Green roofs are divided based on depth of planting and the maintenance of the roof. There are two types of green roofs available: extensive and intensive.
Extensive green roofs are suited to roofs (Light weight roof decks, inaccessible roofs, flat or sloping roofs, reducing water run-offs) which bear less capacity of load. Here on these green roofs, only low growing plants can be vegetated. Soil used for extensive green roofs are made of thin layers and not very deep. So, for these reasons we cannot grow larger plants. Drought-tolerant plants are well suitable for planting on these roofs. Even plants such as mosses, succulents, herbs and grasses create pleasant plant vegetation. It requires minimum maintenance because these are designed in self-sustaining community. The size of extensive green roof layer is about 50-150mm or less than 6”. it is easy to install and simple in design. There is no need of irrigation required.
Intensive or active green roofs are suited for roofs which bear more capacity of load. The height of the intensive green roofs can be 150 to 1500 mm or (6” to 12” and greater). These roofs have a deep growing medium that supports a variety of landscape design and wide range of plants and trees. Lawn, shrubs, edible plants, grasses, small deciduous trees and conifers are possible on green roofs. These require irrigation, feeding, and other maintenance because they are labor-intensive. Even walkways, benches, playgrounds or even ponds can be established as additional features on the roof. There are no limitations in design and individuality, but a few things have to be considered. This requires high cost.
Extensive green roofs are suited to roofs (Light weight roof decks, inaccessible roofs, flat or sloping roofs, reducing water run-offs) which bear less capacity of load. Here on these green roofs, only low growing plants can be vegetated. Soil used for extensive green roofs are made of thin layers and not very deep. So, for these reasons we cannot grow larger plants. Drought-tolerant plants are well suitable for planting on these roofs. Even plants such as mosses, succulents, herbs and grasses create pleasant plant vegetation. It requires minimum maintenance because these are designed in self-sustaining community. The size of extensive green roof layer is about 50-150mm or less than 6”. it is easy to install and simple in design. There is no need of irrigation required.
Intensive or active green roofs are suited for roofs which bear more capacity of load. The height of the intensive green roofs can be 150 to 1500 mm or (6” to 12” and greater). These roofs have a deep growing medium that supports a variety of landscape design and wide range of plants and trees. Lawn, shrubs, edible plants, grasses, small deciduous trees and conifers are possible on green roofs. These require irrigation, feeding, and other maintenance because they are labor-intensive. Even walkways, benches, playgrounds or even ponds can be established as additional features on the roof. There are no limitations in design and individuality, but a few things have to be considered. This requires high cost.
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