Regular Spangle Corrugated Galvanized Roofing Sheet SGCC / G550 with JIS G3302 Standard for Industrial and Civil Buildings

1. Product Overview

Regular spangle corrugated galvanized roofing sheet is widely used in industrial buildings, warehouses, workshops, and civil structures where lightweight installation, corrosion resistance, and practical service life are required. The corrugated profile improves sheet stiffness, while the zinc coating helps protect the steel substrate from moisture and atmospheric exposure.

For SGCC and G550 grades, the sheet can be selected according to forming method and final use. SGCC is commonly used for general corrugated sheet applications, while G550 full hard material is more suitable where higher profile rigidity and shape retention are needed.

2. Technical Solution

Product performance is based on:

• Hot dip galvanized coating for surface protection
• Corrugated profile increasing rigidity over flat sheet
• 76 mm wave width and 17–17.5 mm wave height for drainage and stiffness
• SGCC and G550 options for different forming and structural requirements
• Regular spangle surface for standard galvanized appearance

In roofing and wall systems, zinc coating level affects corrosion resistance, while sheet thickness and grade affect stiffness, fastener holding performance, and profile stability over the support span.

3. Specifications

4. Application

• Industrial building roofing
• Warehouse and workshop wall panels
• Civil building roof and wall cladding
• Steel structure housing panels
• Fence and enclosure sheets
• Interior and exterior decorative sheet use

5. Processing

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

6. Advantages

• Regular spangle gives a standard galvanized roofing appearance
• Corrugated profile improves stiffness and drainage performance
• Multiple effective widths support different roof layouts
• G550 option provides better profile retention for roofing use
• 40–275 g/m² coating range covers general to higher corrosion protection needs
• Suitable for both industrial and civil building projects

7. How to Choose

• General roofing sheets → SGCC is commonly selected
• Higher rigidity requirement → G550 full hard is usually preferred
• Outdoor exposure and longer service life → higher zinc coating such as Z180–Z275 is commonly selected
• Project with fixed roof module → confirm effective width before production
• Longer panel requirement → confirm cut length according to roof slope and overlap design

8. FAQ

Q1: What is the difference between SGCC and G550 corrugated roofing sheet?
SGCC is commonly used for general corrugated roofing applications, while G550 is a harder grade used where higher profile rigidity and shape retention are required.

Q2: Why is effective width different from the sheet width before forming?
Because part of the sheet width is consumed by the corrugated profile and side overlap during installation.

Q3: Is regular spangle suitable for roofing sheets?
Yes. Regular spangle is widely used for standard galvanized roofing and wall panels where a conventional metallic finish is acceptable.

Q4: Can the sheet length be customized?
Yes. Corrugated galvanized roofing sheets are commonly cut to project-based lengths within the processing range.

Q5: What zinc coating is commonly used for outdoor roof applications?
Higher coating levels such as Z180–Z275 are commonly selected when better outdoor corrosion resistance is required.