Products / Columbia Green Semi-Intensive Layered System

Columbia Green's Semi-Intensive Layered System is a built-up green roof with deeper media than its extensive system, so grasses and perennials can be planted alongside sedum. It uses the maker's semi-intensive growing media over a water retention layer, filter layer and drainage layer, all of which can be cut in the field to fit curves and irregular shapes. The maker lists a media depth of 6 to 8 in and a saturated weight of 39 to 54 psf.