Interlock® Metal Roofing Systems Interlock® Metal Roofing Systems With an Interlock Metal Roofing System you're protected with a lifetime of value. All of our metal roofing systems our total commitment to protect and beautify your home for life, and to safeguard the environment. Interlock® Slate The graceful elegance of slate roofing without the weight. Interlock® Cedar Shingles Crafted to resemble thin-cut cedar shingles. Built to last for a lifetime… Interlock® Shake The natural beauty of cedar shake roofing. Lifetime performance. Interlock® Mediterranean Tile Inspired by luxurious look of traditional Mediterranean tile, without the heavy weight. Interlock® Standing Seam Suitable for a variety of slopes and design applications. Hidden fastener system. Interlock® Solid Copper Interlock offers Slate and Cedar Shingle in 12 oz or 16 oz, Shake or Standing Seam in 16 oz and Tile in 20 oz copper.