EPDM is a lightweight and flexible synthetic rubber used for low slope It is made up of a single-ply membrane that is highly resistant to wind, hail, UV radiation, thermal shock, and extreme temperatures. An EPDM rubber roof can be installed by being adhered, mechanically fastened, or ballasted. The type of installation that is best for your project depends on several factors. A fully adhered system simply means the roof is glued or “adhered” to the surface beneath it. Adhering takes the most time to install but is also the longest-lasting of the EPDM systems.