Urban Farm DB
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Database research record2010·United States

Chicago Green Roof Initiative

U.S. Environmental Protection Agency

U.S. EPA Local Climate and Energy Program Webcast

Urban Farm DB summary

In a June 8, 2010 EPA Local Climate and Energy Program webcast, Michael Berkshire of the City of Chicago's planning department described the city's green roof policy. He stated that on a 90°F day, the green-roofed side of City Hall stayed around 90°F while the non-vegetated County Building side reached about 170°F, and credited a sustainable development policy (started 2004, expanded 2008) and a 2008 stormwater ordinance requiring sites to retain 0.5 inch of rain or increase perviousness by 15% as key drivers of green roof adoption.

Extracted facts

4 facts

Only numbers and their conditions are stored, as structured data — never the source's own sentences. Metric and condition names stay in English, as coded.

  • 90 degF

    surface temperature(green roof vs asphalt roof)

    Climate
    region
    Chicago
    method
    City Hall vegetated roof, 90°F ambient day
  • 170 degF↑ Increase

    surface temperature(conventional asphalt roof)

    ClimateControl: vegetated City Hall roof (~90°F)
    region
    Chicago
    method
    County Building black asphalt roof, 90°F ambient day
  • 0.5 inch

    required retention depth(stormwater ordinance)

    Policy
    region
    Chicago
    year
    2008
  • 15 %

    permeability increase requirement(stormwater ordinance)

    Policy
    region
    Chicago
    year
    2008

Direction of conclusions

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  • Heat islandSupports
  • Policy and governanceSupports

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