If you have found water stain forming around your fireplace after a rainy day, you’re in for quite a stressful situation. Aside from the musty smell, you’ll also have to deal with discoloration on the wall and a damp patch on the ceiling. And, of course, you’ll have to answer the first question that would pop into your mind: Where did the water come from?
This “quite stressful” situation is what happens when there is a fireplace water leak. There are a number of possible reasons for this, but the most common problem is in the chimney flashing. This is the part of the chimney that stops rainwater from going to the space or area where the chimney and roof meet.
A damaged, worn-out, corroded, or loose chimney flashing is never good news because it means water can easily get into your home. Additionally, as the water may not have gotten in through the leak, working it out can be a bit tricky.
The good news, though, is that there is a way out of this situation – and the first step is to learn and understand what the signs of a chimney flashing leak are. This will give you an idea of what to pay attention to, as well as when to call in professional help.
Understanding What a Chimney Flashing Is
Not a lot of people are familiar with or even aware that there is such as thing as chimney flashing. It’s like an invisible part of the house, but only until problems, such as a water leak, crops up.
Chimney flashing refers to the metal sheet or sheets installed around the junction of the roof and the chimney. Its function is to move water away from the chimney so that water does not get into the home structure and create water damage. The flashing keeps the vulnerable area protected from rainwater.
A flashing system typically has a number of components, specfically step flashing, counterflashing, and base flashing.
Step flashing is placed between the chimney and shingles, in stair-step patterns, with the metals overlapping each other. It redirects the water, keeping it away from the junction. Counterflashing is intended for protecting and covering the flashing’s upper edge. Base flashing, on the other hand, is in the bottom part of the roofing material and against the chimney. Also known as apron flashing, it is L-shaped and works with chimney flashing and counterflashing so rainwater is directed down, away from the junction, so that your home is safe from water damage.
Fits three components work together; chimney flashing is not protected from temperature changes, wind, rain, and other harsh elements. General wear can also significantly affect sealants, fasteners, seams, and especially the metal.
As flashing isn’t easily visible from the ground, it will take some time for you to notice that there is a problem.
How Does A Damaged Chimney Flashing Cause Chimney Leaking and Fireplace Water Leak?
For water to stay outside and not get into your home, your roof and chimney should work hand-in-hand. If they don’t, rainwater can easily seep through structures as there is no clear path for it to go through.
Most of the time, a chimney flashing leak starts as something small, something that some homeowners would consider insignificant. The most common examples of this are a gap-causing corrosion, a failed seal, loose flashing, or a separated seam.
When there’s an opening and water gets to it, it will travel and affect not only the roofing materials but also parts of the structure, until it eventually seeps into your home. And this is the reason why it is often difficult to monitor or track a fireplace water leak. It can be deceiving.
For example, you believe that the water is coming straight through the chimney because you spied a small stain near the fireplace. But the truth is that water entered somewhere else – a different area – and then travelled and became more visible. This happens because there is an opening.
For this reason, it is not advisable to just paint over an interior stain. It is not a good solution – it’s actually not a solution at all. It’s just a temporary fix, so the water leak source is still there. It will disappear temporarily but may reappear after a strong rain.
Signs That Mean Your Chimney Flashing May Be Damaged
1. There are water stains surrounding the fireplace.
If you spot discoloration on your wall or ceiling near the chimney or fireplace, there may be damage on your chimney flashing. These stains are often yellowish or brownish – generally darker than the surface surrounding it. They often become more visible in the aftermath of a storm, but then they dry up as soon as the weather clears.
In most cases, the discoloration appears in the same area after a rainfall. This is a pattern that shouldn’t be taken for granted. Since the stain is recurring, it may be an indication of a water intrusion problem. This should be immediately checked and verified so it can be addressed properly.
2. There is dripping or dampness in the area around or near the fireplace.
You have to be extra attentive every time there is a heavy downpour, for it is after this that the signs typically materialize. Moisture, for example, becomes easier to notice after the rains have stopped. Focus on the area around the fireplace as that is where moisture typically develops. As soon as you notice this, check your chimney and roof to determine if the dampness was caused by a chimney flashing leak.
Sometimes, moisture formation is not caused by flashing but by other factors, such as roof penetration, roof covering, masonry, or chimney cap issues.
The best thing to do is to always observe and pay attention so it will be easier to spot a leak when it starts forming. You’ll also need to observe the weather – both before and after the leak developed.
3. There is an unpleasant smell
Another sign that there may be a fireplace water leak is a persistent damp or musty smell. For example, when you walk into the kitchen, did you notice if it smelled different, especially after heavy rains? If this is the case, then you need to have the area checked for leaks.
Green or black stains in the firebox can also point to mold caused by moisture.
However, an unpleasant smell only signifies a chimney flashing issue if it comes with dampness around the area or water stains. If this is your situation, have your chimney and fireplace inspected right away.
4. The flashing is heavily rusted, bent, lifted, and separated or loose
It may not be easy for some, but if you can comfortably and safely check the area around your chimney from where you are in the grounds, use that opportunity to determine if there are signs of deterioration. If the flashing is already rusted, bent, lifted, loose, or damaged in any way, it may not serve as a reliable protector against the rain and other similarly harsh elements. Red or brown stains near the top of the chimney can also indicate rusting and water exposure.
This is quite common for older or overused chimney flashing since it is vulnerable to corrosion. When metal starts to corrode, openings or cracks start to form, and they provide a way for water to get in.
It’s important to remember, though, that flashing problems are generally not easy to detect or determine, since some may be hiding underneath roofing materials. While visual inspections from the ground can help, they do not really give you a complete idea of your chimney flashing’s current situation.
5. The sealant has cracked or is shrinking
Vulnerable areas like flashing joints are often further secured by sealants. However, since these areas are regularly exposed to changing temperatures, rain, and the sun, these seals can become loose or separate, shrink, or crack, and older tar-based flashing sealants can harden and crack over time. When this happens, water can get through the crack or opening.
While the initial reaction would be to apply an additional layer of sealant, this won’t be an effective solution for more serious problems. Chimney flashing should be sealed with waterproof materials, but surface patching alone is not a full fix when the flashing itself is damaged. A damaged chimney flashing needs a specific, more permanent solution – one that addresses the root cause of the problem. If you have a regular chimney specialist in your phonebook, you may want to call them.
6. The attic has water damage
If you have an attic and you can easily access it, always find time to do a regular visual check of the area, especially after a heavy rainfall – and most importantly, if your chimney goes through the said room.
While checking the attic, try to find signs of a chimney flashing leak. And if you find one, address the problem right away before the damage spreads to your main living area. The clues you need to observe include water stains on wood, damp insulation, and any sign of previous moisture on the area around the chimney.
But when checking, remember that water can move from one area to another, so do not immediately assume that it entered the room through the crack. As such, moisture gathered around the chimney does not necessarily make that area the main entry point.
7. There’s a recurring leak
A recurring fireplace water leak is probably the best indicator that there is something wrong with your chimney flashing. Any repetition, especially moisture, is a clear warning sign. No matter how tough you are at cleaning the stains, they’ll only disappear for a time. Once the heavy rains or storm set in, you’ll see stains on the same spot again. This could go on and on and can cost you more in the long run. Leaving the situation as is can also open your home to more complicated problems.
When repeated moisture is left unattended, it can lead to the deterioration of parts of your home, including the drywall, insulation, the wood, and most of all, your roofing materials.
Dealing with the issue right away will help determine the source of the problem. The sooner this is done, the better chances you’ll have of permanently fixing the issues, long before it can become a more complicated situation.
Common Causes and Possible Reasons for Chimney Flashing Failure
There is never really only one reason why your chimney flashing is leaking or has started leaking. Oftentimes, it’s probably because of too much exposure – years of exposure – to harsh conditions and elements. Moisture and rain are on top of the list, because they can weaken materials.
It’s also important to consider the following possible causes:
- Corroded metal
- Age and normal wear
- Loose flashing
- Poorly installed flashing
- Failed fasteners
- Previous chimney and roof work
- Deteriorated sealant
- Deteriorating masonry
- Movement between the chimney and the roof
If you’ve had your roof replaced, make sure that your chimney flashing was integrated into the new roofing materials properly; otherwise, you may have to find a chimney professional who can help you fix the situation.
Again, the area where you find the stain is not necessarily the water’s entry point. So it’s important to check the whole area to understand the problem and find a solution for it.
Is It Okay to Inspect Chimney Flashing On Your Own?
Taking a look at and examine the situation of your chimney flashing is a good thing, especially if you’ve noticed something unusual for quite some time. You can observe from the ground or from inside your home, depending on which area best allows you to spot the signs of damaged chimney flashing.
Likewise, you can choose to stay inside your attic and your home to try to determine if there are signs of water damage. However, this doesn’t mean that you can go up on your roof to investigate and find out if there is a chimney flashing leak. Aside from you not being professionally equipped to do the whole job, you’re going to put yourself in danger, as roofs are often not only slippery but also quite complicated to manage.
Additionally, chimneys aren’t easy and safe to access and navigate, especially if you do not have proper training. While the flashing may be accessible, all the other elements of the system are quite difficult to reach since they may be behind counterflashing or tucked underneath the roofing materials.
So while you can determine if there’s something wrong with your chimney flashing, finding out what caused the leaking or damage is an entirely different matter.
How Do You Repair Damaged Chimney Flashing?
As in most situations, there is no one-size-fits-all solution for damaged chimney flashing. The right one is dependent on what the problem is. For example, if the problem is mainly a failed seal and the flashing is in good condition, only a professional chimney specialist can fix the issue.
In more complicated cases, such as when some parts of the flashing were not properly installed or are corroded, loose, or bent, a more extensive investigation and repair may be needed. Masonry may also need a vapor-permeable water repellent to reduce moisture retention. Professionals may also use polysiloxane waterproofing agents to help prevent future leaks. Some situations even require chimney flashing replacement as a more permanent and comprehensive solution through a careful chimney repair process.
Aside from the seal, it helps to also consider the surrounding roof, especially since roofing materials and flashing are expected to work together harmoniously. So it’s important to address the problem for both flashing and roofing materials. Addressing only one and not the other can lead to a possible water leak. Thus, use a sealant to cover damaged chimney flashing. Sealants must never be used to substitute for a fully functional and well-installed flashing.
If you cannot determine the cause of the fireplace water leak, try to check where the water entered and then call a chimney specialist.
When to Call a Chimney Professional
There are instances when it is best to immediately get in touch with a chimney professional rather than wait until you’ve examined the flashing.
A recurring fireplace water leak, significant presence of moisture and stains, and obvious chimney or roof damage are only some of the situations where professional help is needed.
Below are other situations where getting in touch with a chimney professional is a priority:
- The wall or ceiling around the fireplace is significantly stained.
- There is damage in the attic.
- Water has slowly entered your home.
- The flashing is either missing or corroded.
- Your roof is not easy to access.
- You’re not sure if your chimney roof is the cause of the flashing problem.
- You’ve had your system repaired but the leak hasn’t stopped.
Getting help from a professional chimney inspector is important because it does not only allow you to have your flashing checked by a trained and expeirenced specialist, but it’s also an opportunity to have your masonry, roof, chimney, and other water intrusion sources inspected. A chimney professional may also use a careful garden hose test on small sections to discover where water is entering and whether damaged flashing is responsible. A Masonry Absorption Test can also help identify the leak source.
For example, you can contact TOR Chimney if you’re trying to determine what’s wrong with your fireplace and chimney. Your purpose for calling for professional help is not only for flashing repair but also for you to understand what’s happening to your system – its current situation, what the leaking problem signifies, and what the possible cause or causes may be. If you notice ongoing signs of moisture, don’t just watch and wait—schedule an inspection.
Lastly, talking with a chimney specialist will prevent you from assuming that what’s happening to your fireplace or chimney is caused by chimney flashing.
Have the Rest of the Chimney Checked
If there is a fireplace water leak in your system, do not focus only on chimney flashing because there are other elements that can also cause such an issue. Flashing is just one of the possible causes.
For example, the chimney crown may have cracks, which means water can easily get inside. Other possible causes include porous masonry, a missing or damaged chimney cap, and deteriorating mortar joints.
A problematic roof can also have similar signs of a chimney flashing leak. This is why it’s important to always work with a professional chimney specialist. Only a trained and experienced professional can properly determine the source of the leak – it can be beside or above the fireplace, or somewhere else.
Examining your entire chimney and roof system, especially with the help of a chimney professional, can help identify where the water entered.
Find and Fix the Source of the Problem to Prevent Future Leaks, Not Just the Stain
When water seeps into your home and gathers around your fireplace, you can’t just assume where it came from. In such cases, the source is not easily visible. So it’s important to find time to examine the situation and properly determine the cause – as well as the solution.
The primary role of chimney flashing is to protect your system from rainwater by creating a barrier around the vulnerable point – the junction – or the area where the roof and the chimney meet. A deteriorated or damaged flashing can possibly cause a fireplace water leak, and eventually lead to water damage if left unattended.
In some cases, though, flashing may not be the main culprit – it can be your roofing materials, the chimney crown, chimney cap, masonry, or an altogether different component.
So if you believe or have observed recurring water stains, a fireplace water leak, signs pointing to a chimney flashing leak, or dampness, pay attention to all the evidence and get in touch with an experienced chimney professional. Finding and fixing the water stain is just one part of the problem; you also have to figure out its cause or source and a long-term solution for it. This is something that licensed chimney professionals, such as the team at TOR Chimney, can help you with. Get in touch with them the minute you realize that your fireplace and chimney are in danger. They’re always ready and prepared to discuss your concerns with you and help you determine what the next step should be.
