State Farm Stadium is one of the most active multi-purpose facilities in the country with events scheduled most days of the year. The retractable grass playing field is a key factor in the facility’s quick conversions between events, including National Football League games, trade shows, monster truck rallies, and rock concerts.
State Farm Stadium
Retractable Playing Field
The field normally resides outdoors, on the south side of the facility where conditions for maintaining its natural grass playing surface are optimal. Inside the stadium, a clean, flat, well-positioned floor is exposed, ready for trade shows, concerts, and other events. On game days, the grass field is driven approximately 500 feet into the stadium in approximately on hour, and it’s ready for action. The 234-foot wide by 403-foot long field is 40 inches tall, weights 19 million pounds, and supports 2.2 acres of grass. The field has 542 wheel assemblies that roll along 13 steel rails embedded in the concrete floor. Seventy six of the wheels are driven by 1-horsepower electric motors, and the 42 wheels on the center rail are equipped with guide rollers to maintain the retractable field’s position during movement.
Location: Glendale, Arizona
Scope of Work: Design, Supply, Installation, Inspections & Preventive Maintenance
Project Client: Hunt Construction
Architects: HOK Sport and Peter Eisenman
General Contractor: Hunt Construction Group
Structural Engineer: Walter P Moore
The State Farm Stadium retractable roof was the first in North America to operate on an incline, providing a 100,000-square-foot opening in the dome-shape facility. Two retractable roof panels move along an arched travel path, which is 14 degrees in the open position above the end zones and becomes nearly flat as the panels meet above the 50-yard line in the closed position. Cable drives are mounted to the roof panels and spool cable that is anchored near the 50-yard line of the fixed building structure to move the retractable roof panels 182 feet between the open and closed positions in approximately 11 minutes