What is Galvannealed Steel?

The zinc-iron alloy coating on high quality Galvanized Corrugated Steel Sheet behaves very differently than the soft galvanized coating. During fabrication, there is almost always some degree of powdering of the coating. Heavier coatings will exhibit more powdering. For this reason, typical galvannealed coatings are thinner than most galvanized coatings. Since galvannealed product is intended to be painted, a thinner coating can be successfully applied to provide long product life.

As stated previously, galvannealed sheet is specifically designed to be used in the painted condition and can be readily postpainted, i.e., painted after fabrication of a part. It is not intended to be prepainted, i.e., painted in coil form and then formed into a shape. The brittle nature of the coating makes forming after painting a difficult task to avoid degradation of the corrosion performance in subsequent service.

How to scientifically maintain color steel sheet

1. In order to prevent long-term residence of roof corrosion, the user can use the cleaning method to maintain the high quality color corrugated steel sheet. In the seaside and industrial contaminated areas, the maintenance period should be shortened. Maintenance by cleaning method, do not use decontamination powder or industrial detergent (which will damage the coating), and can be determined after a small area experiment with household detergent.
2. After the color coated plate is used for a certain period of time, due to factors such as sunshine, rain, oxidation, etc., the coating is inevitably degraded by powdering. In order to maintain the structural life of the building, repainting and repainting is a good choice. When the powdered surface of the high quality color corrugated steel sheet turns gray, it is the best time for recoating. Recoating should be carried out as much as possible during the drying period with less moisture.
Well, the above are some tips for the scientific installation and maintenance of color steel roofing. Have you mastered it?

Roof Sheet Waterproofing Method

Detail additional layer:
China supply Galvanized Steel Roofing Sheet, the sheet is hand-painted with a thin layer of high-elastic waterproof coating of Hao Shi Tu roof and then laid a mesh cloth to ensure that it is flat, without wrinkles and curling. Finally, the upper part of the mesh cloth is painted with a high-elastic waterproof roof paint, completely covered with mesh.

Large surface painted waterproof coating:
The high quality Galvanized Corrugated Steel Sheet is painted with a high elasticity, and the thickness of the roof is 1.5mm. It is required to be thinly coated many times. After each time the waterproof coating film is completely dried, the next coating process is carried out.

Color coating sheet installation points

Installation
The surface of the China color-coated corrugated roofing sheet must not allow metal chips, cuttings, chips and other metal objects such as rivets and fasteners to remain, because the metal residue will cause rust after being eroded. Once discovered, these residues should be removed immediately from the roof or at least after the end of each day of construction. Avoid walking on it to avoid damaging the paint film. In the case of strict requirements, the building shall be inspected within 2 weeks of installation to remove residual substances that may rust. Removing the residue at this point will help the roof look long.

Release film
A portion of the PPGI corrugated roofing sheet for sale is coated with a specially designed transparent organic film. The organic film can protect the corrugated roofing sheet coating from scratches during storage and transportation, but it needs to be removed immediately after the installation. The sunlight will enhance the adhesion of the organic film and the surface of the corrugated roofing plate. Therefore, it is necessary to cover the surface of the color plate to avoid direct sunlight.

How to transport roofing sheet

The high quality PPGI corrugated roofing sheet produced by the prefabrication plant shall be transported to the site by means of transportation. The choice of mode of transport should be based on the size and weight of the part, the number of parts and the distance traveled, and the specific conditions of the existing transport vehicle. Determine after comparison. The roof panels are usually transported by car and flatbed trailers and the components are transported directly to the construction site.

During the transportation of the high quality color corrugated steel sheet, the components must be protected from deformation, non-dumping, and damage; the transport road should be flat and sturdy, and the speed should be determined according to the road conditions to maintain smooth operation.

The loading and unloading of the roof panel should be stable, the transportation should be firmly fixed to avoid dumping; during the transportation process, the position of the component mat should be correct, and the loading and unloading roof panel should meet the design requirements. Transportation work should be organized reasonably and should be lifted first and provided in the order of lifting.