There are many preparatory work before metal roof waterproofing, especially the rust on the surface of metal roof needs to be paid attention to. If the preliminary work is not done in place, the later work will be impossible. And the anti-rust work in the early stage has a very important influence on the success or failure of the waterproof work in the later stage.
Determine the area to be waterproofed:
Metal roofs generally have the following areas to be waterproofed: horizontal laps, vertical laps, fan outlets, extended roof pipes, air-conditioning pipes, around daylighting panels, roof ridges, gutters, metal plate and parapet junctions, screw fasteners, etc. The weak link of metal roof waterproofing. Pretreatment:
Check the metal roof carefully before construction to ensure that the metal roof is firm, clean, free of rust, and free of frozen objects. If the above conditions are not met, the following treatments should be made:
1. The working surface should be carefully cleaned during construction. It is necessary to ensure that the base surface firmware is not loose, rusted, oil-free, dust-free, and water-free to keep it clean.
2. The loose firmware on the roof must be replaced or reinforced, the rusted firmware should be replaced, and the firmware should be added at the appropriate position.
3. If the base surface is corroded, it is necessary to apply a water-based metal anti-rust and anti-corrosion paint that does not require manual grinding and rust removal.
4. For the oily, dusty, and bright water on the base surface, it needs to be scrubbed clean to remove frozen objects, dust and other dirt.
5. Determine the parts that need to be waterproofed and the width of the waterproof layer, and cut the ribs of the corresponding width. The width of the waterproof layer, the area of the screw waterproof layer is generally 0.01 square meters (10cm×10cm); the width of the horizontal overlap waterproof layer is 20cm; the width of the vertical overlap waterproof layer is 15 cm; the width of the overlap waterproof layer on both sides of the roof is 20 cm, etc. , The width of the waterproof layer is best determined according to the height of the roof tile crest on site and the construction requirements.
