A green roof replaces traditional roofing with a lightweight, living system of soil, compost, and plants. It creates a thin, green skin atop a building that gives a little something back to the world.
The plants–and the dirt and gravel that hold them–filter rainwater and some of its pollutants. The plants produce oxygen that help clean the air. A green roof reduces a building's heating and cooling costs, acting as a form of insulation. And they lessen the heat island effect, in which buildings warm up so much that they heat the surroundings.
Learn how a landscape architect creates a Green Roof: