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Veteran's Memorial Auditorium, Des Moines, Iowa

Located in Des Moines, Iowa, the Veteran's Memorial Auditorium honors the World War II veterans of Polk County. When the auditorium's roof needed renovation, a long-term solution was proposed. As a result, Des Moines-based Academy Roofing and Sheet Metal Co. installed a 24-gauge 238T/FiberTite Hybrid roof system in Slate Grey from Architectural Building Components, Houston.

The 85,000-square-foot facility recently experienced a roof failure due to a poorly installed single ply membrane so a renovation and retrofit was needed. There were a number of issues that made the job a challenge. First the eave height was 70 feet, the roof pitch was 4:12 and the length of the roof sheets was going to be 120 feet from the ridge down to a 15-foot-wide trough at the bottom. The trough was going to be covered with single ply membrane. On top of that, the underlying structure consisted of a 3-inch-thick gyp plank deck attached to an I beam joist spaced 8 feet on-center.

Terry Wolfe of Force Engineering & Testing, Humble, Texas, was brought into the project to assist in the development of an engineered framing plan that provided attachment to the existing structure while meeting both the wind load and snow load requirements of the roof. Wolfe designed a framing grid system consisting of 4-inch-tall by 14- and 16-gauge zee purlins running up hill and Architectural Building Component's 1 3/4-inch-tall by 16-gauge zee purlins running across that attach to the structure below. The airspace between the two roofs would be filled with batt insulation.

Limited access from one side of the building further complicated the job, so Academy Roofing & Sheet Metal erected a 70-foot-tall scaffold to hold ABC's 238T Archzilla roll former that ran the 120-foot-long continuous length panels onto the roof. Panels were run and stacked on one side and then had to be carried across to the other side of the building. The new 238T roof system was installed using 100 percent continuous clips. The continuous clips provided for a wind uplift resistance that was at least three times the requirements and also significantly increased the load carrying capacity of the panels. At the eave, the roof panels were fixed and a flap of FiberTite XT single ply from Seaman Corp., Wooster, Ohio, was inserted. Despite the challenges of the job, all parties worked together seamlessly to provide the best watertight solution for Polk County.

OPN Architects, Cedar Rapids, Iowa, served as the project architect and The Weitz Co., Des Moines, served as the general contractor.

Architectural Building Components,

Seaman Corp.,