Metal Sales Manufacturing Corp.’s Retro-Master roof replacement solution provides structural framing, sub-framing and metal roof panels. The 100 percent steel retrofit roof system can be installed over any existing sloped or flat roof whether metal, asphalt, built-up or membrane. Insulation can be added to the roof system and a variety of cool-roof-compliant colors are available. The system also accommodates photovoltaic integration and rainwater catchment.