Types of living roof
Extensive living roofs are used to create an ecological landscape on the roof of a building and are the lowest cost form of living roofs. Using mostly sedum, moss, perennial herbs and grasses they are based on a thinner substrate and generally require little maintenance and are hugely beneficial to wildlife and biodiversity.
Semi-intensive living roofs are used to create a combination of a roof garden and an ecological landscape, planted using grasses, sedum, perennial herbs and small shrubs. They are more expensive than extensive living roofs and require more maintenance, but they provide the benefits of additional outdoor space as well as being beneficial to wildlife.