The  reasons why roof curbs fail

Roof curbs are an essential component of any commercial or industrial roof system. They are installed on the rooftop to raise HVAC equipment, vents, and other utilities above the roof surface. The curb is designed to create a stable platform for these heavy appliances, protect the roof from damage caused by the equipment’s weight, and prevent water intrusion.

However, roof curbs are also vulnerable to failure due to various factors. In this article, we will explore the reasons why roof curbs fail and what can be done to prevent such failures.

Design flaws

One of the most common reasons for roof curb failure is the design flaw. Curbs that are not designed to support the weight of the equipment or are not properly installed can lead to premature failure. For instance, a curb that is too low or not built with the right materials can cause the equipment to sink or shift, leading to the development of leaks and other issues.

 Improper installation

Improper installation is another major cause of roof curb failure. If the curb is not installed correctly, it may shift or move, causing the equipment to become unstable. Additionally, improper installation can lead to gaps between the roof surface and the curb, allowing water to seep in and cause damage.

 Corrosion and rust

Roof curbs are typically made of metal and are exposed to harsh weather conditions. Over time, the curb may corrode or rust, weakening the structure and reducing its ability to support the equipment. If the rust or corrosion is severe, it may cause the curb to break, leading to a potential safety hazard.

Inadequate maintenance

Proper maintenance is crucial to the longevity of roof curbs. Failure to perform regular maintenance, such as cleaning and inspecting the curb, can lead to the accumulation of debris and other materials that can cause damage over time. Neglecting to maintain the curb can also cause small issues to develop into more significant problems, leading to costly repairs or even the need for a complete replacement.

 Environmental factors

Environmental factors such as wind, rain, snow, and hail can also contribute to roof curb failure. In areas with high winds or heavy snow loads, curbs may be subjected to significant stress, causing them to warp or break. Similarly, heavy rainfall can cause water to pool on the curb, leading to corrosion and rust.


Roof curbs, like any other building component, have a finite lifespan. As the curb ages, it may become weaker and more susceptible to failure. If the curb is not replaced in time, it may break or collapse, causing damage to the equipment or even the roof itself.

Preventing roof curb failure

To prevent roof curb failure, it is essential to ensure that the curb is designed, installed, and maintained correctly. Regular inspections should be conducted to check for signs of wear and tear, rust or corrosion, and any other issues that may compromise the curb’s integrity. Any problems should be addressed promptly to avoid more significant issues down the line.

Additionally, proper maintenance can help extend the curb’s lifespan and prevent premature failure. Regular cleaning and debris removal can prevent the accumulation of materials that can cause damage over time. Furthermore, applying coatings or sealants can help protect the curb from environmental factors such as rain and snow.

In conclusion,  tubular skylight are critical components of commercial and industrial roofs, and their failure can have serious consequences. Understanding the reasons for roof curb failure and taking steps to prevent such failures can help ensure that the equipment is safe and that the roof system remains intact for years to come.


Overloading is another common cause of roof curb failure. If the equipment placed on the curb exceeds its maximum weight capacity, the curb can bend or break, leading to significant damage. Additionally, overloading can cause the roof to sag, leading to water accumulation and other problems.

 Poor quality materials

Using poor-quality materials during the construction of the curb can also contribute to premature failure. Low-quality materials may be more susceptible to corrosion or rust, leading to the weakening of the structure. In contrast, high-quality materials can withstand harsh weather conditions and provide long-term durability.

 Lack of reinforcement

In some cases, the roof curb may require additional reinforcement to support the weight of the equipment. If the curb is not reinforced correctly, it may fail prematurely, leading to costly repairs or even the need for replacement.

 Installation of incompatible equipment

Installing equipment that is not compatible with the curb can also lead to failure. If the equipment is not properly secured to the curb or is too large for the curb’s dimensions, it can cause the curb to shift or become unstable. This can result in water infiltration and damage to the roof system.

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