With the arrival of winter, the cold has greatly tested the frost resistance of metal roofs of industrial and commercial plants. We all know that the minimum temperature of metal roofing in winter can reach minus 10, how to prevent the metal roof from cracking and peeling under severe cold conditions, resulting in rust on the metal roof, which can not play a real protective role, what do you need to pay attention to in the renovation and repair of metal buildings in winter?Xiao Mo will analyze them for you one by one.
Precautions for the renovation and repair of metal buildings in winter
1. Pay attention to the weather conditions. Be sure to pay attention to the local weather conditions before embarking on a renovation. The temperature is low in winter, and the construction time should try to avoid the low temperature in the morning and evening, and it is suitable to work at noon, and choose a clear, rainless and snow-free weather for construction to ensure the smooth progress of the renovation and repair work.
2. Pay attention to weather conditions such as dew and frost to avoid the paint film being eroded by dew before it dries out, causing the paint film to be stained by water traces.
3. Pay attention to keeping warm. When the temperature is lower than the temperature specified by the state, outdoor operations should be stopped. The low temperature in winter can easily lead to incomplete solidification of the refurbishment paint of color steel tiles, so the surrounding environment temperature should be appropriately increased under the premise of ensuring safety during the construction process, so as to achieve a better anti-corrosion effect.
4. In the repair process, the characteristics of metal materials, such as thermal conductivity and ductility, should be fully considered, and appropriate construction methods and tools should be selected on this basis.
Professional refurbishment process
Grinding and rust removal
1. Clean up the residual garbage, dust and debris on the surface of the metal roof. After cleaning, the first fine grinding is carried out, and an electric grinder-type wire brush is used to polish the original peeling paint film until the original rust layer is seen.
2. Use a road hair dryer to clean the floating dust and oil on the surface of the metal roof. Then the second fine grinding is carried out, and the rust scale and oxide are sanded clean with an electric grinder-type wire brush. And here the floating dust and oil on the surface of the metal roof are cleaned.
3. The construction personnel of Moyi Zhuneng will confirm the material of the good color steel tile before grinding, and use professional polishing, with no visible grease and dirt on the surface, and no attachments such as oxide scale, rust and paint coating that are not firmly attached.
4. At the same time, according to the effect of grinding, the number of times of grinding will be increased or decreased as appropriate. For the environmental requirements of grinding, the temperature should be greater than 3 and the humidity should be less than 80%.
5. After grinding, the base layer should be comprehensively cleaned and cleaned to ensure the cleanliness of the surface before spraying the primer.
Inspect and spot the patches thoroughly
1. Glue and seal the old nail holes. Remove the aging sealant remaining in the original nail hole, polish and remove the rust of the nail hole, and repair the nail hole with butyl or asphalt tape and fix it with screws again. Finally, the nail hole is glued and sealed with metal weather-resistant glue, and the glue surface is full and seamless without foaming.
2. Seal and glue around the ventilation ball. Paste and repair with butyl or asphalt tape, the intersection of the edge of the tape laying and the roof panel should be firmly bonded, and sealed with metal weatherproof adhesive. It is worth noting that the horizontal and vertical parts of the tape when the direction of laying changes should be firmly bonded on both sides of the turning part.
Spray Moyi color steel tile anti-rust repair paint
1. Under the condition of ensuring that the base is clean, dry and dust-free, the metal roof and parapet of the color steel tile are renovated and repaired, and the color steel tile anti-rust repair primer specially developed by Moyi Group is used for spraying, which requires uniform spraying, no bottom-penetration, and no sagging.
2. After the primer is dried, spray the anti-rust repair topcoat of Moyi color steel tile, and the topcoat is required to be sprayed evenly, without penetrating the bottom, without sagging, and without color difference.