The Butlerib® II Roof System is the industry’s most trusted through-fastened roof, combining strength, economy, and ease of installation. With deep 1½-inch corrugations, factory punching, and Butler’s exclusive return leg sidelap, Butlerib® II panels deliver superior durability and long-term weathertightness. Butlerib® II Roof Panels – Genuine panels engineered for a precise fit on Butler buildings. Each panel is factory-formed for accurate alignment and coated with the Butler-Cote™ premium fluoropolymer finish, resisting chalking, fading, and corrosion for decades of performance. Replacement Roof Panels – Order authentic Butlerib® II panels to restore or extend your building’s protection. Designed specifically for Butler systems, replacement panels ensure seamless integration and preserve the structural integrity of your roof.