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  • Writer's pictureEllyse Trethric

4 Common Causes of Masonry Chimney Failures

As a home inspector at True Trust Inspections, I have had the privilege of inspecting numerous homes in Western North Carolina, where chimneys are a common feature. Chimneys add charm and warmth to our homes, but they also require regular maintenance to ensure their safety and functionality. During my inspections, I have come across several issues that can lead to masonry chimney failures. In this article, I will discuss four common causes that every homeowner in this region should be aware of.


Water Damage:

One of the primary culprits behind masonry chimney failures is water damage. In Western North Carolina, we experience a significant amount of precipitation, including rain and snow. Over time, the repeated exposure to moisture can lead to serious deterioration of the chimney structure. The freeze-thaw cycle can cause the bricks and mortar to crack, spall, and weaken, resulting in structural instability. Additionally, water penetration can lead to internal damage, such as rusting metal components and deteriorated chimney liners. To prevent water damage, it is essential to regularly inspect and maintain the chimney's flashing, crown, cap, and chimney chase cover, ensuring they are in good condition and properly sealed.


Lack of Proper Maintenance:

Like any other part of your home, masonry chimneys require routine maintenance to stay in good working condition. Neglecting regular inspections and cleaning can lead to various problems that may ultimately cause chimney failure. Creosote buildup is a significant concern, as it can ignite and cause chimney fires. A blocked flue due to debris, nests, or animal intrusion can hinder proper ventilation, leading to poor draft and potential carbon monoxide poisoning. To mitigate these risks, it is vital to have your chimney professionally cleaned and inspected at least once a year, especially before the winter season when you'll likely be using it the most.


Improper Chimney Construction:

Many masonry chimney failures can be attributed to inadequate construction or poor workmanship during installation. Chimneys that are not built according to proper codes and guidelines are more prone to problems. Insufficient chimney height, incorrect flue sizing, improper footing, and inadequate reinforcement are just a few examples of construction-related issues that can compromise the structural integrity of the chimney. When purchasing a home, it is crucial to hire a reputable home inspector to assess the chimney's construction quality and identify any potential red flags.


Lack of Chimney Liner:

A chimney liner serves as a protective barrier between the masonry and the byproducts of combustion. It plays a vital role in preventing heat transfer to combustible materials, reducing condensation and moisture penetration, and enhancing overall chimney performance. In older homes, it is not uncommon to find chimneys without proper liners or with damaged and deteriorated ones. Without a functional liner, the risk of chimney fires, carbon monoxide leaks, and structural damage significantly increases. If your chimney lacks a liner or has a damaged one, it is essential to have it inspected by a professional and consider installing a new, appropriate liner for safety and efficiency.


A masonry chimney failure can have serious consequences, from property damage to potential health risks. By understanding and addressing the four common causes discussed above—water damage, lack of proper maintenance, improper chimney construction, and lack of a chimney liner—you can significantly reduce the risk of chimney failure and ensure the safety and longevity of your chimney system.

As a female home inspector at True Trust Inspections, I'm dedicated to helping homeowners in Western North Carolina make informed decisions about their homes.


Remember, when it comes to chimney maintenance, prevention is key. Schedule regular inspections, invest in necessary repairs, and prioritize ongoing maintenance to enjoy the warmth and

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