Galvalume Corrugated Roofing Sheet - GL Roof Panel
Galvalume corrugated roofing sheet with AZ50-AZ185 (55% Al-Zn) coating — provides 2-4× longer service life than standard galvanized corrugated. Superior atmospheric corrosion resistance plus excellent solar heat reflectivity reducing building cooling costs. Premium metallic-finish roofing for marine, tropical, industrial and other demanding outdoor environments.
| Product | Metal Roofing Sheet |
| Profile | Corrugated (wave), pitch 76mm, depth 18-25mm |
| Substrate | Galvalume (GL) AZ50-AZ185 |
| Thickness | 0.25 – 0.60 mm |
| Effective Width | 750 – 1050 mm (profile dependent) |
| Length | 1000 – 12000 mm (custom) |
| Standard | AS 1397, ASTM A653/A792, EN 10346, JIS G3302/3321 |
| Coating | Z40-Z275 / AZ50-AZ185 / PE/SMP/HDP/PVDF paint |
GL Aluzinc Coated — 2-4× Longer Life Than GI — Premium Metallic Roofing
What Is Galvalume Corrugated Roofing Sheet?
Galvalume corrugated roofing sheet uses 55% aluminum-zinc (GL) coated steel substrate instead of standard galvanized (GI), providing 2-4× longer service life in equivalent outdoor conditions. The Al-Zn alloy coating offers superior atmospheric corrosion resistance plus excellent heat reflectivity.
GL corrugated sheets are particularly effective in marine, tropical, industrial and other aggressive environments where standard galvanized roofing requires more frequent replacement. The bright metallic surface also reflects solar radiation, reducing building cooling costs in hot climates.
For projects requiring maximum metallic-finish roofing life without the cost of paint coating, Galvalume corrugated is the proven premium choice recommended by metal building system engineers worldwide.
Technical Specifications
Available in various thicknesses, widths and coating options. Common standards include ASTM, JIS, EN and GB/T. Different industries may choose different specifications depending on service life, corrosion requirements and fabrication method.
| Product | Metal Roofing Sheet |
|---|---|
| Profile | Corrugated (wave), pitch 76mm, depth 18-25mm |
| Substrate | Galvalume (GL) AZ50-AZ185 |
| Thickness | 0.25 – 0.60 mm |
| Effective Width | 750 – 1050 mm (profile dependent) |
| Length | 1000 – 12000 mm (custom) |
| Standard | AS 1397, ASTM A653/A792, EN 10346, JIS G3302/3321 |
| Coating | Z40-Z275 / AZ50-AZ185 / PE/SMP/HDP/PVDF paint |
Contact our technical team for specific grade and coating recommendations based on your application environment and processing requirements.
Applications
Thanks to its corrosion resistance, processing flexibility and cost-performance ratio, this product is widely used across construction, manufacturing and industrial sectors.
🏠 Residential Roofing
Villas, townhouses, rural houses. Color-matched roofing sheets with 15-25+ year life. Lightweight, easy installation.
🏗️ Commercial Building
Warehouses, factories, shopping centers, airports. Large-span roofing with excellent drainage and wind resistance.
🏭 Industrial Facility
Steel structure workshops, PEB buildings, cold storage, logistics parks. Cost-effective metal cladding solutions.
🌾 Agricultural
Poultry houses, barns, grain silos, greenhouses. Corrosion-resistant roofing for high-humidity environments.
Corrugated vs Trapezoidal Roofing
The two most common metal roofing profiles. Choice depends on span requirements, aesthetics and application.
Corrugated (Wave) Profile
The classic, proven roofing profile with excellent drainage and universal acceptance.
Trapezoidal (IBR/T) Profile
Modern industrial standard with superior spanning capability and clean architectural lines.
| Comparison Item | Corrugated (Wave) Profile | Trapezoidal (IBR/T) Profile |
|---|---|---|
| Profile | Sinusoidal wave pattern | IBR / trapezoidal ribs |
| Visual | Traditional, classic look | Modern, clean lines |
| Spanning | Shorter spans | Longer spanning capability |
| Strength | Standard structural performance | Higher section modulus per unit width |
| Drainage | Excellent water flow | Good drainage with flat pans |
| Installation | Simple, well-known technique | May require specific fastening |
| Cost | Generally lower | Slightly higher for equivalent thickness |
| Best For | Residential, agricultural, light commercial | Industrial, commercial, long-span |
Main Advantages
This product combines durability, processing flexibility and cost-effectiveness for a wide range of applications.
- Multiple substrate options — GI, GL, PPGI, PPGL — matched to performance requirement and budget
- Custom profiles and lengths — Corrugated, trapezoidal, tile, standing seam and custom profiles up to 12m length
- Factory roll-formed — Precision roll-formed from certified coil stock — consistent profile dimensions and quality
- Color and finish options — Metallic (GI/GL), RAL colors (PPGI/PPGL), wrinkle/textured, wood-grain print
- Wind and weather tested — Profiles designed and tested for wind uplift, rain penetration and thermal movement resistance
- Export packaging — Bundle-packed with plastic interleaving, steel strapping and container-optimized loading
Why Choose SunSea Steel?
Choosing the right supplier means more than buying steel. It also means stable quality, export experience, efficient communication and reliable delivery support.
Stable Product Quality
Uniform coating mass, reliable base steel quality and stable surface condition help ensure consistent performance in export orders.
Custom Specification Support
Thickness, width, coating mass, steel grade, surface treatment and packing can be customized according to project requirements.
Professional Export Service
Support for packing, loading, shipping documents and delivery coordination helps customers manage international orders more efficiently.
Fast Response and Quotation
Buyers can quickly get specification confirmation, technical support and quotation feedback for distribution, project procurement and manufacturing use.
Factory Strength and Production Capability
Our production system focuses on coating uniformity, thickness control, clean surface quality and export-standard packing. From raw material selection to final inspection and shipment preparation, every stage is managed to improve product consistency and reduce customer risk.
For buyers, factory capability means more than output volume. It also means communication efficiency, documentation support, shipment coordination and the ability to provide stable product supply over time.
- Stable production planning for export orders
- Support for customized sizes and coating requirements
- Professional handling of packing and shipment preparation
- Inspection and tolerance control before delivery
Quality Control and Inspection
Product quality is one of the key concerns for overseas buyers. Quality should be controlled not only by final visual inspection, but also by process stability, specification verification and export packing inspection.
Surface and Dimension Inspection
Surface condition, width, edge quality and dimensional tolerance are checked before delivery.
Pre-Shipment Quality Control
Packing condition, identification, quantity confirmation and shipment readiness are reviewed before export.
Thickness and Width Verification
Thickness tolerance, width and coil dimensions are checked to ensure the material is suitable for roll forming, profiling and project processing needs.
Coating and Surface Checking
Coating weight requirements and surface appearance are reviewed before packing and shipment.
Packing Inspection
Export packing is examined to ensure moisture-proof protection, steel straps and edge protectors are correctly applied.
Shipment Preparation
Quantity, identification, loading readiness and related documentation are confirmed before export delivery.
Standard Export Seaworthy Packaging
For steel export, correct packaging is extremely important. Even high-quality product can suffer surface damage, moisture exposure or edge deformation if packing is not suitable for sea shipment.
- Inner Moisture Protection: Waterproof kraft paper and plastic film help reduce moisture contact.
- Outer Steel Cover: Additional outer steel sheet gives stronger protection during handling.
- Edge Protection: Edge protectors reduce impact damage during lifting and stacking.
- Steel Strapping: Radial and circumferential straps help keep the coil stable.
- Pallet Support: Wooden or steel pallets can be used according to shipping requirements.
Shipping, Loading and Delivery Solutions
Shipping method depends on order quantity, coil size and destination requirements. Container shipment and break bulk vessel are the most common methods for steel coil export.
Container Shipment
Suitable for regular export orders. Coils packed on pallets and loaded into containers for safe sea transport. FOB/CIF/CFR available.
Break Bulk Vessel Shipment
For large volume orders or oversized coils. Professional lifting, lashing and port handling for bulk steel procurement.
Small to medium orders: container shipment is preferred. Large-scale or project orders: break bulk vessel may be more efficient.
Frequently Asked Questions
What is the standard roofing sheet length?
Standard: 1000-6000mm. Custom up to 12000mm. Most projects use 2000-4000mm to minimize end laps and leak risk.
What thickness for roofing?
Residential: 0.35-0.50mm. Commercial: 0.40-0.60mm. Industrial: 0.50-0.80mm. Thicker = stronger wind uplift resistance.
What substrate is best for roofing?
GL (Galvalume AZ150) is the industry standard — 2-4× longer than GI. PPGL for color + max corrosion resistance. Full-hard GI for economy.
Corrugated vs Trapezoidal — which is better?
Corrugated (wave) is traditional, cost-effective, good drainage. Trapezoidal (IBR/T-profile) has better spanning capability, stronger, more modern.
What is the MOQ for roofing sheets?
5,000 linear meters or 25 MT per profile/color. Mixed containers with 25 MT total minimum.
Can roofing sheets be customized?
Yes. Profile, length, color, substrate, thickness, and packing can all be customized to project requirements.
Looking for Quality Metal Roofing Sheets?
Contact us for roofing sheet pricing, custom profiles, substrate options and export solutions. Factory direct worldwide.
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