By John DeFore

The green roof concept — in which some form of plant is grown atop a building — is spreading in multiple directions in the States. Not just the realm of futurists (though we love this idea) or extravagant fashionistas (see some lovely examples here), the field is drawing interest from homeowners and corporations with a range of motivations.

Now a study by the University of Texas at Austin’s Lady Bird Johnson Wildflower Center has quantified some of the issues motivating folks to put plants on the roof and found that the benefits are substantial, although results can vary widely depending on how the roof is composed and installed.

At the Wildflower Center, a team led by ecologist Dr. Mark Simmons studied roofs made by six different manufacturers with an eye toward helping the fledgling industry make better performing products. “Just having a green roof may not mean anything in terms of preventing water from reaching the street level, for instance,” Simmons has said. “Green roofs have to be done right, and our hope is to help manufacturers understand how to improve their designs.”

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