The 1.2-million-sq-ft, 11-story U.S. Coast Guard headquarters project is situated on a severely sloping, 176-acre site. That factor was one of many that made construction challenging for numerous specialty contractors, including curtain-wall and window contractor Harmon Inc.
Because some areas of the project site did not allow the specialty contractor to set up its equipment and work from the exterior, the firm was forced to install the curtain-wall system and windows from the inside of the building. Due to these limitations, Harmon's crews carefully guided the shop-glazed units into the building and then, from there, manipulated them into place.
Adding to the challenge was the atypical design of the curtain wall, which consisted of 3,600 pre-glazed units, with 1,800 unique sizes, shapes and configurations. The system's complexity required the shop and field teams to coordinate closely to ensure that each unit was installed in the correct location.
Furthermore, the system's design used more than three thousand 14-in. custom exterior vertical sun breaks for both the curtain wall and the strip windows. Harmon designed the sun breaks to be applied to the units after installation on the building.
The facility, which is located on a National Historic Landmark site, is targeting LEED Gold certification.
U.S. Coast Guard Headquarters, Washington, D.C.
owner U.S. General Services Administration
Design-Builder Clark Construction Group
Construction Manager Tishman-AECOM
Architect of Record for HQ Bldg. WDG
Interior Fit-out Architect HOK Interiors
Landscape Architect HOK Landscape
Architect for CUP, Garage McKissack & McKissack
Exterior Glass and Glazing Harmon
Quality Control McKissack & McKissack
Structural Engineer Cagley & Associates
Electrical-Mechanical Engineer Girard Engineering
Civil Engineer Loiderman Soltesz Associates
Skin Consultant Tadjer Cohen Edelson
Geotechnical Consultant ECS Mid-Atlantic
Fire, Life Safety Consultant ARUP
Cast-In-Place Concrete Clark Concrete
Excavation Subcontractor Metrol-Total JV Electrical contractor Dynalectric Mechanical contractor John J. Kirlin Glazing contractor Harmon
Excavation Subcontractor Metrol-Total JV
Electrical contractor Dynalectric
Mechanical contractor John J. Kirlin
Glazing contractor Harmon