Why won’t a steel frame rust?
• Steel frames are made of steel protected against corrosion by a hot-dipped metallic coating of a zinc-aluminum alloy. These coatings conform to the appropriate national standards or their equivalent. In external applications such as roofing these products are exposed to the elements and have excellent durability, so in less exposed applications such as inside the building envelope they weather more slowly. Where there are cut edges the galvanic action, or sacrificial protection, of the coatings protects the exposed steel edge against corrosion.
