Flat commercial roof siding refers to the materials and systems used to protect and seal the exterior of flat-roofed commercial buildings. This type of roofing often involves durable materials like TPO (Thermoplastic Olefin), EPDM (Ethylene Propylene Diene Monomer), or modified bitumen, which provide waterproofing, insulation, and protection against environmental factors. Flat roofing systems are popular for commercial spaces due to their cost-effectiveness, ease of installation, and maintenance.