North Bethesda Center

Bethesda, MD
Garden Roof® AssemblyGarden Roof® Assembly: ExtensiveRoofing
Project Type: 
New Construction
62,500 sq ft.
Completion Date: 

Washington, D.C. is one of the greatest testaments to architecture in the country, with historical roots dating back centuries and buildings continuing to stand the test of time. Just outside the district is Bethesda, MD, home to a 32-acre and $850 million North Bethesda Center – a mixed-use pedestrian-friendly development delivering more than 930,000 s.f. of office space, 202,000 s.f. of retail space and 1,275 multifamily housing units upon completion.

Although original plans called for a standard inverted roof membrane assembly (IRMA) with gravel ballast, the North Bethesda Center project demonstrates that shifts in architectural plans and structural modifications mid-construction can be successful, in addition to achieving green building with a modest budget. With strategic collaboration among developer, contractor and landscape architect teams, the finished product provides a showpiece of sustainable design integrated with innovative and effective landscape design.

Atop a ground level retail establishment, a courtyard type layout features a combination of sedum, grasses and a wide array of plant species of various sizes and colors, all in a compelling landscape design that serves as a visual amenity for residents of the adjacent tower housing unit.

The various roof levels are comprised of 55,000 s.f. of American Hydrotech assemblies; including 32,000 s.f. of stone ballasted Protected Membrane Roof complimented by 17,500 s.f. of Garden Roof® and 6,000 s.f. of the Ultimate Assembly®. Most importantly, the owner has peace of mind knowing that Monolithic Membrane 6125® and its 50 year track record is the seamless waterproofing for all of the assemblies. Phase two of the North Bethesda Center began in early 2009 and the entire project is expected to be completed between 2013 and 2015.

Washington Building Congress - 2008 Craftsmanship Award
LCOR Incorporated
Dorsky Hodgson Parrish Yue
Landscape Architect: 
Parker Rodriguez, Inc.
General Contractor: 
Bovis Lend Lease, Inc.

Recent Press

  • April 3, 2017
    Wind data is a critical issue to consider when building a new structure. An increase in the number of green roofs on buildings has driven a need for new wind design standards to be written for vegetative roofing assemblies. Richard Hayden discusses...
  • October 20, 2016
    (November 15, 2016) Richard Hayden, Hydrotech's Garden Roof Department Manager, will be speaking at the 2016 LED Specifier Summit and High Performance Building Forum. The design community continues to struggles with how to handle ever-increasing...
  • September 24, 2015
    (August 5, 2016) Excerpt from an article in Stormwater Magazine . With their myriad benefits, green roofs are becoming increasingly incorporated into new and existing projects. The International Green Roofs and Walls Project Database lists 1,599...
  • July 16, 2016
    (July 16, 2016) Excerpt from an article in Forester Daily News Green roofs – also known as vegetated or garden roofs – are key green infrastructure elements and are being increasingly recognized for their “valuable ability to absorb, reduce, and...
  • July 1, 2016
    CHICAGO, ILLINOIS (July 1, 2016) City Creek Center in downtown Salt Lake City, Utah, is one of the largest mixed-use urban developments built in the last 10 years. It's also one of the most innovative. Completed in 2012, the 23-acre project includes...
  • July 2, 2014
    American Hydrotech Inc. has released a free, interactive digital version of the company's popular Garden Roof® Planning Guide. The app – unveiled last week at the AIA Expo in Chicago – features pinch-to-zoom product photography, video animations, photo galleries showing Garden Roof® Assemblies in real-world applications, and design considerations.

Upcoming Events

    October 21, 2017 to October 22, 2017

    ASLA 2017 Annual Meeting and EXPO

    Los Angeles CA Event Details
    November 8, 2017 to November 9, 2017

    USGBC 2017 International Conference and Expo

    Boston Convention & Exhibition Center – Boston MA Event Details