JIS SGCC / SGCH / G550 Corrugated Galvanized Roofing Sheet with Z20–Z275 Coating

Product Specification

JIS SGCC / SGCH / G550 Corrugated Galvanized Roofing Sheet with Z20–Z275 Coating for Roof and Wall Applications

1. Product Overview

Corrugated galvanized roofing sheet is used in industrial buildings, warehouses, workshops, and civil structures where corrosion resistance, low self-weight, and convenient installation are required. The zinc coating protects the steel substrate from atmospheric exposure, while the corrugated profile improves panel stiffness compared with flat sheet.

This product range covers 0.14–1.5 mm thickness with effective widths from 650 mm to 1050 mm. It is suitable for roof and wall systems in large-span steel structures, lightweight buildings, and general enclosure projects.

2. Technical Solution

Product performance is based on:

• Hot dip galvanized coating with Z20–Z275 coating range
• Corrugated profile improving stiffness and drainage performance
• SGCC grade for general roofing sheet use
• SGCH or G550 option for higher hardness and better profile retention
• Cut-to-length production matched to project installation sizes

In roofing applications, coating mass affects corrosion resistance, while thickness and substrate hardness affect rigidity, handling, and installation stability. For projects requiring stronger shape retention after roll forming, SGCH or G550 is commonly selected.

3. Specifications

4. Application

• Industrial and civil building roofing
• Warehouse and workshop wall cladding
• Large-span steel structure housing
• Mobile house and light enclosure systems
• Interior and exterior building decoration
• General roof and wall sheet projects

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 supports
• Site trimming according to project layout

6. Advantages

• Z20–Z275 coating range supports different service environments
• Multiple effective widths help match different roof layouts
• Length options are suitable for common project installation sizes
• SGCH and G550 options improve profile rigidity for roofing use
• Corrugated profile improves stiffness without heavy sheet weight
• Suitable for both roof and wall cladding systems

7. How to Choose

• General roofing and wall cladding → SGCC is commonly used
• Higher rigidity requirement → SGCH or G550 is usually preferred
• More exposed outdoor conditions → higher zinc coating such as Z180–Z275 is commonly selected
• Project-based layout → confirm effective width and cut length before production
• Visible galvanized finish → select spangle type according to appearance preference

8. FAQ

Q1: What is the difference between SGCC and G550 corrugated sheet?
SGCC is commonly used for general galvanized roofing sheets, while G550 is selected when higher hardness and better profile retention are required.

Q2: Why is effective width smaller than the formed sheet width?
Because part of the sheet width is consumed by the corrugated profile and side overlap during installation.

Q3: Can the sheet be used for both roof and wall applications?
Yes. It is commonly used for roofing, wall cladding, and lightweight enclosure systems.

Q4: What zinc coating is suitable for outdoor use?
For more demanding outdoor environments, higher coating levels such as Z180–Z275 are commonly preferred.

Q5: How should project length be selected?
Length is usually determined by roof slope, overlap design, transport limits, and site installation conditions.