Word: werthmann
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...Werthmann has only been able to place two inches of substrate on the roof of Gund Hall—most green roofs require at least four—and only 10 to 20 percent of test areas have sprouted plants...
...effective green roof, plants should cover about 70 to 100 percent of the area, Werthmann said...
...this roof as really a test roof—it’s not a commercial product,” Werthmann said...
...Werthmann added that he hopes to create a cost-effective model for installing green roofs, as the high costs of the new green technologies often deters companies and other institutions from retrofitting old buildings...
...from the deluxe version to the really poor man’s version,” Werthmann said...