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Why Don’t More Cities Require Green Roofs?

on October 12, 2018 at 7:05 am under , ,

For people living in cities plagued by the heat island effect, air pollution, stormwater, and the psychological and physical effects of living in an unnatural environment, turning the rooftops of big buildings into living gardens and parks seems like an ingenious way to mitigate some of those problems, and make urban life more pleasant as well.

Jennifer Bousselot, an assistant professor in the Department of Horticulture and Landscape Architecture at Colorado State University, says that putting a relatively shallow installation of a few inches of soil could cost between $15 to $35 per square foot in the Denver area. A deeper layer capable of growing larger plants and retaining more moisture would be even more costly. But even though Denver may have to loosen its stringent green roof requirements, Bousselot still sees green roofs as the future, both in the Mile High City and elsewhere. As more green roofs are built, the cost will drop, she says. “We’re urbanizing at such a rate that we have no other option,” she says. “If we’re going to green, we’ve got to green our roofs.”

Watch this excellent video from NPR:

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