A green roof is a vegetated roofing system that is an extension of a standard roof structure. Green roofs can be either intensive, with greater soil depth providing for a wide range of larger plantings or extensive, with shallower soil depth suitable for only low-growth vegetation. At a minimum, a green roof will provide all the typical envelop protection from the elements.
Other benefits include enhanced insulating properties compared to typical roofing system because of the added layers of soil and plant life. This attribute combined with an ability to reduce heat island effect by slightly cooling the immediate vicinity can lead to energy savings. As well, a living roof can be aesthetically pleasing, attract wildlife and become a positive space for building occupants to gather.