155SLAllSeam is a snap lock profile engineered for superior strength, weather resistance, and architectural refinement without mechanical seaming. Its 1-1/2" integrated seam features a bold 7/16” wide rib and an enhanced engagement system that combines concealed clips with a continuous interlock to deliver excellent seam integrity and watertight protection. Designed for demanding roof applications, the 155SLAllSeam Snap-Lok offers crisp, uniform lines and a smooth, concealed-fastener appearance proven structural performance and installation efficiency.