What kind of Green Roof did Calhoun install?
Calhoun’s Green Roof is a European-engineered, multi-layered, semi-hydroponic, rooftop agri-system. It is also an INTENSIVE green roof, as opposed to an extensive green roof (see Green Roof Facts for specs.) The Earth Pledge Foundation describes intensive green roofs as those that “can be utilized as real roof gardens… [They] generally require an underlying roof structure with high load bearing capacity, in order to support the weight of deeper growing medium and larger plants. With a growing medium depth of 8″ or more, intensive roofs can accommodate a wide range of vegetables, shrubs, and sometimes even trees.” Extensive green roofs, according to Earth Pledge, “require only a few inches of growing medium (2.5 to 6 inches) and little additional irrigation beyond rain.
