PREMIER Center Siding Found Structurally Sound by Independent Third Party

An independent firm, Simpson Gumpertz & Heger Inc., today issued the building enclosure report regarding the structurally integrity of the Denny Sanford PREMIER Center siding. The report concludes that the siding is functionality and structurally sound.

“Our incredible events center has proved its mettle time and time again. We did it again, Sioux Falls. Let’s now take our time and resources to capture more opportunities for our great city,” says Mayor Mike Huether.

The report’s conclusions state:

  • The metal panel cladding is generally installed according to construction documents and shop drawings. The installation does not meet the specification requirements allowing for thermal movement.
  • The metal panels generally appear to be fastened to the building per the approved shop drawings. The fastening pattern indicated on the shop drawings, assuming the fasteners recently provided by Dalsin are the same as those used on the project, is sufficient to resist the applied wind loads.
  • There are no reports of leakage into the building. Water and air leakage do not appear to be occurring through the building enclosure, including at the IMETCO metal panel locations and opaque wall systems. Window systems need to be monitored to confirm that observed stains are not active water leaks.
  • The visual appearance of warping, buckling, or bulging at joints is most likely due to the lapped construction of flat metal panels around a curved building. Tight transverse and longitudinal joints between metal panels contribute to the appearance of buckling due to thermal expansion. To avoid this appearance, the panels needed to be precurved. Long term, the appearance of buckling may worsen due to cyclic loading, and regular inspections could identify panels for replacement based on excessive buckling.
  • Loose trim components need to be secured to the building. Inspect the building trim to identify issues with the attachment, set in sealant and mechanically attach with rivets or screws, if necessary.

“When our new events center was being constructed and every day since, we were confident the siding was structurally sound. Today, an independent third party has confirmed that once and for all,” says Mark Cotter, Director of Public Works.

In October 2017, the City of Sioux Falls issued a request for proposals for an independent review of the Denny Sanford PREMIER Center’s IMETCO CF-12 exterior metal wall panel system for functionality and structural soundness. In addition to a review of the exterior metal wall panel system, the consultant also reviewed the air and moisture barrier system behind the metal wall panel system. Simpson Gumpertz & Heger Inc., a Chicago-based company with extensive knowledge and experience in building enclosure systems, was chosen to complete the review. The firm conducted their field observations of the siding on December 12 and 13, 2017.

The City has requested that Simpson Gumpertz & Heger Inc. formally present their findings to the City Council during its regularly scheduled Informational Meeting on Tuesday, January 16, 2018. The full completed report is publicly available at


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