There are two forms of roof drainage in buildings. One is that rainwater can be drained to any direction in the roof. This form of drainage is called free drainage in buildings. The other is to collect rainwater through the slope of the roof and gutter, and then drain the rainwater to the outdoor ground through the  water outlet and the downpipe. This form of drainage is called organized drainage in the building. The purpose of the downpipe is to The roof rainwater is discharged in a timely and smooth manner. Therefore, specific requirements should be made for the construction of the downpipe.

We know that the maximum catchment area of a downpipe on the roof should be less than 200m2. Excessive catchment area can easily prevent roof rainwater from being discharged to the outdoor ground in a timely and smooth manner. At the same time, it will also increase the roof drainage slope and increase roof load. . The number of downpipes should be determined. Generally, it should be specified by the design. The construction company should strictly follow the design requirements for construction. However, sometimes the location of the downpipe affects the function of the building, such as hindering the opening of doors and windows. Therefore, not only the main parts such as the structure but also the detailed methods such as the downpipe should be thoroughly studied in the plan review. Once it is found that the detailed practices conflict with other parts, the designer should be asked to confirm.

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