EPDM is a synthetic rubber that has been used extensively for decades in the roofing industry. Its durability under harsh, exposed roofing conditions renders it an ideal choice for use in more controlled applications, such as Thru-Wall Flashing. EPRA-MAX™ EPDM Thru-Wall Flashing remains flexible to -49° F and is not susceptible to decomposition due to UV exposure, making it an excellent product for year-round installation.