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      5 Features to Consider when Buying GI Sheets

      March 28, 2025 | Linton Incorporated

      5 Features to Consider when Buying GI Sheets

      What features should you consider when buying GI sheets?

      1. Thickness and gauge
      2. Level of zinc coating
      3. Sheet size and dimensions
      4. Tensile strength
      5. Finish and coating type

      Overview

      • Selecting GI sheets with the right thickness, zinc coating, size, and tensile strength ensures durability, efficiency, and cost-effectiveness.
      • A high zinc coating level is essential for rust prevention, especially in outdoor and industrial applications.
      • Proper sheet dimensions and tensile strength improve structural integrity and installation efficiency.
      • Linton Incorporated offers premium GI sheets that meet industry standards, providing dependable solutions for various construction needs.

      Choosing the right galvanized iron (GI) sheets is crucial for ensuring durability, cost-efficiency, and structural integrity in construction projects. Whether for roofing, walling, or cladding, selecting the best materials requires careful evaluation of key features like thickness, coating, corrosion resistance, and load-bearing capacity.

      In this article, we’ll explore the essential features to consider when buying GI sheets to help you make an informed decision. With Linton Incorporated as your trusted supplier, you can ensure top-quality materials for long-lasting performance.

      Thickness and Gauge

      Gauge refers to the standardized measurement of sheet thickness. The lower the gauge number, the thicker and stronger the sheet. Thicker GI sheets also provide better resistance to external forces, making them ideal for heavy-duty applications like structural components and roofing that require high load-bearing capacity.

      Selecting the appropriate thickness depends on the intended use of the GI sheet. For instance, roofing and siding applications often require mid-range thickness to balance strength and cost-efficiency, while industrial or heavy-duty projects may demand thicker sheets for enhanced durability. Thinner sheets, on the other hand, are more lightweight and flexible, making them suitable for applications that require easy shaping and installation.

      Level of Zinc Coating

      Level of zinc coating

      The zinc coating on GI sheets serves as a protective layer that prevents rust and corrosion, ensuring long-lasting performance even in harsh environments. This coating is applied through a galvanization process, which enhances the sheet’s resistance to moisture, chemicals, and other corrosive elements.

      The higher the level of zinc coating, the better the sheet’s ability to withstand exposure to rain, humidity, and pollutants—making it an essential feature for outdoor and structural applications.

      For general construction and roofing applications, a coating of at least 275 GSM is recommended to ensure optimal protection against corrosion. However, industrial projects or structures exposed to extreme weather conditions may require higher coating levels for extended durability.

      Sheet Size and Dimensions

      GI sheets are available in various lengths, widths, and thicknesses, allowing them to be used for roofing, cladding, structural support, and more. Choosing the correct size helps minimize material waste, ensures proper installation, and enhances the overall efficiency of your project.

      The standard sheets come in widths of three to four feet and lengths ranging from six to 12 feet, though custom sizes are also available for specific requirements. The right dimensions will also depend on the application. Roofing projects, for instance, require sheets that provide adequate coverage with minimal seams to reduce the risk of leaks.

      Meanwhile, structural applications may demand custom-cut sheets for precise fitting and load distribution.

      Tensile Strength

      Tensile strength

      Tensile strength refers to the ability of GI sheets to withstand tension and resist breaking under stress. This is a critical factor in determining the durability and structural integrity of the material, especially for applications that require high load-bearing capacity.

      A higher tensile strength is particularly important in construction, where GI sheets are used for roofing, wall cladding, and structural support. The stronger the sheets, the better they can withstand environmental factors like heavy winds, impact from debris, and varying temperatures—making them ideal for both residential and industrial applications.

      Finish and Coating Type

      A protective coating is applied to prevent rust and degradation, ensuring the sheets’ longevity even in harsh environments. That’s why choosing the right finish is essential, especially for applications exposed to moisture, chemicals, or extreme weather conditions.

      Various types of coatings and finishes provide varying levels of protection and aesthetic appeal. Some options include:

      • Regular spangle finish: This features a crystallized zinc pattern, providing a distinctive look while offering standard corrosion resistance.
      • Minimized spangle finish: A smoother surface with refined zinc crystallization, often used in applications requiring uniform appearance.
      • Galvanized coating: It provides a robust layer of protection against rust, commonly used for roofing, wall cladding, and industrial structures.
      • Polyester or color-coated finish: It adds an extra layer of durability and enhances the sheet’s appearance. It is ideal for architectural and decorative applications.
      • Aluzinc coating: It is a blend of aluminum and zinc that offers superior corrosion resistance, especially in coastal and high-humidity environments.

      Key Takeaway

      Understanding the key features to consider when buying GI sheets is essential for selecting the right materials that offer durability, strength, and long-term value. By carefully evaluating these features, you can ensure that your project benefits from high-quality, cost-effective, and long-lasting materials.

      At Linton Incorporated, we have all your GI sheet needs covered. As a leading supplier of galvanized iron sheets in the Philippines, we provide high-quality, industry-standard sheets that deliver strength, durability, and cost-efficiency for your projects. Contact us today and let us supply the GI sheets you need to build with confidence!