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8th and Howell Hotel, Seattle, WA

Project data

Location: Seattle, WA, United States

The 46-story 8th & Howell Hotel is one of the largest construction projects Seattle has ever seen. When completed in 2018, it will be Seattle’s largest hotel providing 1.4 million square feet of space in close proximity to the Washington State Convention Center.


PERI supplied three ACS Core 400 automatic climbing systems using PERI MAXIMO Formwork for construction of the three thick-walled cells that make up the 35’ by 90’ core. PERI engineers designed a roof structure out of VARIOKIT components that is keeping the elevator shafts dry during installation immediately beneath the forming operation. Hydraulic flaps installed on the VARIOKIT roof directly over the walls allow placement of pre-tied rebar cages in the formwork. Decks for one level below ground and the ground level were designed to eliminate form savers by casting the lobby slabs along with the main slabs. Perimeter walls were formed with PERI MAXIMO Formwork and SB Brace Frames. PERI SKYDECK formwork with MULTIPROP legs is being used to form elevated decks. Later in the process, construction of the tower perimeter will be done using RCS-P Rail Climbing System. PERI provided a significant amount of equipment to meet the requirements of this project, including 15,000+ ft2 of MAXIMO, 70,000+ ft2 of SKYDECK, 250,000+ ft2 of MULTIPROP reshores, and three cells of ACS Core 400.


Sellen Construction, Seattle, WA

Customer's benefit

  • PERI engineers designed a roof structure on top of the climber to keep elevator shafts dry during construction, enabling elevator installation immediately beneath the forming operation thus accelerating construction by nearly a year.

PERI solution

  • PERI ACS Core 400 Self-Climbing Formwork
  • MAXIMO Wall Formwork