Steelmama Introduces Its Three Layer Profile Machine: A Single Production Line for A Variety of Metal Roofing Profiles Steelmama introduces its three layer profile machine: a single production line for a variety of metal roofing profilesIn the competitive world of metal roofing production, efficiency and versatility determine profitability. The TR4 & TR5 & 850 Tile Roofing Sheet Three Layer Machine is engineered to