![]() ![]() ![]() adding bold sweeps of native plant plugs to not only increase resilience and ecological benefits, but also make a bold aesthetic statement and.maximizing plant diversity and adding native species plugs and seed to maximize resilience to climate extremes, diseases, and pests.including drip irrigation and a water retention layer to compensate for the minimal soil depth available to hold water.requiring a lightweight growing engineered media.choosing a mat pre-grown at grade to allow plants to establish before facing the harsh conditions on the roof, as well as to maximize plant cover and wind resistance 150 feet up in the air.Because this is a public, highly visible project, designing an aesthetically captivating roof that succeeds right away was another especially important objective.ĭesign strategies used to achieve these design objectives include The designers aimed to maximize stormwater holding capacity and plant resilience on a roof with very limited structural capacity. At 17.4 pounds per square foot on most of the roof, the Target Center’s dead load capacity is much lower than that of a typical green roof. One of the most difficult challenges at this site was structural. To test for leaks and facilitate pinpointing the exact location of leaks throughout the roof’s lifespan so that the amount of overburden removed can be minimized, an Electro Field Vector Mapping (EFVM) leak detection system was installed. Quantitative financial lifecycle cost benefit analysis showed that over a 20 year study period, a green roof is more cost effective than a white reflective or a traditional roof.Ī state-of-the-art waterproofing membrane was used to withstand constant dampness, high alkalinity, and exposure to plant roots, fungi and bacterial organisms as well as varying hydrostatic pressures. The design process began with a quantitative and qualitative lifecycle cost benefit analysis that enabled the City of Minneapolis to decide with confidence that replacing the conventional roof on the Target Center with a green roof was the most cost effective and ecologically sound decision over the lifespan of the proposed roof. Green Infrastructure: For more information on green infrastructure benefits of green roofs, see Green Infrastructure benefits of green roofs (For more information on stormwater management in Minneapolis link here). Such positive impacts on local water bodies are valuable in a city that prides itself on its legendary waterbodies - The City of Lakes in the Land of 10,000 Lakes. It also mitigates stormwater runoff from a significant amount of previously impervious surface in a downtown location where space does not permit use of other low impact development (LID) (LID) techniques for stormwater management at grade. The green roof mitigates the urban heat island effect, provides greens views from above, provides wildlife habitat, and improves urban air quality on a scale that is not feasible at grade in an highly urban and ultra-urban environments like the site of the Target Center Arena in downtown Minneapolis. At 113,000 square feet, the Target Center Arena green roof was the 5th largest extensive green roof at the time of design and the first green roof installed on an arena in North America. When Minneapolis’ Target Center Arena needed a new roof, the City of Minneapolis chose to model a sustainable building and stormwater management approach by re-roofing with a green roof. Image Courtesy of The Kestrel Design Group, Inc. Aerial view of the Target Center Arena green roof, illustrating the use of different vegetation to create patterns in the roof. ![]()
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