This isn't a DIY job. It might also be necessary to install a gutter or a rain diverter with EPDM since it's common for water to pool and settle on a flat or low-slope roof. Another thing to note ...

Most flat roofs aren't actually flat; they slope slightly to one side (a 1/4 ... Other materials, like EPDM rubber, TPO (a type of plastic) and PVC (another plastic), need to be heat-sealed.

The structure is made of wood and the shed-type roofs ... systems, EPDM is less sensitive to weather conditions during installation. The membrane was fully adhered to the sloped wooden structure ...