Eielson AFB EIE394 4-Bay Weather Shelter

The 4-Bay Weather Shelter project on Eielson Air Force Base converted Building 1335 into a 4-Bay hangar and weather shelter to support the F-35 program. The facility was previously used for general maintenance of F-16 aircraft and the new design incorporated substantial new equipment within the existing space to repurpose the facility for hazardous maintenance activities, with a focus on ease of maintenance and energy efficient operation. The new facility was designed to support aircraft fuel cell maintenance for the F-35A aircraft.

Coffman provided civil, structural, mechanical, electrical, and fire protection engineering for the 28,585 sf renovation. Located in Alaska, the shelter was analyzed and renovated as required to resist snow and wind loads per the International Existing Building Code (IEBC). As such a Tier II level ASCE 41 analysis was performed to more accurately design upgrades to the seismic force resisting systems. This complex building conversion included the following:

  • Complete replacement of utilities including steam, condensate, water, sewer service, and fire protection.
  • Seismic support upgrades to the braced frames and roof diagram
  • Complete replacement of the heating system including steam/glycol heat exchanges, a snowmelt system, new ventilation for general maintenance and hazardous fuel cell bays, and building automation systems.
  • Electrical upgrades to new utility transformer and 100kW standby generator.
  • The new fire alarm and fire suppression systems are in accordance with aircraft hangar guidelines including preaction sprinklers and high expansion foam with infrared optical flame detectors.
  • Enhanced commissioning.


  • Federal
  • Energy & Utility


  • Civil Engineering
  • Commissioning
  • Electrical Engineering
  • Fire Protection Engineering
  • Industrial Design
  • Mechanical Engineering
  • Seismic Engineering
  • Structural Engineering
  • Sustainable Design