Pre-Kleened EPDM is a 45-mil-thick, non-reinforced flexible flashing membrane made of ethylene-propylene-diene monomer rubber. Pre-Kleened EPDM is provided in various widths and has talc washed from surfaces during production to facilitate field handling and installation. Pre-Kleened EPDM is primarily used as a through-wall flashing in masonry wall and cavity wall construction. The product is also used in challenging air/vapor barrier transition details, such as curtain wall and wall-roof connections. Pre-Kleened EPDM is well-suited for through-wall flashing and sub-assembly tie-ins because it can be built into an assembly, with the installer leaving a durable, loose flap for tie-in to another assembly as construction progresses.