The installation process and method is dependant on the type of commercial roofing you opt for. Southern MD Roofing offers: Built-up Roofing Membrane (BUR) – Bitumen material is layered on the bottom of the roof and applied either hot or cold and acts as the adhesive; ply sheets are added on top; surfacing materials made up of small stones/gravel are applied last Metal – installed over a solid insulating layer of materials Thermoset Roof Membrane (EPDM) and Thermoplastic Roof Membrane- single ply roofing that is unrolled and secured with adhesives or fasteners Green Roofs – a base of sealant is installed on the roof followed by roofing tiles that have root repellant materials, a drainage system, a light layer of soil/bedding, and then plants