4 technical requirements 4.1 green roof green roof proposal targets of different types of green roofs should be different from the design, Qingtongxia north roof garden, green roof ecological benefits of green to play, there should be appropriate area index as a guarantee. Green roof advisory indicators in Table 1.4.2 green roof roof bearing security should advance a comprehensive survey indicators and technical data of the building, according to the load-bearing roof, accurate accounting of the weight of construction materials and a number of accommodated tourists. Plant material and planting average load load Reference Table 2.4.3 Roof Protection Safety green roof should set up an independent entrance and safe passage to the north roof garden plants, when necessary, set up special staircases. In order to prevent high-altitude falling objects and ensure the safety of visitors, but also set the height of 80cm above the guard rail on the roof perimeter. At the same time pay attention to the safety of fixed plant and facilities. 4.4 green roof construction green roof construction is generally divided into five levels, from the roof of the building in order to root puncture-resistant waterproof layer, row (reservoir) water layer, isolation filter layer, the substrate layer, planting layer. 4.4.1 root puncture-resistant waterproof layer can be used rigid waterproof, flexible waterproof or waterproof coating material in three different methods, northern roof garden pieces, should two or two above the waterproof layer fortification, north roof garden drainage, most waterproof layer on the Road It must be puncture-resistant waterproof material. Material waterproof layer should be compatible, generally reasonable service life not less than 15 years. Either form of roofing membranes and materials used, constitutes the entire roof waterproofing and drainage systems, plumbing everything you need, flue, drain holes, embedded iron and the roof pillars and other facilities should be doing roofing When properly handled well its node layer structure, with particular attention to parts of the connecting portion of the soil and drains the water ends. Overall rigid waterproof layer is often due to the construction of these small nodes handled properly, causing the failure of the entire roof waterproofing. In addition, according to conventional Sets the aspect dividing joint, complex structures easily leak. When installing waterproof board, waterproof board when a width is not enough, you need a few pieces arranged side by side, it should pay attention to the gap between the board and the board will also provide the potential for root growth space. Northern roof garden style, Shaanxi View source landscape design (certification), north Shaanxi View source provided by the roof garden landscape design 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.