Introduction
Galvanized colour coated roofing sheet is a steel roofing material made from galvanized steel sheets coated with protective paint layers. It is widely used in residential, commercial, and industrial roofing industry.
| Tolerance | ±1% |
| Zinc coating | 30-275g/m2, according to customer's requirement |
| Certificate | JIS, ISO9001, API , BIS, Gs |
| Surface | Hot-dip Galvanized |
| RAL Color | Can be customized |
| Length | 1.0m-12.0m, customized |
| Width | 4.0cm-2.4m, customized |
| Thickness | 0.1-10mm,according to customer's requirement |
| Technique | Hot-dipped galvanized |
| Applications | home appliance, building material, machinery, roofing sheet, metal roofing, container panels, etc. |
Manufacturing Process
The production process of galvanized coated sheet mainly consists of the following steps:
Base material preparation: Firstly, select high-quality cold-rolled steel plates as the base material, ensuring that the surface is smooth and free of impurities.
Hot-dip galvanizing: The steel plate is immersed in molten zinc liquid, allowing the zinc layer to evenly adhere to the surface of the steel plate, forming a protective film. This process is the core technology of galvanized coated sheets.
Surface treatment: Cleaning and pre-treatment are carried out on the galvanized layer to enhance the adhesion of the coating.
Painting: The colored paint is evenly applied to the galvanized layer through spraying or roller coating methods. The paint usually has excellent weather resistance and corrosion resistance.
Drying and curing: Finally, the coating undergoes drying treatment to achieve curing, thereby enhancing its durability.
Features
- Lightweight but Strong Structure
Compared with traditional roofing materials, colour coated roofing sheets are lightweight while still providing good structural strength, making them easier to transport and install.
- Excellent Weather Resistance
The protective coatings help the sheets withstand sunlight, rain, and temperature changes, making them suitable for long-term outdoor use.
- Energy Efficiency: The color coating can be customized with heat-reflective pigments (e.g., cool white), reducing roof surface temperature by 5-8℃ in summer and lowering indoor cooling energy consumption by 15-20%.
- Easy Installation: The uniform rib structure and customized size allow quick overlap and fixing, suitable for both new roof construction and old roof renovation projects.
Specifications and tolerances
Dimension deviation: Length deviation is within ±5mm, width deviation is within ±2mm, thickness deviation is ±0.5mm, and diagonal deviation is no more than 5mm.
All ribbed structures are formed via high-precision roll forming machines, ensuring uniform rib height, smooth edges, and no deformation after long-term use.
Customization Services
We provide flexible customization options to meet different roofing project requirements, including rib design, size, and material selection.
- Rib Design Customization
Various rib types such as trapezoidal, corrugated, and step profiles are available. Rib height (10–100 mm), spacing (100–400 mm), and density can be adjusted to improve roof strength, drainage performance, and load capacity.
- Size and Thickness Options
Roofing sheets can be produced in custom lengths from 2–12 m and widths from 1000–1250 mm to match specific roof dimensions. Base steel thickness ranges from 0.2–1.2 mm to suit both lightweight residential roofs and heavy-duty industrial structures.
- Material and Coating Selection
Customers can choose galvanized steel or galvalume steel as the base material depending on environmental conditions. Multiple coating options such as polyester and PVDF are available, with over 50 standard colors or customized colors based on RAL or Pantone codes.
Packing &Delivery
FAQs
1. Can galvanized colour coated roofing sheets be used for wall cladding?
Yes, in addition to roofing, these sheets are also widely used for wall cladding in industrial buildings, warehouses, and commercial structures.
Yes, in addition to roofing, these sheets are also widely used for wall cladding in industrial buildings, warehouses, and commercial structures.
2. How are colour coated roofing sheets typically transported?
They are usually stacked and secured with protective packaging to prevent scratches, deformation, or coating damage during transportation.
They are usually stacked and secured with protective packaging to prevent scratches, deformation, or coating damage during transportation.
3. What factors should be considered when choosing roofing sheets?
Important factors include sheet thickness, coating type, profile design, environmental conditions, and the expected service life of the building.
Important factors include sheet thickness, coating type, profile design, environmental conditions, and the expected service life of the building.
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