1. Laying the first board: first locate the first board, and fix the position of the
low cost Galvanized Corrugated Steel Sheet according to the layout drawing and the corresponding hole position on the purlin. The first low cost Galvanized Corrugated Steel Sheet is installed from the east side gable near the gutter, and is laid from east to west. Installed.
2. When the profiled steel plate is connected with the purlin, it is fixed by 5.5*30 self-tapping screws with waterproof gasket. The fixing point should be set on the trough, and the self-tapping screw is fixed in the valley, and the length direction is 350mm. When fixing, the manual operation is moderate, and it is not appropriate to fix the self-tapping screws too tight or too loose to prevent the formation of gaps.
3. The lap joint of the Galvanized Steel Roofing Sheet:
China supply Galvanized Steel Roofing Sheet is connected by self-tapping screws, and the sealant is sealed at the joint to prevent leakage, so that the joints are tightly and smoothly engaged.
When the lap joint is made, the two pressed steel plates are lapped one by one, and the lap joint is fastened with a self-tapping screw with a waterproof rubber pad. When longitudinal lap joint is required, the two profiled steel plates are overlapped and overlapped, and the lap length is about 250 mm. After the lap joint, the self-tapping screws are used for fixing.
4. When laying the Galvanized Steel Roofing Sheet, the lap joint of the adjacent two plates should be overlapped according to the maximum frequency wind direction (the dominant wind direction is the southeast wind), which can avoid the cold air being poured into the room during windy.
5. The ridge is laid from the side of the gable. It is fixed with a 5.5*30 self-tapping screw and a purlin. The fixing of the purlin and the profiled steel plate is strict and straight.
