Roof Curb Systems Resource Library specifically for:

Looking for product details pertaining to our Roof Curb Systems? You are in the right place! On this page, we have organized our resources for you and your customers to better understand our solutions. If there is something you are not seeing, or have a question about a custom detail then do not hesitate to contact us as we are your partner for everything on and through the roof. DISCLAIMER: Due to the proprietary nature of Roof Curb Systems and our market strategy, the details and information contained on this page are not permitted to be distributed or shared with the traditional roof curb companies that exist in our industry.

The Flat-Flange Roof Curb System

Chief Buildings standard curb system style offered exclusively in Aluminum material except for Screw Down/R-Panel Roofs supporting equipment in excess of 1400 lbs. Here are the details: (PDFs will open in a new window for all links)

• Flat-Flange Single Curb: Designed to work with all Chief Roof Panels with custom formed loose Rib-caps & Closures for most rooftop equipment up to 1500 lbs.

• Flat-Flange Double Curb: Consisting of an inner structural curb built from 14 Ga. G-90 Steel and an outer floating curb mimicking the style of our Flat-Flange Single Curb with the addition of a Flash collar, the Double Curb version is intended to support heavier loads.

• Flat-Flange Single Curb for Screw Down/R-Panel Roofs: Similar to our Flat-Flange Single Curb except we add the ability to change the material to a 14 Ga. AZ55/Galvalume to support heavy loads like a Double Curb, but since these roof panels don’t float, neither do our curbs. This combination was recently adopted by Chief Buildings Standards Department to offer a more cost efficient option for heavy rooftop equipment on non-floating roof systems.

The curb itself is only a part of the Roof Curb System equation as it actually starts with a properly designed sub-framing system that we regard as “TRAC”. This patented system is built entirely from G-90 Steel material ranging from 12 Ga. to 16 Ga. depending on application with factory notched cross channels to correctly match the inside dimension of the curb for ease of installation. Here are the TRAC options adopted by Chief Buildings to complete the system specifically designed for each roof panel standoff height:

• Flat-Flange TRAC Rail Single Span: Connecting two roof framing members and designed to match the panel standoff of low-clip heights while allowing for thermal movement caused by roof panel expansion and contraction, this system is factory notched with saddles to match the purlin or joist spacing which must be provided for fabrication. This system does not accommodate field located beams for roof framing support.

• Flat-Flange TRAC Rail Double Span: Connecting three roof framing members and designed to match the panel standoff of low-clip heights while allowing for thermal movement caused by roof panel expansion and contraction, this system is factory notched with saddles to match the purlin or joist spacing which must be provided for fabrication. This system does not accommodate field located beams for roof framing support.

• Flat-Flange Cee-TRAC Single Span: Setup for high-clip roof panel standoff only (>1”), Cee-TRAC is the high-speed version of TRAC offering the most flexibility as it rides on top of the roof purlins, joists, or beams. The 82 inch long span channels connect two roof framing members via sliding plates that are fastened to the roof framing while allowing for thermal movement caused by roof panel expansion and contraction.

• Flat-Flange Cee-TRAC Telescopic: Setup for high-clip roof panel standoff only (>1”), Cee-TRAC is the high-speed version of TRAC offering the most flexibility as it rides on top of the roof purlins, joists, or beams. The telescopic span channels which reach out to 144 inches connect two roof framing members via sliding plates that are fastened to the roof framing while allowing for thermal movement caused by roof panel expansion and contraction.

• Flat-Flange Zero-TRAC Single Span: When using a screw-down or R-Panel roof, this is the sub-framing system to support the curb and connect to the roof panels for proper weather-tightness. Similar to TRAC Rail with factory notched span channels and stirrup locations based on roof framing dimensions, however there is only a material thickness between the roof panel and support to accommodate the fixed attachment style of the roof. This system which connects two roof framing members has been approved by Chief Standards to support rooftop equipment up to 1400 lbs. in most situations which eliminates any need for a framed opening.

• Flat-Flange Zero-TRAC Double Span: When using a screw-down or R-Panel roof, this is the sub-framing system to support the curb and connect to the roof panels for proper weather-tightness. Similar to TRAC Rail with factory notched span channels and stirrup locations based on roof framing dimensions, however there is only a material thickness between the roof panel and support to accommodate the fixed attachment style of the roof. This system which connects three roof framing members has been approved by Chief Standards to support rooftop equipment up to 1400 lbs. in most situations which eliminates any need for a framed opening.

Installing the Flat-Flange Roof Curb System is best demonstrated in the video tutorial produced by RCS that was captured on a Chief Building located in South Carolina and erected by J W Wilson Company in the summer of 2017.

The Seam-In Roof Curb System

This is the flashy Texas-style roof curb design for specific warranty requirements or special customer requests that comes exclusively in Aluminum material and is designed with side flanges that land on module with the roof panel high ribs in addition to having welded in Rib-caps and closures based on the panel high-rib spacing. Here are the details: (PDFs will open in a new window for all links)

• Seam-In Single Curb:

• Seam-In Double Curb: