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Three-Tier Tutelage

Mcn  Editors Pick  Jun17 4 Low Rez

Elementary school earns good grades with three-tier roof

The expansive, new 500-student, pre-K through fourth-grade Heritage Elementary School in Tahlequah, Okla., was greatly needed by its growing community. The project, designed by Crafton Tull Architects in Tulsa, Okla., features a curving spine element that provides the main circulation corridor off of which three major classroom "fingers" radiate.

A defining entry area of the 70,000-squarefoot structure honors Tahlequah's Cherokee Indian history with a representation of the Cherokee sacred fire, a symbol of the culture's unity and strength. Enrollment at Tahlequah Public Schools includes approximately 44 percent Native American students.


Sprawling Structure

According to Crafton Tull Architects, the structural system for the classroom wings consists of metal roof trusses, steel beams and exposed cantilevered concrete columns. The truss system was supplied by Sooner Steel & Truss, Oklahoma City. The remainder of the projects consists of structural steel framing, precast panels and glue-laminated wood, which were also utilized at the entry tower element of the building.

Nearly 87,000 square feet of Elk Grove Village, Ill.-based Petersen Aluminum Corp.'s 24-gauge PAC-CLAD Galvalume Snap-Clad metal roof panels were selected to cover the sprawling structure. The innovative roof design on each classroom wing features three different levels that minimize mass and offer a sleek look. The Snap-Clad panel profile was specified as an option by the architect, says Jason Irvin, branch manager of Harness Roofing, Tulsa, the installing contractor.

"The detailing was complicated and required custom-tapered valleys and transitions from each level of the wings," Irvin says. "[We] worked with the architect and Petersen on designing valleys at transition levels. Getting the levels to line up properly was definitely a challenge. But other than that, the job was relatively straight-forward. There was just a lot of it!"

Irvin and his coworkers attended weekly meetings with the general contractor and architect to discuss progress and adjust details as the project progressed. "[We] designed and fabricated custom gutters due to increased size of gutters," he says. Many of the Snap-Clad panels were up to 60 feet long and were fabricated on-site using Petersen's portable roll-forming equipment provided from its Tyler, Texas, plant. "The longer panels were lifted onto the roof using a crane and spreader bar," Irvin says. "The shorter panels were manufactured in Tyler, crated and shipped to us."

Sidebar: Heritage Elementary School, Tahlequah, Okla.

Owner: Tahlequah Public Schools
Architect: Crafton Tull Architects, Tulsa, Okla.,
General contractor: Nabholz Corp., Tulsa,
Installing contractor: Harness Roofing, Tulsa,
Distributor: Bradco Supply, Tulsa,
Metal roof panels/rollformer: Petersen Aluminum Corp., Elk Grove Village, Ill.,
Truss system: Sooner Steel & Truss, Oklahoma City,