Our Commercial Services Single-Ply System Single-ply roofs typically consist of a single layer of synthetic rubber (EPDM) or a thermoplastic membrane (PVC or TPO). Learn more Repair Re-roof Commercial Metal Roof Commercial metal roofing systems are typically made from galvanized steel panels coated with zinc. Aluminum and stainless steel are also popular materials in commercial metal roof manufacturing. Learn more Torch Down System Granulated asphalt is applied in the roofing roll factory. Normally, a mod-bit system consists of a minimum of two membrane layers a base sheet and a top sheet. Learn more