This roof panel is designed with 5 raised rib corrugations for strength and to allow water to drain off the roof. Roof panels are welded to the top rail and to each other. It is absolutely essential that your cargo container roof panels remain intact, solid, and unbent. If any of your panels become weakened due to rust holes, steelwork patches, or impact holes, then you are running a huge risk of irreparable damage to your warehouse products, construction equipment, and other valuable items. The amazing durability of cold rolled corrugated roof panels make them a top choice for withstanding the harshest of weather conditions, like wind, hail, and more. Although shipping containers have a long life span, they still require occasional upkeep and repairs.