ROOF CURBS
Welcome to MicroMetl’s Rooftop Curbs Resource Center
Selecting the right rooftop curb is a critical part of any RTU installation. From standard configurations to fully customized designs, curbs determine how well a rooftop unit integrates with the building, the ductwork, and the overall system performance.
With decades of experience manufacturing both standard and custom rooftop curbs, MicroMetl provides clear guidance on how to evaluate your options and make the best choice for your project—whether you’re addressing pitch, height, load support, or compatibility with existing ductwork.
Explore our articles to learn best practices, installation tips, and practical insights from real-world field experience.
Have a question or a specific curb challenge you’d like us to cover?
Send it our way—we may feature it in an upcoming blog post.
Adjustable Pitch Roof Curb – A Complete 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. There are many situations in which an adjustable pitch roof curb is preferable to a fixed pitch curb… Read Why!
How to Measure for a Curb Adapter
You’re on the roof to replace the Rooftop Unit (RTU). The unit nameplate is so worn you can’t decipher the model number, even yet the brand or manufacturer. It is never practical to break the integrity of the existing roof to remove the existing Curb. Therefore, you must measure the existing curb and order a Curb Adapter.
How To Calculate A Roof Pitch… And Measurement Improvisation
Measuring roof pitch is one of those tasks that looks simple—until you’re the one standing on the roof trying to make an accurate measurement through uneven shingles, irregular surfaces, and the wind blowing your tools around. Whether you’re ordering a pitched rooftop...
Knockdown Rooftop Curbs — Defined & Explained
Knockdown rooftop curbs are a cost-effective, flexible, and easy-to-store solution for rooftop HVAC installations. Designed to ship unassembled, they offer contractors a practical option when space, budget, and installation logistics matter. What Is a Knockdown Roof...
HVAC Burglar Bars – Do They Work And Where Do They Belong?
Innovative criminals will try anything to gain access into a building. So when conventional breaking and entry methods either fail, or appear too risky, burglars often attempt entry through Heating, Ventilation, and Air-Conditioning (HVAC) systems.
What Are Seismic Roof Curbs? — Understanding Purpose, Certification & Application
Seismic roof curbs are specialized structural support platforms engineered to maintain the integrity and functionality of rooftop HVAC equipment during significant seismic events. While the word “seismic” generally refers to earthquake activity, these curbs also help...
Are Welded Rooftop Curbs Worth The Additional Cost?
When selecting rooftop curbs for an installation or replacement project, contractors are often faced with the same question:“Is the extra cost of a welded curb really worth it?” The answer depends on jobsite conditions, timeline, and installation priorities. Let’s...
Common Rooftop Curb Types — Explained & Defined
When selecting the right rooftop curb for a new or replacement Rooftop Unit (RTU), you’re faced with a wide range of options. Each curb design exists for a specific purpose—structural, airflow, vibration control, wind resistance, or roof compatibility. Here is a...
HVAC – What Is An Adjustable Pitch Curb?
The Adjustable Pitch Curb is designed to pitch in any direction, and ships knockdown. It is less expensive than a fixed welded pitch curb, and offers job-site flexibility.
Choosing The Correct Seismic Roof Curb – Understanding The Specifications
Choosing The Correct Seismic Roof Curb – Understanding The Specifications A previous MicroMetl Blog defined Seismic Curbs. Now that we understand the definition of seismic roof curbs, how are they applied in the real world? It is…
