The slope of the light steel structure roof is generally small, often below 6%, and the roof leakage phenomenon of this structure is more common in the central and southern rainy areas, with large area of water leakage, lighting windows and ridge joint drips. The reason for the formation of water leakage is not only the self-tapping screws, color steel plate (color steel accessories) lap, roof tile, heart-pumping rivets, the deformation of the color steel plate caused by people on the roof, and the rainproof glue falling off of the decorative parts such as lighting windows.
1. Water leakage at roof screws and fasteners. This phenomenon is more common, mainly in double-layer color steel plate and single-layer color steel plate roof. In the construction process, the tapping force is too heavy, too light, and the self-tapping rubber gasket may be deformed, falling off or forming a concave surface, resulting in a drip leakage on the roof and accumulation through the insulation cotton, accumulating a little bit to form a multi-point water leakage. In addition, the position of the self-tapping wire is not correct, and the purlin under the color steel plate is missed and the hole is directly formed is also one of the important reasons for water leakage. This water leakage phenomenon may not be obvious in the roof structure without insulation system of single-layer color steel plate, mainly because the rainwater is directly dispersed after leakage through the part where the steel plate is in contact with the purlin, and may not drip quickly.
2. Roof tile leakage. 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 rainfall is large, the splash of rainwater passes through the gap between the butt of the two color steel plates at the lower part of the ridge tile, forming a large area of leakage. To prevent rain leakage of ridge tiles, it is advisable to increase the length of ridge tiles in the construction, cut the corners of the tile waves, and glue the joints.
3. Water leakage at the lap joint of the color steel plate. Horizontal lap joints and vertical lap joints, color steel plate lap joints leakage, if the color steel plate tile wave is too low or the amount of rain is large and does not pass the tile wave, it is easy to form a large area of water leakage, and it is not easy to find the leakage point, once it is formed, it is not easy to repair. It is more common in curved roofs. The main reasons for this are that the lap between the two boards is not tight, and the self-tapping wire is not full, forming a gap, etc.
Steel structure roof waterproofing
