Single Ply Roofing Single-Ply Systems, Inc. Single-Ply Systems, Inc. is a national commercial roofing contractor specializing in white thermoplastic roofing systems. Having... applied over 75 million square feet since 1983, Single-Ply Systems, Inc. is among the largest roofing contractors in the world installing white envirometally friendly roofing systems... cooler in the summer, reducing cooling costs. Eliminate tear off waste and cost by recovering your existing roof with sustainable white thermoplastic roofing systems. It...