Abstract: A reusable low maintenance forming system for forming concrete floors, ceilings and walls with joists thereunder utilizes concrete displacement form pans supported by a temporary framework and floor. A plurality of alignment channels are arranged in parallel series of elongate aligned rows and are adapted to alignably receive and support the flanges of parallel and adjacent form pans. A plurality of joist bottomed wedges are arranged in parallel series of aligned rows and adapted to fit within the alignment channels as to abut and seal against the lower free ends of the form pans afterwhich uncured concrete may be placed over the system.