roof covered with vegetation either completely or partially. Three types of green roof: extensive (shallow), semi intensive (moderate) and intensive (deep) green roofs. History traces back to the Hanging gardens of Babylon. Germany is the birthplace of modern day green roofs. a green roof has seven different layers: waterproofing membrane, root barrier mambrane, protection layer,drainage layer,filter layer, media and the vegetation/plant layer. advantages include reduce energy consumption and urban heat island effect, air pollution, storm water mitigation, noise reduction and aesthetic beauty.