A green roof or living roof is a roof that is partially or entirely overlaid with vegetation planted over a waterproofing layer. It may also incorporate extra covers such as a root layer and drainage or irrigation systems.
Green roofs are used for proposes such as intercepting rainwater, contributing with insulation, creating an environment for wildlife, minimizing the stress by giving a more aesthetically pleasing view, reducing urban temperatures, and moderating the “Heat Island Effect”.
There are two types of green roofs: Intensive Roofs and Extensive Roofs.
Intensive Roof is thicker, with a minimum depth of 12.8 cm (5 1⁄16 in), and can sustain a more extensive type of plants but are heavier and need more care.
The Extensive Roof is shallow, reaching in depth from 2 cm (13⁄16 in) to 12.7 cm (5 in), lighter than the intensive one, and demands minimal care.