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Maintenance method for leakage of color steel plate roof(1)

Update:29 Nov 2019
Summary:

The slope of the color steel plate roof is generally sm […]

The slope of the color steel plate roof is generally small, often below 6%. This kind of structure seepage is more common in areas with heavy rain in Central and South China. There are large-scale seepage, leakage of lighting windows and roof ridges. It is necessary to understand and analyze its structure, leakage point and cause when treating the leakage of color steel sheet roof.
 Generally speaking, the leakage of color steel plate roof is mainly caused by self-tapping screws, color steel plate overlap, ridge tiles, heart rivets, deformation of color steel plate caused by people on the roof, and rainproof rubber off of decorative parts such as lighting windows. . The corresponding leakage points can be divided into the following points:
1.Water leakage at roof screws and fasteners
This phenomenon mainly occurs in double-layer color steel sheets and single-layer color steel sheet roofs. During the construction process, the tapping force is too heavy and light, and the self-tapping rubber skew, skewing, etc. may deform the self-tapping rubber gasket, Falling off or forming a concave surface, causing the roof to leak water and accumulate through the insulation cotton, accumulating less and increasing, forming multiple leaks. In addition, the self-tapping position is not correct, and the holes formed directly by missing the purlins under the color steel plate are also one of the important reasons for water leakage. This kind of water leakage may not be obvious in the roof structure of the single-layer color steel plate without a heat insulation system, mainly because the rainwater directly disperses after leaking through the part where the steel plate contacts the purlin, and may not necessarily drip quickly.
2. Leakage at the overlap of color steel plates
Horizontal lap seams and vertical lap seams, where water leaks at the overlap of the color steel plates. If the color wave of the steel plates is too low or the amount of rain is not large enough, it is easy to form a large area of water leakage. Not easy to repair, this situation is more common in curved roofs. The main reason is that the overlap between the two boards is not tight, and the self-tapping has not been filled to form a gap.
3. Roof tile leaks
In the construction of light steel structure roofs, water leakage caused by roof tiles is also a relatively common phenomenon. In the rainy season, especially when the amount of rain is large, the splash of rain water passes through the gap between the two colored steel plates at the bottom of the ridge tile, forming a large area of leakage.