Chimneys can leak for a variety of reasons. And once it starts leaking, it can lead to a multitude of other problems. Knowing the root cause of the issue can help you make a better repair decision, so let’s start with the most common causes.

3 Reasons Your Chimney Is Leaking

Reason #1: Flashing Issue – Common Cause of Chimney Leaks

One of the most common repairs with chimneys is from flashing issues. The flashing is the material, usually aluminum, that surrounds the part of the chimney from your rooftop. This metal part of the chimney is meant to form a waterproof seal between your roof and chimney. This is susceptible to leaking because flashing is difficult to install and flashing is also prone to rust, which can cause a leak over time.

Reason #2: Deteriorating Mortar – Causes Leaks in Chimney Systems

The mortar is what cements the masonry and holds it together — and it doesn’t last longer than 25 years (meanwhile the stones can last for centuries). When the mortar begins to deteriorate, moisture can pour into the chimney structure. And if the mortar isn’t replaced, the chimney can lean or collapse.

Reason #3: No Chimney Cap – A Key Component to Prevent Leaks

This part is not necessarily required when a chimney is installed, however, its a very important feature. The chimney cap prevents rain from pouring into your chimney and causing various moisture issues.

Prevent Leaks with Professional Chimney Inspections

Just these three reasons alone are three reasons why you should schedule annual chimney and roof inspection. Professionals can help you prevent any issues and find any repairs before they become bigger issues.

FREE Estimates On All New Roof Installations. Contact JM Roofing Today!

FAQ About Chimney Leak Causes

Is it common for chimneys to leak?

Yes, chimney leaks are a common issue for many homeowners. Over time, various parts of the chimney, such as the flashing, mortar, and chimney crown, can deteriorate or become damaged, leading to leaks. Regular chimney inspections help catch these issues early and prevent significant water damage.

How do you fix a leaking chimney?

To fix a leaking chimney, the cause of the leak must be identified first. Common fixes include repairing or replacing the flashing, replacing deteriorating mortar, installing or repairing a chimney cap, and sealing cracks in the chimney crown. It’s best to call a professional chimney repair service for an accurate assessment and repairs.

Are chimney leaks covered by homeowners insurance?

Chimney leaks may be covered by homeowners insurance, depending on the cause of the leak and the policy. If the leak is caused by a covered peril, such as a storm or fire, insurance might help cover the repair costs. However, issues caused by wear and tear, like deteriorating mortar or cracks, are usually not covered.

How much does it cost to fix a leak around a chimney?

The cost to fix a chimney leak depends on the extent of the damage and the cause of the leak. On average, repairing a leaking chimney can cost between $200 and $2,000. This includes services such as repairing flashing, replacing mortar, or installing a new chimney cap, depending on the severity of the issue.

How much does a leaking chimney cost?

A leaking chimney can cost anywhere from a few hundred to a few thousand dollars to repair, depending on the nature of the leak. Minor repairs, such as sealing a crack or installing a chimney cap, can be relatively inexpensive, while major structural repairs, like replacing the chimney crown or fixing damaged brickwork, can be more costly.

Who do you call to fix a leaking chimney?

To fix a leaking chimney, it’s best to call a professional chimney repair service or a certified chimney sweep. These experts are trained to identify the source of the leak and provide the necessary repairs, whether it’s replacing mortar, fixing flashing, or repairing the chimney crown.

Is it normal for rain to drip down a chimney?

No, it is not normal for rain to drip down a chimney. If water is entering the chimney, it indicates a potential problem, such as a damaged chimney crown, faulty flashing, or missing chimney cap. This can lead to water damage inside the chimney system and should be addressed promptly to prevent further issues.

Is flex seal good for chimneys?

While Flex Seal may temporarily seal small cracks in the chimney, it is not a long-term solution. Chimney systems require specialized materials, like high-temperature sealants, to effectively address leaks. It’s always best to consult a professional for proper chimney repair to ensure the longevity and safety of the chimney.

How do I find a leak in my chimney?

Finding a leak in your chimney can be tricky without a professional inspection. Look for common signs of water damage near the chimney, such as stains on the walls, dampness around the chimney, or cracks in the masonry. A professional chimney inspection can help locate the exact source of the leak, whether it’s from the flashing, crown, or another part of the chimney system.