RHEINZINK America Inc., Cambridge, Mass., offers Quick Step, a modern, prefabricated roofing system. The installer can assemble the individual components quickly and with very little effort. In addition, prefabricated flashings are available for roof penetrations, including chimneys and skylights. The system's profile gives architects the opportunity to bring a new aesthetic to metal roofing. The company also offers interlocking tiles that can be installed on most curved surfaces without difficulty. The flat-lock tiles have a distinctive rectangular look and are generally laid perpendicular to the roof slope. They can be used with square and diamond tile on areas such as dormers, chimneys and roof edges.