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Manufacturer and supplier of roof products and accessories for the metal building industry since 1964
Conventional / Built-up Roof Curb
Our conventional / built-up roof curbs feature full penetration continuous welds at all seams. We fabricate the curbs with a 3″ perimeter flat flange around the base of the curb, in addition to a 1.5″ x 1.5″ treated wood nailer to accept roofing material. Curb walls are finished with 1″ rigid insulation and may be fitted with an interior white liner. Additionally, higher R-Value insulation is available. We provide scaled CAD drawings with all orders.
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Self Flashing Steel Built Up Curb -
Self Flashing Steel Built Up Curb -
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Features
- Perfect for wood or metal decking surface
- Steel construction w/ 1.5"x1.5" wood nailer
- Full-penetration continuous welds
- 1" rigid insulation in curb walls (R7.2)
- Partitoned duct hangers/shelves/panels for HVAC or Fan equipment
- Description
- Model Guide
- Sizes and Weights
- Documents
- FAQ
- R&S Insights
Specifications
| Material | 18 GA, 14 GA or 16 GA aluminized steel 1″ Rigid Insulation R7.2 (higher R-Values available) |
| Construction | Full penetration welds, thoroughly tested Mitered corners for true square top |
| Curb Base Flange | 3″ perimeter base flange Custom base flange available |
| Curb Top | Level top when specified Skylight curbs slope with roof 1.5″x1.5″ treated wood nailer |
| Dimensions | 12″ height typical 1.5″ top flange 3″ perimeter base flange |
| Finish | Galvanized steel mill finish |
| Certifications | Engineering calcs (additional costs apply) |
| Warranty | 1 Year |
Options
| Curb Liner | Conceals insulation, mill or white finish, complete kit for install |
| Ridge Mount | Installs on ridge condition, double pitched |
| Collar Top | Square-to-round transition |
| Non-Insulated | Cost savings when insulation not required |
| High R-Value |
2″ thick insulation for R14 value |
| Damper Shelf | Damper support for exhaust fan |
| Duct Supports | Insulated blank-offs, duct supports for HVAC equipment |
Curb Model Guide
| Model | L x W x H | Side Flanges | Closures/ Caps |
Curb Top |
Insulation | Gauge | Material | Finish | Options (add all that apply) |
| CBM: Conventional Built-up or Membrane Roof |
R: Flat Flange | NA | L: Level
S: Slope w/ Roof |
Y: Insulated
X: Not Insulated |
14
16 18 |
B: Steel
C: Stainless Steel |
NA | CL: Curb Liner
RM: Ridge Mount CT: Collar Top |
Example
CBM-48x96x12-T1SY-080″AM-CL
Terminology
Flat Side Flanges (R): flat side flanges 3″ typical
Ridge Mount (RM): Inner weight-bearing curb and outer flashing curb (heavy equipment)
Curb Liner (CL): white or mill finish liner on inside of curb wall; conceals insulationFloating
Collar-Top (CT): square-to-round transition for pipe penetrations
All curbs custom-sized to meet project specifications.
Conventional Roof Curbs FAQ
What are conventional roof curbs?
Conventional roof curbs are raised metal platforms that offer support and weatherproofing, distributing the weight of rooftop equipment like HVAC units, exhaust fans, and skylights, and preventing damage to the roof membrane.
Can you list a couple types of conventional roof curbs?
Types of conventional roof curbs also called built-up roof curbs include Non-Ventilated Curbs for general equipment support, Ventilated Curbs with airflow vents, Curbs with Curbsticks for added stability, and Custom Curbs designed for specific needs and equipment dimensions.
What are built-up roof curbs made of?
Built-up roof curbs are most commonly made of galvanized steel for durability and weather resistance, but can also be made from aluminum or stainless steel for specific applications.
What are the benefits of conventional curbs?
The main benefits include enhanced weatherproofing, structural support for rooftop equipment, and simplified equipment installation. Conventional roof curbs provide a ready platform for mounting, streamlining the installation process and saving time and construction costs.
What are the advantages of using a custom roof curb?
Custom roof curbs offer a perfect fit for unique equipment and complex roof configurations, ensuring optimal performance and aesthetics.
R&S Insights Blog
What Are Some Uses for Rooftop Curbs?
Roof curbs are used extensively on commercial roofs to ensure the safe installation and proper functioning of various components of the roof system, such as HVAC equipment, and more… Learn More
What Are HVAC Roof Curbs and What Are They Made Of?
Commercial buildings often have at least one or a combination of these items on the roof: fans, condensers, skylights, hatches, vents, or AC units… Learn More
Check out our Product Line Card
R&S manufactures a vast array of products to fit your project needs. We aim to supply all of your metal building roof accessory needs, not just one product. Why go to multiple vendors when R&S can supply it all?
