Instead of typical sliding technology, we turned to hydraulic pistons to create the largest pivoting doors in the world. The roof doesn’t open but a tinted glass end wall does, with five enormous operable panels that let in light, air and downtown views. For a stadium that’s 1.7 million square feet, that’s no small feat! This efficiency – in both structural design and energy-use offsets (100%) – contributed to the venue’s LEED Gold certification.
Panoramic views, abundant natural light, and solar heat gain (a bonus in winter) increase comfort, and fresh air circulates throughout – from the operable doors to louvers in the roof ridge opposite – to avoid excess heat. Part of a coordinated sustainability strategy, the see-through roof offers a better overall visitor experience. ETFE’s minimal weight allowed for a slender framing system – which creates an airy feel while reducing the stadium’s cost and carbon footprint.
At 240,000 square feet, it was the first ETFE roof in a northern climate and, when built, the largest ETFE roof in North America. On the south (sunny) side of the ridge, a transparent, ethylene tetrafluoroethylene (ETFE) system covers 60 percent of the stadium. This singular profile is supported by a single steel ridge truss running 970 feet down the length of the field. Bank Stadium’s steeply lofted roof to shed as much snow as possible. We will continue to work with the Audubon Society on operational enhancements that will help make the facility bird friendly.We used sophisticated parametric modeling to carefully configure U.S. We were able to adopt operational guidelines used by other downtown office and residential buildings, we were unable to change the design and do not have the budget to include the $1.1 million needed for bird safe glass. We have also taken into consideration the lighting design for the stadium, and where we are able, we will follow the Audubon’s suggestions. We have agreed to the Audubon Society’s operational approaches, including the “Lights Out” guidelines. We have met several times with the Audubon Society and worked with Mortenson and HKS to look at all options for design and operational solutions to minimize bird collisions.
“The ability to see in and out of the stadium was what led us to the design that included the ETFE roof and operable doors on the downtown facing wall.” “One of the design goals was to create a building that was more connected and integrated with the community than the Metrodome had been,” said Michele Kelm-Helgen, chair of the Minnesota Sports Facilities Authority. The design was also completed prior to changes in state guidelines related to bird-safe glass. The new stadium design and budget were completed prior to conversations with the Audubon Society. UPDATE: The Minnesota Sports Facilities Authority has also released a statement: We will continue to partner with the MSFA to enhance bird safety through the lighting design and operational guidelines. Stadium construction costs continue to rise, and unfortunately the budget does not include the additional cost required by the Audubon Society’s recommended glass. We are also discussing the Audubon’s various recommendations regarding the lighting design for the stadium. The Vikings and the MSFA have agreed to implement lighting operational procedures, when possible, to mitigate bird collisions during peak migratory periods.
We have met multiple times with representatives from the Audubon Society and, together with the MSFA and HKS, have been working collaboratively to address concerns regarding bird safety. UPDATE: The Vikings issued a statement to For the Win: We’re asking them to change their minds and do the right thing,” Audubon Minnesota Executive Director Matthew Anderson said in a press release. The Vikings recently approved spending millions and millions of additional dollars to make sure the stadium is ‘iconic’ – surely they also want to make sure it’s not a death trap. “Hundreds of millions of dollars of public money is going to build this stadium, and we know the people of Minnesota do not want their money killing birds. The problem comes from the type of glass and lighting that the stadium uses, according to the Audubon Society. The Audubon Society claimed that they met with the stadium developers as recently as April 2014. The Society claims that the Vikings ignored their advice on which glass to use in the stadium and as a result are risking the lives of thousands of birds. The new Minnesota Vikings stadium is definitely not one for the birds.Īctivists with the Audubon Society are calling for a change in the plans for the new stadium, which is scheduled to hold the Super Bowl in 2018. AP Photo/HKS Sports and Entertainment Group, File
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