What is a green roof?
A living or green roof is a roof, deck or other structure onto which vegetation is intentionally grown or habitats for wildlife are established.
Types of green roof
Traditionally there have been three broad classifications for green roofs - extensive, semi-intensive and intensive. However, whilst biodiverse roofs share many of the characteristics of an extensive roof, their increased specification merits a distinctly separate category.
Can include characteristics of both Extensive and Biodiverse roofs. Typically requiring a deeper level of substrate, a wider range of plants can be included such as shrubs and woody plants. Irrigation and maintenance requirements are dependent on the plants chosen.
Often referred to as a roof garden that provide similar benefits to a small parks or domestic garden. Designed predominately for recreational use, intensive roofs often require regular maintenance and irrigation.
Is similar in composition to an extensive roof, but is designed specifically to create a habitat that will attract a particular plant species, insects and birds, by replicating or creating a habitat. This type includes a brown roof, which is a low-vegetated version. The growing medium is purposely-selected to allow plant species to inhabit the roof over time.
Serve as an ecological covering that provides society with environmental benefits and the building owner with life cycle cost benefits.
A lightweight, low-maintenance roof system, typically with sedums or other hardy plant species planted into a substrate/growing medium that is low in nutrients. Irrigation is not normally required once the green roof has established.