Name: Color Coated Roofing Sheets (PPGI/PPGL)
Brand: Ruixiang Steel
SKU: RX-ROOFING-001
Price: 750.00 USD
Availability: InStock
Rating: 4.8 (124 reviews)

Published by Ruixiang Steel Group Editorial Team | Updated: April 2026

Executive Summary (Key Takeaways)

Material Base: Use PPGI for standard industrial sites; PPGL (Aluzinc) is superior for high-salinity coastal areas.
Premium Coatings: PE offers great value; PVDF provides 25+ years of resistance against UV and chemical erosion.
Customizable Profiles: Available in Corrugated, Trapezoidal (T-tile), and Glazed Tile designs.
Standard Compliance: Fully compliant with ASTM A755 and JIS G3312 standards.

Roofing is the first line of defense for any building. Color coated roofing sheets, often referred to as prepainted galvanized steel (PPGI) or prepainted galvalume (PPGL), have revolutionized modern architecture by combining the structural strength of steel with advanced anti-corrosive multi-layer coatings.

At Ruixiang Steel Group, we utilize advanced coil coating technology to ensure our roofing products withstand the harshest tropical and industrial environments while maintaining vibrant colors for decades.
Industrial factory roof featuring Ruixiang color coated roofing sheets

1. Understanding the Layered Technology of PPGI Roofing

A high-quality roofing sheet is not merely "painted steel." It is a sophisticated multi-layered system designed for longevity:

Base Metal: Zinc-coated (Galvanized) or Al-Zn coated (Galvalume) steel core.
Chemical Pre-treatment: Enhances adhesion between the metal substrate and the paint.
Primer Coating: The primary barrier against rust and under-film corrosion.
Top Finish Coat: Determines the color, gloss, and resistance to UV radiation.
Back Paint: Protects the underside of the sheet from condensation and internal humidity.

2. Selecting the Right Coating for Your Climate

Environmental conditions dictate which coating will perform best. Ruixiang offers four specialized options:

PE (Polyester)

Cost-effective; 10-15 years lifespan. Best for general urban/industrial use.

SMP / HDP

High durability; enhanced UV resistance. Ideal for high-heat tropical regions.

PVDF

The premium standard. 25+ years life. Essential for coastal and high-pollution areas.

3. Technical Specifications

Feature	Technical Range
Thickness	0.12mm – 1.2mm
Zinc Coating	Z30 – Z275 g/m² (or AZ30 – AZ150)
Tensile Strength	G300, G550 (Full Hard)
RAL Colors	RAL 3020, 5015, 6005, 9002, etc.

Different corrugated and trapezoidal profiles for roofing

Frequently Asked Questions (FAQ)

Q: How do I prevent rust at the cut edges of the roofing sheets?

A: We recommend using cold galvanizing spray or professional edge-sealing paint immediately after cutting to protect the exposed steel core from moisture.

Q: Which profile is best for high-rainfall areas?

A: Trapezoidal (T-tile) profiles generally offer better water drainage capacity compared to traditional corrugated waves for low-slope industrial roofs.