Company News

　　Roofing is the first line of defense for any building. For importers and construction contractors, choosing the right **corrugated steel roofing sheet** is a balance between aesthetics, durability, and cost.

　　At **Xinmaotai Steel**, we often get asked: *"Should I buy plain Galvanized sheets or spend more on Color Coated sheets?"* or *"What is the difference between Z40 and Z100 coating?"*

　　In this guide, we will break down the three most popular types of metal roofing sheets to help you maximize your project's value.

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　　1. The 3 Main Types of Corrugated Roofing Sheets

　　When browsing our **[Corrugated Roofing Sheet Category](https://www.xinmaotaisteel.com/index.php?c=category&id=12)**, you will primarily see three materials. Here is what they mean:

　　**A. Galvanized Corrugated Sheets (GI)**

　　* **What is it?** Steel coated with a layer of pure Zinc.

　　* **Appearance:** Silver, spangled (shiny patterns).

　　* **Best for:** Budget-friendly projects, warehouses, and temporary structures.

　　* **Pros:** Lowest cost; traditional look.

　　**B. Galvalume Corrugated Sheets (GL)**

　　* **What is it?** Steel coated with Aluminum (55%), Zinc (43.4%), and Silicon (1.6%).

　　* **Appearance:** Matte silver finish, smoother than GI.

　　* **Best for:** Areas with high heat or humidity.

　　* **Pros:** **Lasts 2-4 times longer** than standard galvanized sheets due to the aluminum barrier.

　　**C. Color Coated Corrugated Sheets (PPGI/PPGL)**

　　* **What is it?** Pre-painted steel. It uses GI or GL as a base and adds layers of paint.

　　* **Appearance:** Available in RAL colors (Blue RAL 5005 and Red RAL 3009 are most popular).

　　* **Best for:** Residential roofing, villas, and commercial buildings where aesthetics matter.

　　* **Pros:** Double protection (Zinc + Paint); beautiful appearance.

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　　 2. Key Quality Factors: Don't Be Fooled by Low Prices!

　　The price of corrugated roofing sheets varies widely in China. Why? It comes down to two hidden specs:

　　**1. Thickness Tolerance**

　　Some suppliers offer a very low price but supply sheets that are thinner than ordered (e.g., ordering 0.4mm but receiving 0.32mm).

　　* **Our Promise:** At Xinmaotai Steel, we strictly adhere to the agreed tolerance (usually +/- 0.02mm). What you order is what you get.

　　**2. Zinc Coating Weight**

　　The amount of Zinc (measured in g/m²) determines how fast the roof will rust.

　　* **Standard:** Z40g is common for low-cost markets.

　　* **Premium:** Z100g or higher is recommended for coastal areas to prevent corrosion from salt air.

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　　 3. Wave Designs and Profiles

　　We offer various corrugation profiles to suit different markets:

　　* **Raw Corrugated:** The classic wave pattern. High strength and excellent water runoff.

　　* **Trapezoidal (Box Profile):** More modern look, easier to install.

　　* **Glazed Tile:** Mimics the look of traditional ceramic tiles but with the strength of steel.

　　*(Note: Check our catalog to see the specific drawings for each width, such as 665mm, 800mm, or 900mm effective width.)*

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　　 4. Packaging and Shipping

　　Shipping metal sheets requires care. Improper packing leads to bent edges and moisture damage (white rust).

　　We use **seaworthy packing**:

　　1. Waterproof paper inner layer.

　　2. Galvanized steel outer sheet.

　　3. Steel strips for strapping.

　　4. Wooden pallet support (optional).

　　This ensures your goods arrive in your warehouse in perfect condition.

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　　Conclusion

　　* **On a budget?** Choose **Galvanized (GI)**.

　　* **Need long life?** Choose **Galvalume (GL)**.

　　* **Need style & durability?** Choose **Color Coated (PPGI)**.

　　**Ready to calculate your cost?**

　　Xinmaotai Steel is your reliable manufacturer in China. We export thousands of tons of corrugated sheets annually to Africa, South America, and Southeast Asia.

　　**[Click here to view our Roofing Sheet Products](https://www.xinmaotaisteel.com/index.php?c=category&id=12)** or contact us directly for a free quote on your required size and color.