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Design factors for roof sheet leakage

1. “Technical Regulations for Steel Structures of Lightweight Houses with Portal Frames” stipulates: The slope of the roof of light-weight houses should be 1/8~1/20, and the larger value should be taken in areas with more rain. In the actual design project, due to the small slope of many engineering roofs, the rainwater on the high quality PPGI corrugated roofing sheet could not be discharged into the gutters in time, which caused the water in the house to cause water seepage.

2. The designer’s lack of understanding of the rainfall location of the project site is also an important factor causing the design of the roof slope to be too slow and the cross-section of the gutter to be too small. At present, in China’s steel structure design, different waterproof measures are adopted without considering regional climate differences.

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3. At present, most of the steel structure design drawings lack nodes and large-scale design drawings. The flooding edging is controlled by the construction unit at random. The roof is narrow and the height of the parapet is not enough. The position of the device is not proper or the height is not enough, which may affect the construction of the waterproof layer of the roof panel. It is easy to cause water seepage in these parts.

4. The design of the roof panel holes is not considered well. Try not to cut holes at the construction site, and it is difficult to make holes in the hole.

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