做防水试验和保证良好的排水系统建造屋顶花园,必须进行二次防水处理。首先，要检查原有的防水性能:封闭出水口,再灌水,进行96小时(4天4夜)的严格闭水试验。闭水试验中,要仔细观察房间的渗漏情况,有的房屋连续闭水3天不漏,第四天才开始渗漏。若能保证96小时不漏,说明屋面防水效果好。这种防水效果,也可适用于非屋顶花园的情况。防水层是保证屋顶不漏的关键技术问题,但屋顶防水和排水是两个方面,因此还必须处理好屋顶的排水系统。在屋顶园林工程中，种植池、水池和道路场地施工时，应遵照原屋顶排水系统,进行规划设计，不应封堵、隔绝或改变原排水口和坡度。特别是大型种植池排水层下的排水管道,要注意相关的标准差，使种植池排水层下的排水管道与屋顶排水口配合，同时注意相关的标高差，使种植池内的多余灌水能顺畅排出。
To conduct waterproof test and ensure good drainage system, secondary waterproof treatment must be carried out for the construction of roof garden. First of all, check the original waterproof performance: close the water outlet, then fill water, and conduct a strict closed water test for 96 hours (4 days and 4 nights). In the closed water test, carefully observe the leakage of the room. Some houses do not leak after closed water for 3 days, and the leakage begins on the fourth day. If no leakage can be ensured for 96 hours, it indicates that the roof waterproof effect is good. This waterproof effect can also be applied to non roof gardens. Waterproof layer is the key technical problem to ensure that the roof does not leak, but roof waterproof and drainage are two aspects, so we must also deal with the roof drainage system. In the roof garden project, during the construction of planting pond, pool and road site, the planning and design shall be carried out in accordance with the original roof drainage system, and the original drainage outlet and slope shall not be blocked, isolated or changed. In particular, for the drainage pipeline under the drainage layer of large-scale planter, pay attention to the relevant standard deviation, make the drainage pipeline under the drainage layer of planter cooperate with the roof drainage outlet, and pay attention to the relevant elevation difference, so that the excess irrigation in the planter can be discharged smoothly.
不损伤原防水层实施二次防水处理,最好先取掉屋顶的架空隔热层，取隔热层时，不得撬伤原防水层。取后要清扫、冲洗干净,以增强附着力。在一般情况下,不允许在已建成的屋顶防护水层上再穿孔洞、管线或预埋铁件与埋设支柱。因此,在新建房屋的屋顶上建屋顶花园时,应由园林设计部门提供屋顶花园的有关技术资料。如:将欲留孔洞和欲埋件等资料提供给结构设计单位,并由他们将有关要求反映到建筑结构的施工图中，以便建筑施工中实现屋顶花园的各项技术要求。如果在旧建筑物上增建屋顶花园,无论是哪种做法的屋面防水层,均不得在屋顶上穿洞打孔、埋设铁件和支柱。即使一般设备装置也不能在屋顶上“生根”,只能采取其他措施使
Do not damage the original waterproof layer and carry out secondary waterproof treatment. It is best to remove the overhead thermal insulation layer of the roof first. When taking the thermal insulation layer, do not pry the original waterproof layer. Clean and rinse after removal to enhance adhesion. In general, it is not allowed to pass through holes, pipelines, embedded iron parts and embedded pillars on the built roof protective water layer. Therefore, when building a roof garden on the roof of a new house, the garden design department shall provide relevant technical data of the roof garden. For example, provide the data such as holes and embedded parts to the structural design unit, and they will reflect the relevant requirements into the construction drawings of the building structure, so as to realize the technical requirements of the roof garden in the building construction. If a roof garden is added to an old building, no matter what kind of roof waterproof layer is used, holes shall not be drilled or iron parts and pillars shall be buried on the roof. Even ordinary equipment and devices can not "take root" on the roof, and other measures can only be taken to make it
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