First, the housing structure design caused by leakage
1, the roof part of the color plate is too thin. After a period of use, the outer plate corrosion or deformation affected by temperature, the gap between the plate increases, resulting in leakage.
2, improper choice of plate type. What kind of direct use of self tapping screw connection type plate, even if the site is well handled, waterproof glue made in place, because the panel thermal expansion, cold contraction performance will appear leakage.
3, in the fierce market competition, the construction side to undertake the task, and a lower cost, in order to save raw materials, in the design of structure, reduce the housing slope, even some less than 1/20, resulting in the rain can not be discharged to the roof gutter, the roof area of water, water leakage caused by housing.
4, because of cost factors, pressure plate is used as the light steel housing, most with high low type (large effective area), and lap width less, when housing water, easy to diffuse through the plate joint, produce Water Leakage.
5, the lack of node design, construction units to choose the node, roof parapet height is not enough, the exhaust pipe, out of roof position or improper height is not enough, so that the influence of the waterproof layer construction is difficult, resulting Water Leakage.
Two, because of the material characteristics of water leakage:
1, special parts: due to the use of different materials such as steel parapets and connection joints, roof lighting belt and other parts, because of the stress changes are not synchronized, produce Water Leakage hidden.
2, in the steel structure system, because of the structure itself in the temperature change, under the wind, snow and other external force, it is easy to produce elastic deformation, produce displacement in the connection parts, and produce water leakage hidden danger.
3, the metal plate thermal conductivity, when the outside temperature changes, due to environmental temperature changes, resulting in color plate contraction deformation and produce large displacement at the interface due to temperature changes, so in the interface part of the metal roof plate is easy to produce Water Leakage risks.
Three, construction factors caused by leakage hazard:
1, the construction process of roof protection is not paid attention to, arbitrarily trample the roof, damage to the roof of the formation, and even cracks.
2, no corrosion. Some of the construction unit is anticorrosive gutter brushed with antirust paint or asphalt paint, after a period of time, serious corrosion.
3, steel structure factory building panel for large span roof panel, many cases have overlapping process, although in the joint use of polyurethane sealant and staple processing, installation is often very difficult to achieve the standard of design theory, lead to leak.
4, no slope lateral gutter. Leave a certain grade, at least 0.5%.
5 、 key node site construction careless. The root parapet overcast angle without the required production arc or arc is too small, the short side coiled material sealing, catchy white metal deformation, and the sealing materials and sealing points are fixed is not good.
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