Patent ID: 8663413

Claim:
A method of making a roofing membrane comprising: providing an ethylene propylene diene monomer rubber (EPDM) material sheet, the EPDM material being uncured and having a thickness of between about 50 mils and 70 mils; extruding a thermoplastic polyolefin (TPO) material sheet onto the EPDM material sheet, the extruded TPO sheet having a temperature of at least 160 degrees Celsius and a thickness of between about 15 mils and 35 mils; and pressing the EPDM material sheet and TPO material sheet together via one or more rollers; wherein the heat of the TPO material sheet causes at least a top portion of the EPDM material sheet to cure such that crosslinking of the TPO and EPDM material sheets occurs at an interface of the sheets so as to bond the sheets together.