Rtu Roof Curb Selection and Installation for Rooftop Units

Choosing the right roof curb for your rooftop unit (RTU) is crucial for a successful installation. The curb must be compatible with the unit's size and type.

A roof curb is a structural component that supports the weight of the RTU and provides a seal between the unit and the roof. It's typically made of metal or fiberglass.

When selecting a roof curb, consider the unit's weight and size, as well as the roof's material and slope. The curb must be designed to handle the unit's weight and withstand various weather conditions.

Proper installation of the roof curb is essential to ensure a leak-free and safe system. This involves ensuring the curb is securely fastened to the roof and the unit is properly seated on the curb.

A roof curb is a metal structure installed on a building's roof before an HVAC Rooftop Unit (RTU) is placed on it.

The roof curb separates the roofing material from the hole cut in the roof for the RTU.

To install a commercial-grade air conditioner, you'll need to purchase a roof curb.

The curb provides a base for the RTU to sit on, and it's where you'll connect the ductwork to allow cool air to flow into the building.

A roof curb adapter is a crucial component for mounting rooftop HVAC units (RTUs) on existing roof curbs. It's used to attach the RTU to the building structure.

The adapter curb provides four main functions: attaching the RTU to the building structure, directing air flow, sealing openings in the roof, and sometimes providing vibration isolation to reduce noise generation and transmission.

Roof curb adapters are designed to be an integral part of the roofing system, but they're not meant to replace the original curb. The service life of the roofing system doesn't usually coincide with the service life of the RTU, so an adapter curb is used when the RTU needs to be replaced.

A well-fabricated curb is essential to the structural integrity of the whole system. Working with a fabricator who specializes in duct work and welding ensures a curb that's made to exact specifications.

Here are some key features of roof curb adapters:

The installation process for an RTU roof curb is a crucial step in ensuring efficient and reliable HVAC performance. A sturdy curb is vital for safety and longevity.

The curb acts as the structural foundation that supports the rooftop unit and aligns it securely with the building's ventilation and electrical systems. This is why it's essential to install the curb first.

To install the curb, you need to determine its placement and prepare the roof accordingly. This involves cutting the roof opening to the correct size.

The curb must be positioned and secured to the roof, ensuring it's level and stable. Weatherproofing the curb is also crucial to prevent moisture issues.

After installing the curb, you're ready to install the RTU. This step requires precision and attention to safety, as RTUs are heavy and require proper handling.

Here are the key steps to follow for a successful installation:

By following these steps, you can complete a professional RTU and curb installation that provides efficient, reliable HVAC performance for years to come.

To minimize the likelihood of change orders or time and materials billing, it's essential to schedule your RTU curb installation services immediately after the slab is poured or demo has been completed.

MFAB recommends this approach because it allows them to install RTU curbs within the joists before any ground or air obstacles are introduced to the job site.

MFAB will charge time and materials at their current rate or submit a change order if the actual on-site conditions differ from their assumptions, so it's crucial to plan ahead and avoid any unexpected surprises.

Site Conditions and Estimation are crucial for accurate pricing and efficient installation of RTU curbs. Clearing the jobsite of obstacles is essential, with no electrical, plumbing, drop ceilings, steel stud framing, or HVAC equipment/ducting hindering access.

MFAB recommends scheduling their services immediately after the slab is poured or demo has been completed and before other trades access the space. This allows them to install RTU curbs within the joists before any ground or air obstacles are introduced to the job site.

To avoid change orders or T&M billing, it's best to ensure the locations where RTU curbs are to be installed is accessible with a scissor lift. MFAB does not install RTU curbs off ladders for the safety of their employees.

If you wish to provide a lift, it must be on-site when MFAB arrives to perform the work and must be available for MFAB's use throughout the entire duration of their presence on-site. Sharing the scissor lift with other trades slows them down and adds more costs to the project.

To facilitate accurate installation, locations and inner dimensions of all curbs should be marked on the underside of the roof decking with highly visible spray paint or a permanent marker. This layout style precisely indicates curb locations and internal dimensions.

Here are the key assumptions made by MFAB for accurate pricing and estimation:

Having the right documents and media can make a huge difference in the preparation and planning phase.

You'll want to start by gathering essential documents, such as the Plenums Standard Roof Curb List. This will give you a clear understanding of the available options.

Make sure to also download the Knockdown Curb Assembly Instructions, which will guide you through the installation process.

Having a list of Unitary Packaged Units with Accessories Available will help you plan and prepare for the installation of your packaged units.

To help you get started, here's a list of some of the key documents and media you'll need: