, cracked edges, or even a possible chimney fire – can cause major damage to the rest of your house, especially your roof. We were recently contacted by a homeowner in Columbia, MD who had a damaged chimney that affected their roof.
Many homes have a chimney, even if they no longer have a fireplace. Some homeowners like to keep their chimney because of the character it provides their home, while others have one because they still have an active fireplace.
No matter what side you fall on, there are several things you need to know about chimneys even if you don’t use your fireplace all that often. Basic things like weather damage can wear down your chimney over time, often leading to other major problems down the line. And when it comes to your roof, a poorly maintained chimney can cause roof damage, which can be extremely costly.
Let’s set the record straight.
Routinely maintaining your chimney and calling in professional chimney sweepers goes a long way to preventing a ton of costly roof repairs in the future. In this article, we are going to discuss:
- The different problems related to bad chimneys
- Various causes for these problems.
- The types of damage they can cause your roof if left unchecked.
When it comes to protecting your roof, knowledge, and awareness are key. The sooner you can detect major problems, the sooner you can solve them, and prevent additional damage.
Chimney Fires
Chimney fires are unfortunately common for homeowners who neglect essential maintenance. A chimney fire can spread to your roof and the rest of your home easily.
What Are Some Signs That It’s Happening?
Common indications include:
- Loud crackling and popping
- A low rumbling sound coming from the fireplace
- Dense smoke
- A pungent, burning scent invading your home
However, some chimney fires are barely audible and hard to notice early on, so taking the right preventative measures is vital.
What Can Cause It?
Over time, heavy weather can break down the structure of a chimney. However, flue lining damage is a major culprit for fires. Flue lining is the material used in masonry to prevent heat from becoming trapped in the chimney. Seeping water can damage this lining, causing thin slices of tile to collect at the bottom.
Also, creosote, a black material with a tar-like texture that collects in your fireplace, can build up as well. Creosote forms naturally the more you use your fireplace and can thicken to several inches over time. The material itself is flammable and thus a major fire hazard. Creosote buildup can also choke your chimney of airflow, making your fireplace much less effective.
How Can I Prevent It?
Calling a sweeper is one method. Damage to flue lining can be difficult to spot, so professional chimney sweepers use specialized cameras to check for cracks and other damage within the chimney itself.
Also, you’ll want to consider getting stainless steel flue liners, which are popular with homeowners since they tend to last a long time and come with generous warranties.
But in general, you can’t beat regular inspections and cleaning. Like anything in life, being proactive will save you a lot of headaches down the line.
Decaying Masonry
Whether we like it or not, masonry does break down over time. Depending on which region you live, your masonry will wear down from the effects of weathering.
What Can Cause It?
Inclement weather can chip away at stone and brick, especially near the mouth of your chimney. Even basic rain can seep into the cement between the bricks, which, when frozen in cold weather, contributes to cracking.
How Can It Damage My Roof?
Broken cement can fall onto your roof. Plus, the chimney’s weakened structure can collapse over time, posing a threat to not only your roof but also passers-by on the ground.
If your chimney does break off and collapse, it can cause extensive damage to your roof as the weight of it can collapse other areas of your roof, damage your shingles and tiles, and much more.
Water Damage
Water damage is one of those things that terrified homeowners across the world. When it comes to your chimney, water damage can erode it, causing it to crack, and in extreme cases, break off completely.
How Can It Damage My Roof?
As stated on sheltonroofing.com, sometimes cement and tar aren’t enough to keep water out. If your chimney is leaking water, the damage can eat into the roof around the chimney quickly. If water is gathering around your chimney, there is a good chance that it will rot your roof away with it.
What Can Cause It?
Decayed chimney flashing is a leading cause. Flashing is the material applied to the base of the chimney to prevent water from seeping into your attic.
What Are Some Signs That It’s Happening?
- Chimney spalling, or the flaking of brick and stone. This symptom is easily seen on your roof where shards of your chimney collect.
- Efflorescence, an official term used in construction to refer to salts encrusted on brick and mortar that show up when water seeps through the masonry.
- Damaged wallpaper in the house near the chimney
How Can I Prevent It?
Even well-designed chimney flashing needs to be maintained every now and again, so call a professional team like the All Pro Chimney Service team if you ever notice rusty spots or holes in the flashing.
Also consider getting a chimney cricket, a small feature on your roof that diverts rainwater and debris away from the chimney as they flow down the roof.
Animal Infestation
What Can Cause It?
When your chimney cap is damaged or missing, the open and exposed chimney mouth is practically an invitation for squirrels, rodents, insects, and other wildlife to enter and make a home. Birds can also build nests in chimneys, causing a blockage.
How Can It Damage My Roof?
Animals living in your attic can chew at your insulation and other parts of your roofing, so get that cover repaired as soon as you can. Additionally, a chimney cap can also prevent water from entering.
Calling the Experts
A lot of the damage-inflicting your chimney and roof are difficult to see from the ground, and since climbing onto the roof, yourself is dangerous. If you’re inexperienced when it comes to roof repairs, we recommend you call an experienced roofing company. Like chimney repairs, an experienced roofing company will know how to fix any problems you are experiencing with your roof properly.
All Pro Chimney Service offers dedicated roof repair services to customers in the Baltimore and DC Metro areas. Do not hesitate to contact us if you have any questions about your chimney, its condition, and how you can maintain and stay ahead of potential problems.
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