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Stadium features warped surfaces

Photo: Joe Brennan, Phalanx StudiosMost of the surfaces are warped on U.S. Bank Stadium, home of the National Football League's Minnesota Vikings, in Minneapolis. HKS Inc. intended the design to evoke the city's founding influence of Nordic cultures in its craft, value, texture, detail, clean lines and functionality. HKS specified the stadium's pattern, texture and finishes to recognize the range of cultures and nationalities in the Twin Cities region.

The project's construction process was based on a digital model, and each sub-panel had a layout and design procured off-site. MG McGrath Inc. (MG McGrath Architectural Surfaces) supplied and installed metal panels and framing on the exterior and interior of the stadium. It installed approximately 2,000 unitized sub-panels with framing and insulation and 350,000 square feet of Umicore Building Products USA Inc.'s 1-mm ANTHRA-ZINC Interlocking panels on the roof and exterior walls.

In the interior, MG McGrath Architectural Surfaces fabricated and installed custom finished metal components for the concourses, suites, locker rooms, concession stands and bars.

HKS designed U.S. Bank Stadium to balance protection from the elements with a connection to the outdoors. It has an asymmetrical, angular roof to shed snow and a steeper roof plane on the north of the building than the south, which receives more sun. There is also a snow catch basin.

The fixed roof was built with transparent ethylene-tetraflouroethylene (ETFE). The combination of the transparent roof and approximately 200,000 square feet of glass throughout the climate-controlled building was designed to give occupants a sense of the outdoors. Operable doors provide views of the skyline and surrounding plazas.

Additionally, MG McGrath Architectural Surfaces fabricated and installed "The Horn" monument on Medtronic Plaza outside the stadium, which has intertwined steel ribbons, lights, paint and a mirrored finish. Minnesota Architectural Alliance Inc. (Alliiance) designed "The Horn" to resemble the Gjallarhorn, a horn from Norse mythology. Workers at MG McGrath Architectural Surfaces hand-crafted 38 tons of steel into 16 pieces for shipment to the job site, where each piece was lifted into place with cranes and welded together to construct the 25-foot-tall by 107-foot-long monument.

U.S. Bank Stadium has seven levels including two general admission concourses with 360-degree circulation and views into the bowl. It seats up to 65,400 fans and can be expanded for 72,000 people. The stadium houses 8,000 club seats, 116 suites, 430 concessions, restaurants, shops, museum and hall of fame. Ground was broken for the 1.75 million-square-foot project in December 2013 and it was completed in July 2016.

Owners: Minnesota Sports Facilities Authority and Minnesota Vikings, Minneapolis
Architect: HKS Inc., Los Angeles,
Monument designer: Minnesota Architectural Alliance Inc. (Alliiance), Minneapolis,
General contractor: M.A. Mortenson Co., Minneapolis,
Fabricator/installer: MG McGrath Inc. (MG McGrath Architectural Surfaces), Maplewood, Minn.,
Interior glass/glazing: MG McGrath Architectural Glass and Glazing, Maplewood,
Zinc: Umicore Building Products USA Inc., Raleigh, N.C.,