Johnston High School

Johnston, Iowa

356,756 GSF

Alvine Engineering provided mechanical, electrical, plumbing, and fire protection for the soon-to-be largest high school in Iowa. The new Johnston High School was necessitated by a growth of 2,431 students in its district since 2000. With over a $72 million budget for this facility, it will become the largest high school in Iowa serving up to 1,800 students in grades 10-12. This breathtaking facility will be well equipped with cutting edge classrooms with retractable walls to combine two classrooms, promoting cross-discipline learning and productive groupwork. The new school will also have a 1,200-seat auditorium for the performing arts.


  • Selected to receive the Alliant Energy, Black Hills Energy and MidAmerian Energy Company’s Excellence in Energy Efficient Design award based on 61% kBTU savings when compared to the program baseline.
  • The building will be conditioned using displacement ventilation with the exception of the administration and athletic department wings, which will utilize a water-cooled variable refrigerant flow (VRF) system.
  • A geothermal bore field will be used to transfer heating to and from the earth as part of the building conditioning process.
  • The entire building includes an automated fire suppression system, including a wet-pipe sprinkler system.
  • The facility was provided with a complete voice/data communications structured wiring system, including telecommunications spaces and pathways, equipment racks and cabinets, telecommunications cables, termination hardware, cable management hardware, and telecommunications jacks.
  • Electronic security system provisions for this project include; access control and video surveillance at selected areas, head-end equipment upgrades and/or consolidation, and integration with existing district-wide access control and video management system.
  • Each classroom and conference room shall be provided with an Extron Digital PlenumVault system with four inputs. In addition to the PlenumVault system each room will be provided with an HD projector.
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