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Anyone have input on the best material to use on a flat roof? I am working on a new house that will have a 3/12 metal roof over half of it and a flat (1/4 in/ft) roof over the other half (about 500 sq ft). We are interested in getting the house "green certified" and I am interested in what people consider the best material to use both from a waterproofing standpoint and a green standpoint. PVC and EPDM are the two materials that have been suggested.