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“Vegetative roofs, also known as green roofs, are thin layers of living vegetation installed on top of conventional flat or sloping roofs.1‘We have chosen to use the word “vegetative” rather than the word “green” in this guide because a non-vegetative roof could be considered to be environmentally “green” without being vegetative. For example, due to it being white and therefore mitigating heat gain within the building and reducing heat island contribution, a white non-vegetative roof might be considered as being “green” or environmentally friendly. In other words, “green” has too broad of a connotation to be clear for use in this guide, and we recommend that the industry adopt the nomenclature “vegetative,” rather than the overly broad “green.” Source: wbdg.org

Other names you might hear are:

1.  Eco roofs
2. Living roofs.
Where they can be used:
Commercial Buildings
Residential Buildings
Industrial Buildings