2. waterproof and root resistance there are now domestic water after two to three years time in many green roof projects as roof leaking, Shandan green roofs, the shortest less than a year there have been roof leakage. Obviously leakage occurs less than a year, the great possibility is that the original waterproofing system is not perfect, waterproof material inappropriate choice or waterproof construction process safeguards do not good enough, eventually leading to the destruction of water system ??? Of course, there is a possibility that the initial waterproofing system and the construction process without any problems, but the roof garden and put into use in the future, other factors have contributed to the destruction of the water system. So what factors cause such waterproof failure? And a roof garden is not to use the next two to three years with a waterproofing system damage is the reason? For roofing system, planted roof above the casing is the protection of waterproof material, soil effective protection of the waterproof material is not natural conditions of wind and sun. As early as one thousand years ago, Babylon on the roof covering the soil to achieve the purpose of waterproof, of course, they will not plant any plant in the roof soil. For modern green roofs in terms of what caused the destruction in a short time? For waterproofing system damage European studies have a special plant roots planted roof waterproofing system in seventy years ago, and many countries in the twenty Century has set up a special research institute green roofs. Plant roots on the waterproofing system hazards: root grasses are well-developed and strong penetration, damage to the waterproof layer and the structural layer as much as shrubs and trees. 7 Green Roof Maintenance and Management 7.1.1 7.1 irrigation water should be timely and appropriate based on the habits of trees. 7.1.2 Irrigation should be based on climatic conditions. Summer generally in the early morning or evening watering, Lanzhou, green roofs reduce bath, winter watering is generally at noon. 7.1.3 irrigation facilities have good performance, non-drop interface, seepage, leakage phenomenon; to ensure the smooth flow of drainage channels for timely drainage. 7.1.4 Irrigation water should not exceed planting border, Lanzhou green roof waterproof, should not exceed the height of the roof parapet, after irrigation, watering facilities should be closed. 7.2 In addition to pruning should be based on "Xi'an green conservation management standards" for conservation, the Lanzhou green roof sketch must be strictly controlled plant height, sparse density, root to shoot ratio and maintain appropriate water and nutrient balance, to ensure the safety of green roofs. Lanzhou green roof design _ Shaanxi View source landscape design (certification) _ Shandan green roof provided by the Shaanxi View source landscape Engineering Limited. Shaanxi View source landscape Engineering Co., Ltd. (www.gyu-la.com) is Xi'an, creative design leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Shaanxi View source landscape design leadership with the staff warmly welcome all inquiries negotiations to create Shaanxi View source landscape design a better future.