EPA Staff of Environmental Protection Agency writes: Green roofs can contribute to environmental and livability goals—to mitigate the urban heat island effect, maintain clean air and water, and lower energy costs in buildings—while greening the urban landscape. 2. The net effect reduces the temperature of the r oof … Green roofs are covered with growing media and vegetation that enable rainfall infiltration and evapotranspiration of stored water. The initial cost of a green roof can be 30 percent greater than a conventional roof, but the long-term savings on maintenance and energy costs can offset the initial cost by increasing the roof’s lifespan by 50 percent. A large body of evidence shows that green roofs help to reduce local ambient air and surface temperatures in cities. To qualify, the green roof must cover 50% of the building's rooftop or 75% of 'Eligible Roof Top Space', defined as the total space available to support a Green Roof. EPA building costs zProjected cost for detention w/o green roof = 34,000s.f. Costs for Green Infrastructure and Stormwater Controls Bob Newport U.S. EPA Region 5 (Chicago Office) August 5, 2015. foot as installations increase, and soil substrate and plants became more available (EPA, 2009). Costs of a green roof tray system range from $10 to $30 per square foot. However, over its lifetime, the green roof would save about $200,000. Green Roof Economics Benefits-----Costs NPV = Net Present Value Benefits Costs Rinaldi, Buffam et al. Labor Costs to Install a Green Roof . A green roof system atop a building helps manage stormwater and reduce energy costs for cooling. Depending on design, plant type, and climate conditions the price of green roof construction typically ranges from $15-20 per square foot, though the EPA projects that extensive green roof installation costs should drop to $8-$15/sq. Topics to be Covered EPA data collection and cost analysis focused on post-construction stormwater BMPs - Methods - Some results ... Green Roof Detention Basin. Maintenance issues which ensure longevity of the green roof 6. 5. (10.70) = $363,800 z2 yr. cost difference for green roof is $96,485 (not including parking revenues lost and reduced heating costs) zAdditional detention costs 363,800 – 150,000 = 213,800 zGreen roof costs - $310,285 zAdditional 2 yr. cost = 310,285 – 213,800 ; Primary green roof costs are related to installation and maintenance. The green roof would cost $464,000 to install versus $335,000 for a conventional roof in 2006 dollars. Labor makes up a significant portion of the cost of a green roof, mostly because the process of creating one can be labor-intensive. Transforming a conventional roof into a green … Business Privilege Tax – Green Roof Tax Credit: The city offers a credit against the Business Privilege Tax of 25% of all costs incurred to construct a green roof up to $100,000. GSA’s green roof report estimated that green roofs on commercial and public buildings provide a payback, based on 50 year average annual savings, of about 6.2 years nationally, internal rate of return of 5.2%, and an ROI of 224%, based on a net present value of $2.7/square foot. In Prep Assumes a 40 year lifespan of the green roof and a 20 year lifespan of a conventional roof Model based in Cincinnati with CSO’s present Largest cost of green roof is related to installation but roof replacement costs are reduced Green roof vegetation can shade buildings and increase evapotranspiration, which shifts a roof’s energy balance (or “budget”). Detailed cost variables for green roofs 7. 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