901 K St. maximizes daylight, manages energy costs


Photos by Anne Gummerson, courtesy of Icon Exterior Building Systems.

"Green office buildings are not a new trend. They are becoming the new standard. Like property owners, occupants also are more sophisticated about their wants and needs in an office space."—Kevin Robbins, regional sales manager, Wausau Window and Wall Systems. 

The basics: The prominent office and retail complex 901 K St. in Washington, D.C., was designed and built to achieve Gold certification from the U.S. Green Building Council's Leadership in Energy and Environmental Design program. Sustainable attributes of the 12-story, $60 million dollar development include green roofs to minimize the urban heat-island effect, water-conserving plumbing fixtures and low-emitting interior materials, and low-volatile organic compound finishes. In addition, the building's energy-efficient lighting system and high-performance, non-CFC HVAC system are complemented by curtain-wall systems and sun shades. The floor-to-ceiling windows allow 60 percent of the building's interior space to receive natural light, according to a Wausau Window and Wall Systems release. "Large southern exposures require thoughtful planning to maximize daylighting and views, while managing energy costs. Effectively-engineered, modern curtain-wall systems not only keep energy costs down by managing unwanted solar heat gain, which reduces the load on the HVAC systems, they keep people more comfortable, which means they're more productive in an office setting," said Carl Wanta, project manager, Wausau Window and Wall Systems.

The players: Owner and developer, Carr Properties & Affiliates, Washington, D.C.; architect, SmithGroup, Washington, D.C.; general contractor, Clark Construction Group LLC, Washington, D.C.; glazing contractor, Icon Exterior Building Solutions, Washington, D.C.; glazing system and sunshade manufacturer, Wausau Window and Wall Systems, Wausau, Wis.; aluminum finisher, Linetec, Wausau, Wis.; glass fabricator, Viracon, Owatonna, Minn.

The glass and systems: RX Series window wall and UW Unit Wall Series curtain wall, plus custom sun shades and ornamental accents, all finished with two-coat, 70 percent PVDF mica Sunstorm paint. Radiant low-emissivity glass, VRE-38.