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Treetops in the Rooftops
Thomas Balsley, FASLA, says that a forest roof was not what the client initially had in mind.
"The roof landscape includes more than a hundred 25-to-35-tall trees set in mounds of earth hidden by shrubs. Each tree sits in a four-and-a-half-foot-deep soil bed, which are designed to hold the deep root systems. (The soil beds for these trees are much deeper than those for more conventional green roofs)."