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上供下回单管顺序式供暖系统在多层住宅中应用广泛。近年来，为解决供暖系统横干管室内敷设影响检修和美观等问题，很多工程把横干管敷设在屋面上。实践证明这种做法会带来两个问题：第一，屋面防水问题。很多工程在立管穿越屋面处出现渗漏现象，而且这种情况很难维修好。...
The upper and lower single-tube sequential heating systems are widely used in multi-storey houses. In recent years, in order to solve the problems of overhauling and aesthetics in the installation of horizontal pipes in heating systems, many projects have laid horizontal pipes on roofs. Practice has proved that this practice will bring two problems: First, the problem of roof waterproofing. Many projects have leaked through the roof pipe, and this situation is difficult to maintain. ...