1.阳台排水立管宜与屋顶雨水排水立管合用这样改进后,即可以降低工程造价,又可美化建筑立面。有人认为,在屋顶雨水排水系统中,随着屋顶天沟水位的不断上升,雨水立管内频繁出现水塞现象,其实在现行设计中,以上海市一套建筑面积为100ｍ2的住宅为例,南北阳台各设一根ＤＮ100ｍｍ单 1. Balcony drainage riser and rainwater drainage roof should be combined with such improvements, which can reduce project costs, but also landscaping building facades. Some people think that in the roof rainwater drainage system, as the roof gutter water level rises frequently, the phenomenon of water plug frequently appears in the rainwater riser. In fact, in the current design, taking a residential area of ​​100m2 in Shanghai as an example, Each balcony a DN100mm single