AS 1397 G550 Full Hard Corrugated Galvanized Roofing Sheet with 76mm Wave Profile and 40–275g/m² Zinc Coating

1. Product Overview

Corrugated galvanized roofing sheet is used in industrial and civil buildings where roof and wall panels need low self-weight, practical corrosion resistance, and stable profile geometry. The hot dip galvanized coating protects the steel surface from atmospheric exposure, while the corrugated profile increases stiffness compared with flat sheet.

For this specification, full hard grades such as SGCH or G550 are commonly selected when the project requires better profile retention after roll forming. This is especially relevant for steel structure roofing, long roof runs, wall cladding, and lightweight enclosure systems.

2. Technical Solution

Product performance is based on:

• Hot dip galvanized coating for barrier protection and sacrificial protection
• Full hard substrate for better profile shape retention
• 76 mm wave width and 17–17.5 mm wave height for drainage and rigidity
• Multiple effective widths for different roof coverage layouts
• Cut-to-length production for project-based installation

In roofing systems, zinc coating affects corrosion resistance, thickness affects stiffness and wind resistance, and hardness affects the ability of the sheet to keep its corrugated shape during handling and installation.

3. Specifications

4. Application

• Industrial building roofing
• Warehouse and workshop wall cladding
• Steel structure offices and logistics centers
• Airport terminals and station enclosure systems
• Stadium, theater, and large-span building panels
• General construction roof and wall systems

5. Processing

• Hot dip galvanized base sheet preparation
• Corrugation roll forming
• Cut-to-length production
• Roof and wall overlap installation
• Fastener fixing on purlins or support members
• Site trimming according to layout requirements

6. Advantages

• Full hard SGCH or G550 improves corrugated profile stability
• 40–275 g/m² coating range supports different service environments
• Multiple effective widths help optimize coverage and overlap layout
• 76 mm wave profile provides practical drainage and panel stiffness
• Suitable for both roofing and wall cladding systems
• Seaworthy packing supports export transport and project delivery

7. How to Choose

• For long-span or high-rigidity roof systems, full hard SGCH or G550 is usually preferred.
• For more exposed outdoor conditions, higher coating levels such as Z180–Z275 are commonly selected.
• For fixed building modules, effective width should be confirmed before production.
• For project installation, sheet length should match roof slope, overlap design, and transport limits.
• For wall cladding with lower rigidity demand, normal hardness may also be considered if project design allows.

8. FAQ

Q1: Why is G550 commonly used for corrugated roofing sheets?
Because higher hardness helps the sheet keep its corrugated shape after forming and improves rigidity in roof and wall applications.

Q2: What is the difference between original width and effective width?
Original width is the flat sheet width before forming, while effective width is the actual installed cover width after corrugation and side overlap.

Q3: Is 40 g/m² coating enough for outdoor roofing?
It depends on environment and service life target. For stronger outdoor corrosion resistance, higher coating levels are usually preferred.

Q4: Can the sheet be supplied in customized lengths?
Yes, corrugated galvanized roofing sheets are commonly cut to project-based lengths within the stated range.

Q5: Is this product only for roofing?
No. It is also widely used for wall cladding and enclosure systems in industrial and civil buildings.