Metal Panel Substrates and Coatings

With Galvanized substrates, the greater the amount of zinc the greater the protection against panel corrosion. Two commonly used Galvanized substrates are designated as G100 and G60. These designations relate to the total amount of zinc contained on both sides of the panel surfaces. G100 contains 1.0 ounce of zinc for every one square foot of panel while G60 substrates contain 0.6 ounces of zinc. The important fact to consider is that a G100 substrate contains 66% more protective zinc than a G60 substrate. This difference will have a direct correlation to panel longevity and long-term aesthetics of your project.

For most applications, Galvalume substrates offer the best long-term solution, and Galvalume's superior performance has been proven in the field. Over four decades of testing and field applications has shown that Galvalume delivers superior corrosion resistance compared to Galvanized panels. In fact, Galvalume's performance in the construction industry has been so superior, that steel mills warranty the substrate against perforation due to corrosion. Similar warranties do not exist for Galvanized.