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− | <noinclude>{{alert|The information on green roofs will be updated in | + | <noinclude>{{alert|The information on green roofs will be updated in September 2014|alert-under-construction}}</noinclude> |
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[[File:MIDS calculator screen shot 1.png|300px|thumb|alt=screen shot of MIDS calculator for green roofs|<font size=2>MIDS calculator screen shot for green roof inputs and defaults.</font size>]] | [[File:MIDS calculator screen shot 1.png|300px|thumb|alt=screen shot of MIDS calculator for green roofs|<font size=2>MIDS calculator screen shot for green roof inputs and defaults.</font size>]] | ||
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*The top surface area of the green roof cannot exceed the total impervious area for the site | *The top surface area of the green roof cannot exceed the total impervious area for the site | ||
*The contributing impervious area cannot be more than 2 times the surface area of the green roof. Since the green roof itself is treated as an impervious surface in the calculator, the maximum run-on area to a green roof from a traditional roof must be equal to or less than the area of the green roof. For example, a 10,000 square foot green roof can also have a 10,000 square foot or less run-on area from a traditional roof. In this example, the maximum impervious area input to the calculator is 20,000 square feet. | *The contributing impervious area cannot be more than 2 times the surface area of the green roof. Since the green roof itself is treated as an impervious surface in the calculator, the maximum run-on area to a green roof from a traditional roof must be equal to or less than the area of the green roof. For example, a 10,000 square foot green roof can also have a 10,000 square foot or less run-on area from a traditional roof. In this example, the maximum impervious area input to the calculator is 20,000 square feet. | ||
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==Information== | ==Information== |