A roof that is covered with plants and typically not designed for general access. Usually an extensive system is a rugged green roof that requires little maintenance once established. The planting medium in extensive vegetated roofs ranges from 1 to 6 inches in depth. (Adapted from U.S. EPA) exterior vegetated surface area the total area of vegetation on the project site, including vegetated roofs and turf grass
First 10 image search results of extensive vegetated roof architecture