Grell Roofing completed the installation of a new 50-mil Duro-Last PVC Roofing System on a commercial building in downtown Dubuque, Iowa. This energy-efficient commercial roofing system provides superior waterproof protection, durability, and long-term performance. Our team specializes in commercial roof replacements , flat roofing systems, leak repairs, preventative maintenance, and new commercial roofing installations throughout Iowa and the Midwest.