Location: Washington, D.C.
Project type: roof replacement
Client: General Services Administration and the U.S. Tax Courts
MTFA Architecture led this 40,000-square-foot roof replacement project for a building designed by Victor Lundy and completed in 1974. It is recognized as a historically significant modern work, eligible for inclusion in the National Register of Historic Places.
To accommodate the historic nature of the building, existing structural design loads, sustainability concerns and preservation of the exterior appearance from the street level, MTFA Architecture used several different roofing types to achieve a sustainable, practical solution.
The new roof consists of a green roof system, built-up roof system and an inverted roof membrane. The built-up roofing system has a highly reflective membrane that reflects sunlight and ultimately keeps the building cooler. This system is also lighter than other alternatives and utilized in places where the design loads could not be increased. The green roof system filters water runoff and reduces the building's hydrological footprint.