Engineered Metal Roof Systems- Drexel Metals 1 1/2 traditionally mechanically seamed metal roof system is both applicable for light duty commercial and residential use. This profile is installed over a solid roof deck with min slope of 2:12. The architectural profile allows for radius applications. The concealed fasteners and floating clip system allows for thermal movement of panels and assists in minimizing the appearance of oil canning. This product is approved for use on projects requiring a Weather Tightness Warranty.