
Roof curbs are essential components in various installation scenarios, including solar panel, HVAC, and rooftop equipment mounting. They provide a secure and stable base for equipment.
A roof curb's design and material selection largely depend on the installation type and environmental conditions. For instance, a roof curb for a solar panel installation in a coastal area may require a more durable material to withstand saltwater corrosion.
Roof curbs come in various shapes and sizes to accommodate different equipment and roof types. A standard roof curb can support a maximum weight of 200 pounds, while a heavy-duty curb can support up to 500 pounds.
In areas with high winds, a roof curb with a reinforced design is necessary to prevent equipment damage and ensure a secure installation.
Types of Roof Curb
Knockdown Curb is a type of rooftop curb that ships unassembled. This means you'll need to assemble it on-site, which can be a bit of a challenge.
Common types of roof curb include Knockdown Curb, which is a popular choice for many building projects.
Design and Installation
Roof curbs can be retrofitted to existing units or incorporated into new construction, making them a versatile solution for various roof types and styles.
A roof curb is a raised frame that provides shelter and stability for accessories that mount above the roof and penetrate through the surface of the roof, helping to keep workers and maintenance personnel safe during jobs.
Roof curbs need to be custom-fitted due to variations in roof pitch, roof styles, and roof manufacturer fabrication, which is why adjustable pitch roof curbs are a great option for accommodating different roof configurations.
These adjustable pitch roof curbs can be customized during installation to suit a roof pitched up to 1” in 12” in ANY direction, making them a convenient choice for many applications.
Understanding HVAC Systems
A roof curb is a raised frame attached to the roof of a building to support roof-mounted equipment like HVAC units.
Roof curbs can be retrofitted to existing units or incorporated into new construction.
They provide shelter and stability for accessories that mount above the roof and penetrate through the surface of the roof.
Roof curbs help workers and those performing maintenance to conduct their jobs safely and in line with OSHA standards.
Roof curbs for HVAC systems need to be custom-fitted due to variations in roof pitch, roof styles, and roof manufacturer fabrication.
A proper rooftop structure is important in keeping your facility in top working order and protecting the value of your company's biggest asset, your commercial building.
Roof curbs are vital in keeping your roof and building safe and damage-free.
Knockdown Defined
A Knockdown Curb is your least expensive option when it comes to rooftop curbs.
This type of curb ships unassembled, which makes it easy to store in your inventory. It's a great choice for contractors who need to transport multiple curbs to different job sites.
A Knockdown Curb is designed to be shipped knockdown, which means it's broken down into smaller pieces. This makes it much easier to transport and store, and it's often the most cost-effective option.
With a Knockdown Curb, you'll need to use some basic tools to assemble it on-site. This can save you time and money compared to installing a pre-assembled curb.
Adjustable Pitch Guide

Adjustable pitch roof curbs are a variation of knockdown curbs that can be customized during installation to suit a roof pitched up to 1” in 12” in any direction.
They offer job-site flexibility and are less expensive than fixed welded pitch curbs. This makes them a great option for many projects.
To ensure a proper fit, roof curbs for HVAC systems need to be custom-fitted due to variations in roof pitch, roof styles, and roof manufacturer fabrication. This is especially important for roof-mounted equipment and features.
Measuring the pitch of a roof is a simple process, but it does require the right tools, such as a level, tape measure, and a keen eye for detail. A level at least 12 inches in length is a must-have for accurate measurements.
Adjustable pitch roof curbs can be retrofitted to existing units or incorporated into new construction, providing shelter and stability for accessories that mount above the roof and penetrate through the surface of the roof.
Vibration Isolation
Vibration isolation is a crucial aspect of designing and installing roof top mounted HVAC units (RTUs). It helps reduce noise generation and transmission into the building.
Some roof curbs provide a function of vibration isolation, which can be especially beneficial in areas with high noise sensitivity. This is achieved through the use of specialized materials and designs.
You can achieve vibration isolation by using roof curbs that are designed specifically for this purpose. These curbs can be used in conjunction with RTUs to minimize noise pollution.
Here are some key benefits of vibration isolation roof curbs:
It's worth noting that not all roof curbs provide vibration isolation. Some may only serve as a structural support for the RTU.
Your Professionals
We've got you covered with our team of experts. All of our aluminum curbs include a 20-Year Warranty.
We offer a wide range of roof curbs for various applications, including HVAC, roof fans, gravity vents, skylights, equipment access, and other rooftop equipment.
Our professionals can help you design and install roof curbs that meet your specific needs, providing a safe and secure solution for your roof equipment.
Frequently Asked Questions
How tall is a typical roof curb?
A typical roof curb should be at least 200 mm (8 in.) above the finished roof.
What are RTU curbs?
RTU curbs are mounting devices specifically designed for rooftop installations of heavy commercial-grade air conditioning units. They provide a secure and stable base for efficient air conditioning of large spaces.
What is a roof hatch curb?
A roof hatch curb is a raised metal frame that provides a secure and level platform for mounting roof hatches and other accessories to your roof. Proper installation of a roof hatch curb ensures safe and stable attachment of roof hatches and other equipment.
Featured Images: pexels.com