Designed for parapet walls to provide a clean, professional edge, counter flashing delivers waterproof protection for vertical terminations. DERBIGUM offers a variety of 1-piece and 2-piece versions to meet any project needs. DERBIGUM 1 Piece Counter Flashing is available in two versions: Surface Mounted and Reglet. This one-piece design is a great option when a receiver or joint reglet is not required.