JM EPDM Peel & Stick T-Joint Patches are round shaped, uncured EPDM (ethylene propylene diene monomer) sheets with a factory laminated, self-adhering EPDM/butyl tape. It is formulated to provide high initial strength in both peel and shear at typical rooftop temperatures along with improving the speed and quality of field seaming on JM EPDM roofing systems.