This modular formwork system works with minimal nailing to form bridge decks, box culverts, parking ramps, elevated slabs, and more. Adjustable height joist hangers support sections of 2x joists from beams, girders, walls, or pillars, using edge forms for haunches. Borg plywood support plates and side hangers form shored grid systems with rectangles up to 48 in. square with engineered plywood deflection. Borg Adjustable Joist Hanger Co. Inc. 952-938-3705.