1.What are the inspections and preparations before treatment?
Determine the cause of the warping:
Installation problems: loose screws, too large fixing spacing, uncompacted joints.
Material aging: rusting of steel plates, shrinkage of core materials, cracking of coatings.
External forces: pulling by strong winds, deformation due to impact, and stress concentration caused by thermal expansion and contraction.
2.How to deal with slight warping?
Clean the dust, rust, and aged sealant from the raised parts, and use sandpaper to polish the surface of the steel plate until it is smooth.
Align the raised edges, and re-install self-tapping screws near the original fixing points. The screws need to be covered with rubber gaskets and tightened until the steel plate fits the base.
Apply sealant along the joints, compact and scrape flat to ensure that the glue layer completely covers the gaps, and avoid rain within 24 hours.
3.How to deal with moderate warping?
If the steel plate is warped due to deformation, first use a rubber hammer to gently tap the deformed part and try to restore it to flatness (avoid excessive force and cause breakage).
Remove the original loose screws and add fixing points in the deformed area (the spacing is controlled at 30-50cm, which is denser than the normal spacing). The screws need to penetrate the steel plate and the base keel to ensure firmness.
For composite panels, if the core material (such as rock wool, polystyrene) shrinks due to water ingress or aging, the damaged core material at the warped part needs to be cut off, filled with new core material, and covered with a steel plate patch of the same material, fixed with rivets around the periphery (spacing 10-15cm), and then sealed with sealant.
4.How to deal with severe warping?
Remove the color steel plates that are warped and damaged around (pay attention to the position of the fixing screws to avoid damaging the adjacent intact plates).
Check whether the base keel is rusted or loose. If there is a problem, repair it first (replace the rusted keel and reinforce the loose nodes).
Install new color steel plates, ensure that the overlap length with the adjacent plates is ≥10cm (overlapping in the wind direction is more waterproof), the spacing between the fixing screws is 20-30cm, and the edges and joints are sealed with sealant. If necessary, add a supporting keel under the plate to enhance stability.
5.What precautions should be taken in special scenarios?
Warping of color steel plate on roof: It is necessary to operate in windless weather, and fasten the safety rope during operation to prevent falling. If it is caused by typhoon or strong wind, it is necessary to check whether the overall structure is stable to avoid secondary damage. The fixing screws should be tilted 5°-10° toward the ridge to enhance wind resistance.
Warping of color steel plate on wall: If it is close to the ground, it is necessary to check whether it is caused by ground settlement, and adjust the bottom support if necessary. The sealant at the joint should choose a weather-resistant product (such as silicone glue) to avoid aging and cracking caused by direct sunlight.
Warping caused by rust: It is necessary to remove the rust first (with sandpaper or rust remover), apply anti-rust paint after exposing the original color of the metal, and then fix and seal it to prevent the spread of rust.