A leaking chimney can be caused by several factors. Reach out to the roofing experts at Feazel to determine the cause of your leak.

Spring weather can bring different weather conditions and that variety of conditions may expose a leaking chimney in your home. Leaking chimneys will happen and in this article, we’ll talk about what to expect with a leaking chimney, how to handle it, and what the leading causes of a leaking chimney are.  

Chimneys are typically made from strong materials, such as brick or stone but over time, mother nature can create weak points through the constant exposure to heat, cold, high wind, heavy rain, snow, and the thawing process.   

Feazel, in our 30+ years of experience, has seen many chimney problems and helped homeowners repair them before they turn too serious.  

Signs of a Leaking Chimney 

A leaking chimney doesn’t always show up the same way because of the parts of a chimney that are susceptible to wear and tear. If you are experiencing an active chimney leak, you may encounter the following;  

  • Water stains or leaks on the walls or ceiling around the chimney 
  • A musty smell comes from the fireplace. The smell may be more prevalent after a period of heavy rain 
  • Drips or leaks inside the chimney 
  • Water or condensation inside the chimney 
  • Cracks in masonry inside or outside the chimney 
  • Damaged chimney or problems with bricks and mortar

If you are experiencing any of these issues, you should contact a professional to inspect your roof. 

Chimney Leaks in Heavy Rain 

Considering that your chimney extends out of your roof and rises out into the elements, there are numerous points where wear can occur and lead to a chimney leak. Many of these places may be difficult to access and you should entrust a well-respected contractor to access, assess, and repair. Be sure to look at reviews on Google, Angi, or utilize Nextdoor to see if your neighbors have any recommendations.  

Chimney Flashing 

Flashing can be a leak point for your roof but what purpose does it serve? 

What is Chimney Flashing? 

Chimney flashing is a thin piece of metal that is installed around your chimney where it meets your roof. Your chimney flashing helps create a waterproof seal to prevent water from accessing your chimney and roof. It directs water away from the chimney and sends it toward your gutter system.  

Flashing can pull away from the chimney as the chimney settles over time. Or the flashing can rust and wear out. Same with the caulking used on the flashing. Weather and age can cause it to wear out and open the possibility of a chimney or roof leak.  

Leaking Chimney Cap 

A chimney cap sits on top of your chimney. It may have mesh metal sides and a metal panel covering the top. It prevents rain from getting into your chimney. Your chimney cap may also be called a chimney cover.

Rain and moisture inside the chimney can cause damage to the mortar and bricks. Additionally, moisture can damage dampers or crack the flue. The cap also keeps embers and sparks contained so it is important for your home. Wind may damage the cap making it easy for moisture to enter your chimney.  

Rusted Chase Cover 

A chimney chase cover is also known as a top pan. They are metal covers used to protect the top of your chimney. A chimney chase cover typically exist with wood-framed chimneys that have wood, vinyl, aluminum, or brick siding. It acts as a waterproof cover to shed rain, snow, and ice.  

Leaking Chimney Crown 

Your chimney crown is the white part on top of your chimney. It creates a water-tight surface to prevent water from penetrating the chimney. A crown may develop cracks and degrade due to weather exposure.

With freeze and thaw cycles, this damage can accelerate. As water freezes, it expands which will create larger cracks and gaps and make it easy for more water to enter your chimney.  

Leaking Masonry 

Brick and stone are porous and can absorb moisture during periods of heavy rain and your chimney may become saturated. A cold snap, while your chimney is saturated, is going to start to degrade your chimney and form cracks. 

Mortar joints that are made with too much sand can absorb water as well and start a chimney leak. Masonry issues can be addressed by using a waterproofing product to seal your chimney. The sealant may last for 5-10 years before needing to be reapplied.  

If the masonry is leaking, the other issue may be tuck-pointing. The mortar joint may have deteriorated over time and needs some TLC. Mortar typically lasts 25 to 30 years under the best conditions.  

Is It Normal For Your Chimney to Leak? 

We don’t want to normalize chimney leaks. Is water entry common? Absolutely.

A regular inspection or maintenance cadence will help prevent chimney leaks. Much like the rest of your roof, don’t wait for problems to occur. Being aware of the condition of your chimney will prevent big problems from happening. Schedule routine maintenance is valuable.  

What To Do If Your Chimney is Leaking 

You’ve noticed moisture on your ceiling or on the interior masonry. It’s always valuable to snap a picture of where the leak is occurring. Sometimes, these places can dry out before a roofer can get to conduct an inspection. If you can help pinpoint where the moisture is appearing, you may be able to help your roofer determine the point of entry.  

Second, begin the clean-up process. Place a bucket, rag, or towel under the area if applicable. Move any furniture to prevent it from getting wet.  

Third, call a trusted roofing company to conduct an inspection. There is a chance it is roof-related so reach out to a reputable roofing company to schedule a free inspection. There is a chance you may need a chimney company to inspect as well but it all depends on what type of leak is occurring. Some roofing companies offer chimney services as well.  

What Causes A Leaking Chimney? 

There are numerous parts of your chimney that can experience wear and degradation over time. Some of the more common causes of a leaking chimney are as follows;  

  • Weather 

Freeze-thaw cycles can ramp up a small crack into a large leak rather quickly. Remember, the chimney is exposed 24/7, 365 days a year. Your masonry has to endure heat and cold. It’s very common for cracks to appear over time which in turn will lead to a leak and then the water damage will begin. 

  • Construction or Waterproofing 

There could be faulty construction of the chimney or skimping on some materials when it was initially built. Additionally, your waterproofing may have finally ceased protecting the chimney and needs to be reapplied.  

  • Can A Woodpecker Cause A Leak? 

Not in your masonry but a woodpecker may damage the wood siding around a chimney thus opening it up for moisture to enter.  

  • Age of your home. 

Home settle and shift. These movements can cause stress in your masonry which will lead to cracks developing. Once you have a crack in your masonry, moisture can enter and a freeze-thaw cycle will cause that small crack to grow.  

How To Stop A Leaking Chimney 

We recommend getting regular chimney inspections to get ahead of any weather-related damages. However, we understand that annual inspections aren’t always possible for homeowners. In the case that you need to stop a leaking chimney, find a trusted contractor with ample reviews to inspect your property.  

Waterproofing Your Chimney

Waterproofing has several options, the DIY route or a professional route. Some of the pros may offer a warranty on their higher-end product. It may be advantageous to utilize a professional chimney company to ensure the best application to go with your warranty.  

Crown Repair 

Crowns will crack over time. Once you run through a freeze-thaw cycle, that small crack will get a little bigger. If left unchecked, your crown will become loose and chunks will flake away. If water gets into the bricks, spalling will occur which may lead to larger repairs.  

Replacing Your Chimney Cap 

Is your chimney cap broken, missing, or the wrong size? Talk to a professional to discuss replacement.  

Replacing the Flashing 

Replacing requires removal and then replacement. Considering your chimney extends out of your roof, you may be at a considerable height. While the height may not be an issue for some DIYers, the handling of tools and supplies makes replacing flashing yourself a difficult task. We encourage you to work with a professional for replacing chimney flashing.  

Leaking Chimney Repair Near Me 

Feazel has been serving Ohio, Indianapolis, and Raleigh for over 30 years. We’ve helped countless homeowners with their chimney and roof issues. Contact us for a free inspection. Our award-winning team will be happy to serve you.