DASR Building, Greenland

Thule Air Base (THU)


Several logistical challenges complicated the design and construction of a radar facility that comprises a tower and an equipment support building at a remote U.S. air base 900 mi inside the Arctic Circle. SGH worked closely with Raytheon, the contractor, fabricators, and manufacturers to deliver a project with site access limitations, material shipping and procurement constraints, a restricted construction season, and an aggressive delivery schedule.

Highlights of SGH’s work on this project included the following:

Foundation. The lack of nearby batch plants precluded the use of cast-in-place concrete, and construction of specialty deep foundations was prohibitive due to mobilization constraints and permafrost soil. SGH designed segmental precast concrete foundation elements to create a mat foundation for the radar tower and spread footings with piers for the radar equipment building. To accelerate production, we engaged a Massachusetts precaster who transported the precast elements to Norfolk, Virginia, and we had the precast concrete elements shipped to the site on a supply barge that travels to the site once a year. SGH discretized the foundation elements into repeatable shapes that were small enough to be transported in shipping containers and developed details to simplify fabrication and installation. We utilized post-tensioned bars to clamp the mat foundation elements together and grouted splice sleeves to connect the piers to the footings.

Structure. The original project specifications for the equipment support building called for structural steel shapes and bolts based on ASTM standards. To accelerate the schedule for the Danish contractor, SGH researched equivalent European materials and structural shapes, researched bolts from the British Standard, and developed details to accommodate these European products.

Building Envelope/Fire Protection. SGH designed the building enclosure for wind pressures up to 225 psf. When the Danish contractor wished to use building cladding (insulated metal wall panels) from a European manufacturer to accelerate the schedule, SGH coordinated independent testing to verify compliance with ASTM requirements for fire rating.

Project Summary



Completion Date
New Construction
Structures | Performance & Code Consulting
Science & Defense
Raytheon Company
Specialized Capabilities
Geotechnical | Fire Life Safety & Accessibility

Key team members

Dominic  Kelly
Dominic Kelly
Senior Principal
Scott DiFiore
Scott DiFiore
Heavy Civil Division Head, Boston
Cory  Brett
Cory Brett
Senior Project Manger