The Advantage-Lok Standing Seam panel gives you the leak resistance and beauty of a traditional standing seam roof without the expense and installation difficulty of clips. The fastening slots allow the panel to easily expand and contract with temperature changes. The full rib provides for additional leak protection and wind uplift resistance, and a sharp, well-defined look. The Advantage-Lok Standing Seam panel is designed to be installed over a solid deck. With proper handling and installation, your Advantage-Lok panels will provide years of leak-free performance and beauty.