Installed with an expansion clip, the 1 ½” Field-Lok™ panel is a non-structural single-locked or double-locked roof panel. The FLM series is mechanically seamed in the field and provides the traditional appearance of standing seam. Plank ribs are standard. The FLM series may also be curved with or without plank ribs. The minimum radius is 12′-0″. Contact ATAS for radius limitations. Click here for info. on curved 1 ½” Field-Lok™ panels.