10-18-2012, 05:24 AM
Another big problem with the plantings on the roof is that many roofs here are for catchment for the water supplies of the property... green roofs would not be as practical for catchment, as you would have to have better particle filtration systems....and earth filtration for the rainwater is not really a big need here.... most of the purification/filtration is for things picked up on the roof & within the catchment system...