The cost of water proofing system is increased to save the roof from constant watering and root damaging effect by green roofing system.Green roofs comprise a multi-layered system that covers the roof of a building or podium structure with vegetation cover/landscaping.The maintenance of roof is costly after installation of green roofing system.For this increased load, more strength of structure of the building is required. The weight of soil and vegetation is born by roof slab.In case of large building one can get flowers, vegetables etc.Also the green roofing system presents economic and environmental benefits in metropolitan cities.In flat green roofing, the space is used for recreation and meetings etc.Green roofing also create good environment in surrounding of the building.At rainy time, vegetation and plants of green roof observe water and reduce load on storm water system.This roofing system reduces energy cost for maintenance of temperature of building.Green roof keeps temperature down which saves the cost of insulation.Extensive green roof system is typically used by local authorities or by public access organization which are opening their green roofs as a green space for people to visit. The in extensive green roofing is comparable with roof garden and this is designed to access and therefore to be walked on larger shrubs and trees planted in this system. This roof system is low in maintenance cost because it is not designed to be on regular basis. This type of green roofing systems is planned with low growing plants such as mosses and succulents. In this type of green roofing system need more attention in selection of plants and used for public accessability.Įxtensive green roof system is designed for their aesthetic and environmental benefits, which is not typically designed for walking on.This type of roofing system is heavier and requires more structural supports.Built up in place system green roofing has typically loading ranging from 16-40 Kg.This type of roofing needs accurate design planning and is entirely finished before construction begins because green roof installation can not be changed easily.This type of roofing is typically used.This system of green roofing is expensive and even more complicated.Modular system has overall success in green roof because survival rates of vegetation are higher.It can be installed at any time throughout the year as vegetation is available pre- planted.Growing medium usually contains sand, peat, gravel, organic matter, crushed bricks and some soil.This system is light in weight and has 6 to 8 Kg.Green roof and maintenance process is very easy.In modular system the depth of soil ranges from 3 cm to 15 cm.This system is simple and easy to install.The maintenance in built-up system requires regular watering, weeding, cultivation for survival of green roof.Īccording to cutting-edge research, green roof are divided into four categories as mentioned belows:
Depending on the size of green roof and types of plants, vegetations may need one or two growing seasons to be fully grown. It includes vegetations, growing medium, drainage irrigation system, water-proof installation and roof access are installed one by one on the top of roof slab. Green roof construction takes 30 to 40 days’ time for development. Green roof improves environment specially city’s, mitigate and storm water problem. Green roof has great effect such as it keeps temperature down particularly in urban areas where building proportion is more greening of the roof which has high impact for maintaining good environment. Sometimes the roof having green technology is termed as ‘green roof’ such as water pool with green water, solar panels. Painting merely by green color on the top of roof does not refer to green roof. pots are placed with green plants on the roof but this is not really a green roof.
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