Glass Magazine Awards 2016: Glass Reimagined

Glass Magazine Award winners create, handle and use glass in bold new ways
Bethany Stough
July 3, 2016

Most Innovative Curtain Wall Project: Public

U.S. Bank Stadium, Home of the Minnesota Vikings, Egan Co./InterClad

Photo courtesy of Egan Co.

The U.S. Bank Stadium, home of the Minnesota Vikings, is Minnesota’s largest construction project in state history. For the $1 billion stadium project, Egan Co.’s InterClad team installed approximately 200,000 square feet of glass, fabricated by Viracon set in a fully prefabricated 10 ½-inch deep custom curtain wall system—1600 Wall System—engineered by Kawneer Co.

Officials at InterClad note the project’s challenges due to a high percentage of unique geometry. “In order to have curtain wall and nearly 5,260 pieces of glass delivered to work areas that were difficult to access, [we fabricated] custom gantries to set the glass, and complex rigging equipment was needed to deliver curtain wall to the installation crews,” according to Deb Linquist, senior project manager, InterClad.

The project comprised 12 different walls, each unique by either the shape, slope (inward or outward), or height. Viracon supplied unique insulating glass units for each area, each utilizing its VRE1-59 insulating glass. The sloped-out glass is comprised of ¼-inch clear, 0.060-inch clear PVB interlayer, ¼-inch clear VRE1-59 on the No. 4 surface, ½-inch Argon-filled airspace and ¼-inch clear. The sloped-in glass units utilize ¼-inch clear VRE1-59 on the No. 2 surface, ½-inch Argon-filled airspace, ¼-inch clear, 0.060-inch clear PVB interlayer and ¼-inch clear.

The aluminum curtain wall system features a pressure plate system, with a back member of varying depths designed for wind loading. Once framing was set, InterClad put the glass up against the back gaskets and preloaded the pressure plate with gasket. The pressure plate attached with bolts to the back member, and the bolts were torqued to a certain inch/pounds to keep air and water out, according to InterClad officials.

The largest curtain wall is 358 feet wide by 238 feet tall, with 1,970 pieces of glass. This wall included five, 50 foot by 95 foot curtain wall-clad operable doors, some weighing more than 50,000 pounds, manufactured by Industrial Door Contractors Inc. The glass units on the large walls and in the operable doors are comprised of 5/16-inch clear VRE1-59 on the No. 2 surface, with ½-inch Argon-filled airspace. Each of these operable doors has ten (50 total) regular-sized 350 Tuffline doors manufactured by Kawneer that can be used to enter and exit the stadium.

HKS Inc. and Studio Five Architects Inc., designed the stadium. M.A. Mortenson Co., served as the general contractor.

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Stough is managing editor for Glass Magazine, and e-glass weekly. Write her at