|The American Society of Landscape Architects (ASLA) is showing their committment to sustainable design by incorporating a greenroof atop their Washington, DC. headquarters. Michael Van Valkenburgh Associates, Inc., lead the design process, collaborating with Conservation Design Forum to develop the design and specifications for the approximately 3,000-square-foot roof surface. Gensler provided architectural services relating to the roof access. The plan was to create a landmark demonstration project, not only for the landscape architecture profession and the Washington region, but also for the allied development, design, and construction professions. A primary focus of the project was to make greenroofs more mainstream and demonstrate that landscape architects play a central role in green roof design and construction.|
ASLA received a $25,000 Chesapeake Bay Small Watershed Grant from the Chesapeake Bay Program, a partnership between Virginia, Maryland, Pennsylvania, the District of Columbia, the Chesapeake Bay Commission, and the federal government. The National Fish and Wildlife Foundation, in cooperation with the U.S. Environmental Protection Agency, is charged with administering the grant. The greenroof dedication date was on April 26, 2006 - the birthday of Frederick Law Olmsted, who founded the American landscape architecture profession. The ASLA HQ is the recipient of the 2010 Green Roofs for Healthy Cities Award of Excellence - Intensive Institutional Category.
|The ASLA roof contains six distinct greenroof conditions, representing extensive, semi intensive, and intensive systems ranging in growing media depth of 3 - 21 inches. North and South "waves" dominate the design, with a central viewing platform with seating areas for the public. The ASLA Green Roof at a Glance - Here are the elements of the ASLA green roof, along with the types of plantings that are used with each element:|
The 1,250 square-foot viewing platform provides contiguous coverage of the portions of the roof not covered by the north and south mounds or HVAC units. The planting system has a three-inch depth, planted with sedums. The platform has a flat metal grate suspended approximately one inch above the plantings.
The south mound has a five-inch planting system, planted with sedums. The mound is constructed of Styrofoam, and the planting soil is threaded with ribbons of non-biodegradable plastic to prevent erosion and sliding.
The north mound has a six-inch planting system, planted with sedums. The mound is constructed of Styrofoam, and the planting soil will be threaded with ribbons of non-biodegradable plastic to prevent erosion and sliding.
The stairwell structure is a simple building constructed on top of the building?s roof to cover the access points. The structure has glass glazing at the front to provide a view of the roof during inclement weather. The roof was covered with soil to allow passive planting experimentation.
ASLA has installed monitoring equipment on the 3,000-square-foot roof and tracks stormwater runoff, water quality, and air temperature to compare with data from the conventional roof on the building next door.
The American Hydrotech MM6125?EV-FR, a seamless waterproofing/roofing membrane is protecting the integrity of the overstructure. And, to effectively confine and stabilize the growing media on the sloped ?waves? GardNet? was installed. This unique component of the AH Garden Roof Assembly allows design professionals to expand beyond traditional flat roof applications, up to a 7:12 roof pitch.
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|The American Society of Landscape Architects Headquarters is located at 636 Eye Street NW, Washington D.C. 20001. Tours of the ASLA green roof are available for groups or individuals on Tuesdays, Wednesdays and Thursdays between 10:00 am and 2:00 pm by calling ASLA at 202.898.2444 or filling out a form here. Buy the comprehensive 2007 book "Green Roof: A Case Study: Michael Van Valkenburgh Associates' Design For the Headquarters of the American Society of Landscape Architects" by Christian Werthmann from Amazon.com here. See the ASLA Green Roof Fact Sheet here. Stay up to date on the monitoring of the American Society of Landscape Architects' Washington D.C. headquarters: See a synopsis of comprehensive water monitoring data from the first year of the ASLA Headquarters? greenroof here, and the full briefing report here (both .doc files). Complete coverage can be seen on their live webcam here, and on their website's Green Roof Central here, including news, drawings and interviews. Visit the ASLA Green Roof Education page here. And the ASLA greenroof page has been updated and now includes a listing of press coverage for the green roof, and an observation log on plant growth. Download a project PDF here.|
Learn more about the project in Richard Hayden's Sloped and Complex Green Roofs from Greenroofs.com's inaugural 2011 Greenroofs & Walls of the World? Virtual Summit our GreenroofsTV channel on YouTube. Greenroofs.com featured the ASLA Headquarters in our 2009 Greenroofs of the World Calendar for the month of August. Check out the great greenroof coverage in the April 25, 2006 USA Today article "Green roofs swing temperatures in urban jungles," including an animated graphic of the ASLA green roof. See the Project Spotlight from the American Hydrotech website here, and learn more about American Hydrotech in The Greenroof Directory here. Read Linda Velazquez's May 7, 2010 "GPW: The American Society of Landscape Architects (ASLA) Headquarters" in the Sky Garden Blog here.
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