{"id":11869,"date":"2019-03-18T18:42:15","date_gmt":"2019-03-18T22:42:15","guid":{"rendered":"https:\/\/roofingmagazine.com\/?p=11869"},"modified":"2019-05-20T09:28:55","modified_gmt":"2019-05-20T13:28:55","slug":"at-the-wharf-vegetative-roofs-play-a-key-role-in-storm-water-management","status":"publish","type":"post","link":"https:\/\/roofingmagazine.com\/at-the-wharf-vegetative-roofs-play-a-key-role-in-storm-water-management\/","title":{"rendered":"At The Wharf, Vegetative Roofs Play a Key Role in Storm Water Management"},"content":{"rendered":"\n
\"\"
The Wharf is a riverfront community spanning nearly a mile of the Potomac River. The neighborhood features high-end hotels, luxury condominiums, retail shops, commercial offices and a music hall. Photos: The District Wharf <\/figcaption><\/figure><\/div>\n\n\n\n

According to the\nWashington D.C. Department of Energy and the Environment, the District is home\nto more than 3 million square feet of vegetative roof assemblies (VRAs). A\ncommitment to responsible storm water management has helped the nation\u2019s\ncapital rank first among U.S. cities when it comes to green roofs installed. From\nthe massive 500,000-square-foot VRA atop the Douglas Munro U.S. Coast Guard\nheadquarters (featured in the September\/October 2018 issue of Roofing) <\/em>to elegant boutique cocktail\nbars, VRAs are helping Washington, D.C., manage storm water runoff and\nproviding unique vantage points for taking in national landmarks. The Wharf, in\nthe District\u2019s Southwest quadrant, represents a \u201cneighborhood\u201d approach to\ngreen roofs.<\/p>\n\n\n\n

A riverfront\ncommunity spanning nearly a mile of the Potomac River, The Wharf is a mixed\nuse, public-private development, including high-end hotels, luxury\ncondominiums, retail shops, commercial offices and even a 6,000-seat music\nhall. While the design and aesthetics of different buildings at The Wharf\nproject a sense of diversity, VRAs are a unifying element. In addition to\nproviding visual interest and elevated spaces for public gatherings, VRAs help\nThe Wharf achieve its sustainability and water management goals.<\/p>\n\n\n\n

Managing Storm Water, Supporting Sustainability<\/strong><\/h2>\n\n\n\n

Water has long\nbeen a defining element of life in the District, whose neighboring waterways\ninclude not only the Potomac, but also the Anacostia River, Rock Creek and\nChesapeake Bay. To help manage storm water runoff, the District makes use of a\nmassive cistern system, permeable pavements, and extensive use of vegetative\nbio-retention supported by VRAs. The District of Columbia\u2019s Department of\nEnergy & Environment mandates measures that retain runoff from a 1.2-inch\nstorm event through green infrastructure and capture reuse systems. Specific\nstorm water retention rates are specified relative to a building\u2019s footprint. <\/p>\n\n\n\n

\"\"
The vegetative roofs help tie together the diverse types of buildings in the area. Photos: The District Wharf<\/figcaption><\/figure><\/div>\n\n\n\n

In addition to\nhelping manage storm water runoff, protected roof membrane assembly (PRMA)\nsystems at The Wharf also help to support the development\u2019s sustainability\nperformance goals, which started at the master planning stage. Sustainability\nobjectives supported by The Wharf\u2019s VRAs include reducing storm water discharge\nand improving thermal performance through the cooling and shading properties of\nsoils and plantings \u2014 an important consideration in a region renowned for its\nhumid summers. VRAs are also desirable in urban areas for the role vegetation\ncan play in helping filter pollution and providing habitats for birds and other\nwildlife. Finally, VRAs offer an aesthetically pleasing environment for\nemployees, occupants and visitors.<\/p>\n\n\n\n

The Wharf\ndevelopment was designed to achieve LEED Gold, while individual buildings\ntargeted LEED Gold or Silver. Constructed in phases, Phase One opened in 2017\nand took nearly 15 years to complete. While the Great Recession slowed\nconstruction, an \u201cupside\u201d of the delay was that a proliferation of PRMA\nassemblies across the District helped inform the assembly of green roofs at The\nWharf. Several high-profile buildings that employ similar roofing systems include the MGM Casino, the National Museum of African\nAmerican History and the National Archives.<\/p>\n\n\n\n

A PRMA Approach to Support Performance<\/strong><\/h2>\n\n\n\n

More than half of the roofs in The Wharf make use of an Owens Corning<\/a> PRMA that includes Owens Corning FOAMULAR 404 and 604 extruded polystyrene insulation (XPS) supplied by PPSI Maryland. XPS delivers unique water resistance and strength properties that differentiate it from other insulation products and make it ideal for VRA applications. In fact, the demanding conditions on rooftops helped prompt the National Roofing Contractors Association (NRCA) recommendation to use only XPS insulation for VRA applications. The innate water resistance of XPS helps a roofing system retain its R-value and energy-saving power while retaining its compressive strength to bear a significant amount of overburden. Strength is critical in a PRMA application, as the insulation must be able to withstand the weight of vegetation, rainfall, growing media, pavers and surrounding surface materials.<\/p>\n\n\n\n

\"\"
Sustainability objectives supported by The Wharf\u2019s VRAs include reducing storm water runoff, improving thermal performance, and providing habitats for wildlife. Photos: The District Wharf<\/figcaption><\/figure><\/div>\n\n\n\n

At the highest\nlevels, the rooftop plants and vegetation help serve as a giant sponge to\nabsorb the rainwater. In a PRMA roof, insulation under the plant layer, growing\nmedia and filter\/drainage layer is placed above a waterproofing layer which\ndirects water horizontally to a series of overflow vaults. A network of massive\n700,000-gallon cisterns throughout the District collect and control the release\nof water. <\/p>\n\n\n\n

In addition to water, wind was another consideration when planning VRAs at The Wharf. Rock curbs from Hanover Architectural Products<\/a> help mitigate against winds coming in off the riverfront. Other roofing materials that help The Wharf PRMAs achieve performance include waterproofing membrane 790-11 Hot Rubberized Asphalt by the Henry Company<\/a>, EMSEAL<\/a> expansion joints to tie together air barriers, and Hanover Architectural Products pavers and sedum mats supplied by Sempergreen<\/a>. <\/p>\n\n\n\n

Contractor Coordination and Communications\nAre Key<\/strong><\/h2>\n\n\n\n

As a\ncommunity-focused development, The Wharf celebrated its grand opening with\nseveral public events. Hometown rock band the Foo Fighters performed for a\nsellout crowd at the Anthem music center on October 12, 2017. The enormous task\nof completing multiple buildings against a very tight timeline was a challenge\nfelt by all of the contractor trades on site, according to Brian Davis, general\nsuperintendent at James Myers, the roofing contractor charged with installing\ngreen roofs at The Wharf. The immensity of the project required careful\nscheduling and logistics among roofers and other trades. Teams worked\nthroughout the night and seven days a week as Phase One approached completion.<\/p>\n\n\n\n

\"\"
Photos: The District Wharf<\/figcaption><\/figure><\/div>\n\n\n\n

As the countdown\nto the October 12 grand opening approached, construction teams followed tight\nschedules outlining exactly what team members would be working in what area at\na particular time. The logistical demands of building nine buildings over six\nblocks made traffic bottlenecks an ongoing challenge throughout the project.\nScheduling details had to consider not only the District\u2019s notorious rush hour\ntraffic but also events and attractions in the area. For example, the\nWashington Nationals baseball team played a number of weeknight baseball games\nat home. Trades working on The Wharf were required to clear the streets three\nhours before the first pitch of each Nationals home game. While navigating\nevent schedules and a tight construction schedule, contractors also had to\nmaintain high levels of safety and quality.<\/p>\n\n\n\n

The public event commemorating the completion of Phase One celebrated a one-of-a-kind public space winding along one of the nation\u2019s most historic riverfronts with an epic rock concert. More quietly, the completion of Phase One celebrated Washington\u2019s role as a leader in the installation of VRAs while helping the District achieve sustainability goals and comply with storm water management mandates. <\/p>\n\n\n\n

MATERIALS<\/strong><\/h4>\n\n\n\n

Insulation:<\/strong> FOAMULAR 404 and 604 extruded polystyrene, Owens Corning, www.owenscorning.com<\/a><\/p>\n\n\n\n

Waterproofing Membrane:<\/strong> 790-11 Hot Rubberized Asphalt, Henry Company, www.henry.com<\/a><\/p>\n\n\n\n

Expansion Joints:<\/strong> EMSEAL, www.emseal.com<\/a><\/p>\n\n\n\n

Sedum Mats:<\/strong> Sempergreen, www.sempergreen.com<\/a><\/p>\n\n\n\n

Pavers:<\/strong> Hanover Architectural Products, www.hanoverpavers.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The Wharf is a riverfront community spanning nearly a mile of the Potomac River. The neighborhood features high-end hotels, luxury condominiums, retail shops, commercial offices…<\/p>\n","protected":false},"author":2,"featured_media":11871,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[38,34],"tags":[8388,8390,3044,779,8389,328,8630,8631],"jetpack_publicize_connections":[],"yoast_head":"\nAt The Wharf, Vegetative Roofs Play a Key Role in Storm Water Management - Roofing<\/title>\n<meta name=\"description\" content=\"According to the Washington D.C. 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