The steel chord that joins the two sides of the roof consists of approximately 12 pieces of steel, which are 50 feet long and weigh 60,000 pounds. More than 30 pieces of the final roof steel will complete the roof ridge structure in the next month.
Sixty percent, or more than 245,000 square feet of the new stadium’s roof will be made up of the light-weight panels. The ETFE installation is scheduled to be complete this fall.
The storm water system utilizes 1,040 linear feet of 12-foot diameter perforated corrugated metal pipe surrounded by stones. The storm water system will return filtered water back into the watershed rather than sending it into the city’s storm water system. The total system treats 21.4 acres with a system volume of 1,133,579 gallons.
“Meeting these major milestones is a direct result of the leadership of Mortenson Construction and the hard work by Minnesota construction workers and Minnesota businesses,” Minnesota Sports Facilities chair Michele Kelm-Helgen said in a release. “We look forward to meeting additional milestones that will keep the project on time for our 2016 opening.”
The stadium is scheduled for opening in July 2016, with a Super Bowl and NCAA Final Four tournament already booked in the coming years.
In addition, the “topping out” of the concrete this week marks the completion of the structural concrete in the new stadium. More than 1,200 construction workers, executives and staff from Mortenson, Thor Construction, HKS, Inc, the Minnesota Sports Facilities Authority and the Minnesota Vikings celebrated with a lunch on Thursday. Overall, 10,000 concrete trucks delivered 100,000 cubic yards of concrete, which would fill more than 30 Olympic-sized swimming pools.
The highest point of concrete poured on the project is 289 feet, with 5.3 miles of columns poured.
The new stadium will have 65,000 seats, expandable to 72,000 for special events. The project is more than 50 percent complete with more than $420 million in work completed to date. The project peaked with 18 cranes on site in May, with the last tower crane to be dismantled next week, clearing the way for the building to be fully closed by November 2015.