Advantages | Components | Application | Projects | Assistance Atlanta City Hall Green Roof CLIENT: City of Atlanta, Department of Watershed Management SIZE: 3000 square feet COMPLETION: 2003 Photo courtesy of Atlanta City Hall, Dept. Watershed Mgmt.
	Atlanta City Hall Green Roof is the first municipal project of its kind in the south. The project, located in the heart of downtown Atlanta, offers aesthetic and functional benefits for City Hall and Atlanta. The greenroof not only contributes to stormwater management, reduced heating and cooling costs, water quality improvement and heat reduction, but also serves as an outdoor patio amenity for employees and visitors. The greenroof is open to the public and is accessed from the fifth-floor cafeteria. Installation of J-DRain GRS (high strength dimple core and two layers of geosynthetic fabric attached top and bottom), took one day and covers the entire roof. J-DRain GRS dimple core root barrier filter fabric placed on top layer will prevent roots from impeding the drain core and allowing maximum drainage. The green roof has no irrigation system; consequently, the water retention chambers of the drain core will store excess water. Concrete pedestal pavers, soil, stepping-stones, and 3000 plants were installed directly on top of the J-DRain GRS drain layer. On-site Photos: J-DRain GRS fifty-foot rolls are easily lifted and transported up the freight elevator and out to roof area. J-DRain GRS is applied over the entire roof area. Drain boxes are cut out for easy access. Additional root barrier filter fabric is applied up the side of parapet wall. This prevents roots from impeding the drain system or damage to wall. "Engineered" soil, pavers and plants go directly on top of J-DRain GRS. D.C. GREENWORKS D.C. Greenworks is a non-profit enterprise serving the Washington D.C. metropolitan area with full-service greenroof, rain garden, and Low Impact Development (LID) consulting, design, and installation. They work hand-in-hand with community leaders, inner-city residents, neighborhood organizations, and small businesses to provide training, tools and technologies that utilize, advance, and protect the environment. D.C. Greenworks trains and employs at-risk young adults in the skills necessary to meet the growing demand for these new, technical environmental services. The following D.C. Greenworks greenroof projects were installed using J-DRain GRS (Green Roof System), a pre-assembled drainage composite consisting of a high strength dimpled core and two layers of geosynthetic fabric attached top and bottom. JDR Enterprises, Inc. recognizes the growing demand of environmental technical services and commends D.C. Greenworks for the valuable work they do for the city of Washington D. C. We are proud to be affiliated with D.C. Greenworks and their commitment and promotion of greenroofs. All photos courtesy of D.C. Greenworks. PROJECT: 1425 K STREET GREEN ROOF
	At 1425 K St., the 3,500-square-foot roof garden has 9,730 plants, a weather station, and an unplanted area to compare temperature, rainfall, and runoff. This 3,500 square-foot greenroof project, located 13 stories above1425 K Street, is Washington D.C.’s first high elevation greenroof in the heart of Washington D.C.’s business district. The D.C. Environmental Health Agency and the National Fish and Wildlife Foundation funded the greenroof in collaboration with D.C. Greenworks, Casey Trees, and Blake Real Estate. It will allow D.C. Greenworks to demonstrate the viability and benefits of rooftops planted with pollution-reducing vegetation.
	Several steps were required to prepare the roof for 33,000 pounds of engineered soil and 9,730 low-growing succulent plants comprised of 11 sedum species. Following removal of the upper layers of the previous roof, a new waterproof membrane/root barrier was installed in conjunction with an electronic leak detection system that showed the system to be waterproof prior to planting. On top of the new membrane, a two-inch layer of polystyrene insulation was installed, topped by J-DRain GRS (root barrier filter fabric over an inch-thick drainage mat). Soil was spread three inches deep across the roof and topped with a loosely woven jute mat to hold it in place until the plants are fully established in one to two years. The plants were hand planted in clusters to form a mosaic of variety, color, and texture. Completion date, 2004.
	PROJECT: ADAMS MORGAN, WASHINGTON, D.C.
	This 250 square-foot greenroof row house addition also serves as a small seating area for the homeowner. Since most storm water in Washington D.C. is generated from residential rooftops, this greenroof is a great example of small-scale, high-density, residential greening. Completion date, 2004.
	PROJECT: TAKOMA PARK, MD RESIDENCE
	This 400 square-foot greenroof is part of a passive solar, environmentally sensitive home addition, and includes a terraced masonry wall to enable you to see the greenroof from ground level. Completion date, 2004.
	PROJECT: TAKOMA PARK, MD RESIDENCE J-DRain GRS is installed over entire roof area. This 450 square-foot second-story greenroof was designed as a high-end outdoor room that features a custom-crafted, locust trunk arbor and an inlayed slate patio. This project was part of an environmentally sensitive home addition designed by Helicon Works Architecture. Completion date, 2003.
	PROJECT: SHAW ECOVILLAGE SHED ROOF
	Located at 6th & R Streets, NW, this demonstration greenroof and tool shed was designed and built by the Shaw EcoDesign Corps, with assistance from D.C. Greenworks, as part of a larger LID demonstration at their Chain Reaction Youth Bike Shop site. Completion date, 2003. > J-DRain GRS Brochure > City Hall Case Sudy > Green Roof Booklet