Anodized Aluminum Plate: What Is It Really, and Why Is It Used for Roofing?

We often receive inquiries from customers about anodized aluminum plate for roofing. They typically ask about the right thickness and width, which colors last well, and how to ensure they're getting true anodized material. These questions actually highlight the key points when choosing anodized aluminum. Below, we’ll explain what it is, how it's used, and what to look for.

What is anodized aluminum plate?
Anodized aluminum plate, also called anodic oxide aluminum plate, is made by forming a layer of aluminum oxide on the surface through an electrolytic process. This oxide layer is converted from the aluminum itself, so it's very durable and doesn't peel off easily. Its key features are a natural metallic finish (common colors: silver, gold, bronze, black), corrosion and wear resistance, and a long service life.

How is it different from painted or coated aluminum?
This is where many people get confused. Painting or coating adds an external layer to the aluminum surface, which may fade or peel over time. True anodizing transforms the aluminum surface into an oxide layer, so the color is stable and won't peel. Many customers specifically ask for “true anodized, not painted” because it lasts longer, making it better for outdoor uses like roofing that face sun and rain year-round.

What are the common specifications?
Taking roofing as an example, common thicknesses range around 0.9–1.0 mm, which provides good strength without being too heavy. Widths are usually between 1000–1250 mm, balancing installation convenience and material efficiency. For alloys, 3003 or 5005 are popular choices—they offer good strength and corrosion resistance for outdoor construction. The anodized layer should ideally be at least 20 microns (µm) thick for better weather resistance. Colors like gold and bronze are widely preferred for their steady, timeless metallic look.

Where is it mainly used?
Roofing is a common application because anodized aluminum plate is lightweight, durable, and looks premium. Besides roofing, it's also used in building facades, interior decor, signage, lamp housings, and industrial products that require high surface hardness and corrosion resistance.                                                                                                                                                                                                                                                                                                                                                   

What should you check when purchasing?

1. Check anodizing quality: Work with a reliable supplier. You may ask for basic information like anodized layer thickness to ensure the product meets your requirements.             

2. Understand material standards: For general industrial or architectural use, you can refer to common international or industry standards to gauge suitability.

3. Discuss packaging and lead time: The anodized surface needs protection, so it's good to clarify packaging and production timelines in advance.

4. Consider sampling: If color or finish is critical for your project, requesting a sample can help with visual and physical confirmation.

While anodized aluminum plate may have a higher upfront cost than coated alternatives, its long lifespan and low maintenance make it more economical over time. If you're considering it for roofing or other outdoor projects, clarifying your needs regarding environment and desired outcome will help streamline communication with suppliers.

Our company specializes in manufacturing anodized aluminum plate, offering a variety of thicknesses, colors, and specifications to meet different project needs. If you have specific requirements, feel free to reach out to us for more product information and technical support.