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Chimney Repairs: The Complete Guide

chimney masonry repair

 

The Complete Chimney Guide

With chimneys and fireplaces, repairs and maintenance are inevitable.

No matter the age or design you may have, it’s almost certain your chimney or fireplace will experience some issues that require maintenance or repairs.

Even a bird’s nest in your chimney can cause you some considerable & costly problems.

The major reasons behind chimney issues will definitely vary but in this article we’ll cover their most common problems and the causes.

 

masonry chimney

Masonry Chimney 101

A masonry chimney can be made up of a variety of materials including bricks & mortar, concrete, block, stone, flue tile, cast iron and steel.

These different materials can be extremely vulnerable to rainwater and other elements if not properly installed or maintained.

Any external hazard can cause considerable aesthetic or physical damage to these extremely porous chimneys.

For these reason’s it’s vital to keep an eye on your chimney.

Before we dive into common repairs, here’s an infographic on the components of chimneys.

 

chimney infographic

 

Common Chimney Issues

Now you should have a basic understanding of the different components that make up your chimney.

Don’t worry if you still feel lost because we’re going to cover everything in much more detail.

Let’s dive into what can actually go wrong with your chimney and/or fireplace.

 

 

cracked chimney

 

Cracks

Cracks in the crown or firebox are even considered a fire hazard by the NFPA (National Fire Protection Association).

The reason is because when a chimney is being used and smoke is emitted, it carries waste particles from the fire.

This is the black smoke you see leaving a chimney when it’s in use.

These waste particles build up and can get accumulated on the interior walls of the chimney and especially in any cracks there may be in the masonry.

The picture below is an example of a pretty severe buildup in a chimney flute that is a definite fire hazard.

 

creosote buildup

 

The masonry cracks essentially become little pockets of waste particles and carbon buildup, some of which is flammable.

The real culprit is an oily substance called Creosote which is similar to soot except that it can be reignited from sparks. If there is considerable buildup of Creosote, it could be ignited by a rogue spark when the fireplace is in use.

 

chimney fire causes

 

Creosote is a flammable substance that starts off as a residue of smoke and vapors from burning wood.  It clings to the venting system as it builds up as hard and flaky deposits.

For an in-depth article on Creosote, click here.

It is recommended that a chimney cleaning be performed when either soot or creosote buildup reaches ¼ inch or more.

Fire hazards are one of the biggest reasons to monitor the mortar of your chimney and fireplace for cracks.

In fact, there are over 61 house fires caused by dirty chimneys per day in the United States.

[bctt tweet=”There are over 61 house fires per day caused by dirty chimneys in the U.S.” via=”no”]

 

If you do find some cracks in your chimney or fireplace, don’t panic.

We fix these types of fireplace cracks all of the time, however, don’t wait too long to have it repaired as the potential for damage could worsen.

 

chimney-cta

 

 

 

chimney water penetration

 

Water Penetration

There are multiple entrance points for water penetration to occur and water entering the chimney can give rise to several big problems.

Aside from the usual devastation and mold that water penetration can cause, it also has another scary result.

When water mixes with the creosote it becomes acidic which, in turn, causes premature rusting of the damper and speeds up the deterioration of the brick and mortar in your chimney & fireplace.

Keep in mind that water can enter the chimney through any cracks in the crown or in the chimney shelf itself.

It can also enter because of faulty flashing where the chimney meets the roof.

This water can not only cause the decaying of the exterior mortar but can also extensively damage interior walls and structural elements of your home.

All of these hazards can be avoided by keeping a regular chimney checkup schedule and ensuring that there is no room for water infiltration in any part of the chimney or fireplace.

Water repellent treatments sometimes referred to as “waterproofing” are also very effective at keeping water out of your chimney

 

cracked-chimney-crown

 

Damaged Chimney Crown

The chimney crown is the top element of the chimney which itself acts as a shield from a number of dangers. It covers the chimney from the flue liner to the chimney edge.

The crown should have a downward slope which directs the water away from the flue edge. It must also have an overhanging drip edge which must direct the run-off from the crown away from the chimney in order to ensure that there is no erosion of the brick and mortar in the vertical surfaces of the chimney.

A proper chimney crown should be constructed in an overhanging manner of a Portland cement-based mixture and should be beyond all sides by a minimum of two inches.

 

chimney flashing

Faulty Flashing

‘Flashing’ means sealing the area between the roof and the chimney which will prevent rain water or snow melt from going down into the house. It can act as a huge safeguard for the ceilings, walls and floors which would otherwise be damaged extensively every time it rained.

It’s basically an expansion joint between two dissimilar materials. It comes with the ability to allow both the roof and the chimney to expand and contract at their own rates without causing any problem to the waterproof seal.

faulty flashing chimney

Above is a real world example of flashing on a recent construction home that has failed and been allowing water to penetrate the house.

 

 

improper chimney dimensions

 

Improper Dimensions

Very few residential masonry contractors are actually qualified to build a masonry chimney, which means that most of them will unknowingly set you up for failure.

There are two major construction flaws that commonly cause issues for chimney owners.

  1. The first being the chimney might be too short to prevent downdrafts.
  2. The areas between the lintel and throat are not tall enough to allow the smoke to “roll” before it enters the smoke shelf.

 

 

masonry chimney cap

 

Chimney Caps

A cap is essential for any chimney because without it the water will be pouring right into your fireplace. It will also prevent birds and squirrels from making their way into your house through the chimney opening.

It essentially keeps out debris you don’t want in your house like leaves.

 

 

crumbling brick chimney

 

Chimney Deterioration

Like any other building material, brick and mortar are subject to deterioration after exposure to the elements over a certain period of time.

The external elements gradually degrade the walls of the chimney.

If your chimney is to the point of major deterioration and is crumbling, then it is time to rebuild because the bricks and mortar have crossed their survival limit.

 

 

leaning chimney

 

Leaning Chimneys

If your chimney is leaning even just slightly. Call a professional to further assess the issues, as a leaning chimney could be in danger of collapsing and causing extensive damage to your property.

 

Extra Resources

 

In conclusion, this is by no means an exhaustive list of the problems that you can encounter with your chimney or fireplace but just the most common issues that we find.

We always recommend an annual professional chimney inspection, to not only guarantee your family’s safety but to also prevent major costly repairs down the road.

Remember to keep an eye out on your chimney & fireplace and visually inspect it monthly to ensure that there are no immediate issues.

A monthly 5-minute visual checkup could save you thousands in chimney and fireplace repairs.

Here’s a quick chimney & fireplace inspection checklist:

  1.  Visually inspect the fireplace hearth for any loose bricks or cracks.
  2. Visually inspect the firebox to make sure it has no cracked or damaged bricks.
  3. Check the damper to make sure it is operational.
  4. Visually inspect the exterior chimney for damage or cracks.
  5. Repair any cracks or damage before further operation of fireplace.

 

We hope you found this article helpful on the common issues you may face with your chimneys and fireplaces.

If you have any questions, concerns or just want to get a second opinion, don’t hesitate to reach out to us and we’ll help in anyway we can.

 

If you’re in the Greater Houston Area and are in need of a professional chimney inspection, we recommend Lord’s Chimney Services .

Disclaimer: Brick Restoration is not being compensated for any referrals or recommendations made on our website.

If we recommend a business, it’s because previous customers have reported a good experience.

Your results, however, may vary.


About Brick Restoration, Inc.

We are the highest rated full-service masonry repair and installation contractor serving the Greater Houston and surrounding areas.

Known for our expert workmanship and outstanding results, our extensively trained masons and patented technology separates us from other masonry contractors.

Schedule your free estimate today to meet with one of our Restoration Specialists.

This article was originally written by BestMasons.com.

Diana Yera

Diana Yera

Co-Owner & Marketing Director

29 thoughts on “Chimney Repairs: The Complete Guide”

  1. My chimney has a huge crack in it. I had no idea that not cleaning my chimney could lead to it breaking. I wonder if the inside of my chimney looks like the one with all the suit in it. My wife and I will have to see if we can have someone come out this week and fix it for us.

    1. Hey Jon, Don’t worry you are far from alone and who can blame you. It’s easy not to think about your chimney like that. Don’t hesitate to reach out for your appointment, we’re here to help!

  2. I agree, if there are clear signs of deterioration then it is probably best to call a chimney repair service. After all, you will want to make sure that the bricks are in good shape and, if they’re not that they can be repaired. That way you chimney is always operating at peak efficiency.

    1. Exactly! Here in Houston, our fireplaces don’t get used too often. So before the winter season starts, it’s a good idea to get an inspection to make sure its in proper working order.

  3. My chimney brick has been flaking off for years; currently have lived there for 25 years; have a fireplace insert, and have not burned wood in this fireplace since living here; need masonry work done and would appreciate an estimate in repair cost. Thank you.

    1. We would be happy to help with this! If you’re in Houston or the surrounding area, we can set up an appointment for a free estimate and get this work done asap for you!

  4. Thanks for helping to understand my chimney better! It really helped me when talked about the crown of the chimney and how it acts as a shield. In my opinion, chimneys should be routinely cleaned and checked for erosion. My wife and I had to recently have our crown re-sealed because it had eroded too much.

  5. I have what looks like aluminum molding around my chimney which is coming off more than likely due to the storms we been having. how can that be repaired

    1. The aluminum molding is called flashing and thats a part of any chimney, it prevents water from coming in through the seems between the chimney and the roof. Typically a roofer or a chimney company would be the best people to contact for this repair.

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  7. Thanks for mentioning that if you have cracks in part of your chimney, that can be considered a fire hazard. My dad bought an older house and wants to fix it up, and one of the things he wants to restore is the chimney. I will have to tell him to make sure to have that repaired first so that he can prevent fire hazards in his home.

  8. The blog post was insightful and informative. Would love to read more of this type of blogs.

    We, Buffalo Grove’s Tuckpointing And Masonry, are here to help by offering our Tuckpointing services that can last for decades. Check it out, buffalogrovetuckpointing dot com

  9. The was an insightful and informative blog about chimney repair. Common chimney issues should be checked like damaged chimney crown, faulty flashing, chimney deterioration, etc. Would love to read more of this type of blogs.

    We, Buffalo Grove’s Tuckpointing And Masonry, are here to help by offering our chimney repair and rebuild services that can last for decades. Check it out, https://buffalogrovetuckpointing.com/

  10. The was an insightful and informative blog about chimney repair. Common chimney issues should be checked like damaged chimney crown, faulty flashing, chimney deterioration, etc. Would love to read more of this type of blogs.

    We, Buffalo Grove’s Tuckpointing And Masonry, are here to help by offering our chimney repair and rebuild services that can last for decades. Check it out, buffalogrovetuckpointing.com/

  11. Thank you for pointing out that having cracks in a portion of your chimney might be a fire danger. The chimney is one of the improvements my dad wants to make to the older home he recently purchased. I’ll have to advise him to get that fixed first so he can avoid creating a fire hazard in his house.

  12. I appreciate you letting us know that a masonry chimney is made up of a variety of materials like bricks and mortar that can be quite vulnerable to rainwater and outdoor elements if we don’t maintain it regularly or install it properly in the first place. My grandmother’s house has a masonry chimney, and since I’m spending winter there, I need to get it serviced first to avoid issues later during the coldest time of the year. I’ll take note of this while I look for a chimney services inn Colbert to hire for help soon.

  13. It’s excellent that you went into detail on whether or not chimney cracks provide a fire risk. One of the things my dad wants to refurbish is the chimney because he acquired an older house and wants to do some repairs. I’ll have to advise him to get that fixed first so he can avoid creating a fire hazard in his house.

  14. I appreciate that you pointed out that if we don’t maintain or construct a masonry chimney correctly from the beginning, it may become highly sensitive to outside factors and rain. A masonry chimney is composed of a range of components, including bricks and mortar. Since I’ll be spending the winter at my grandmother’s house, I should get the brick chimney serviced now to prevent problems during the coldest part of the year. I’ll remember this the next time I’m looking for chimney services in Colbert, Texas, to employ.

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