Abstract: An improved deck form supporting system for supporting sectional floor forms between bridge girders, for example concrete girders on top of which floor forms cementitious material is poured to form a concrete floor. The novel supporting system is located below the sectional floor forms and includes a series of evenly spaced wedges, usually triangular in shape, placed along the lower inclined or slanted surfaces of the suppoting girders (FIG. 4) along with a series of "L" shaped brackets which mate with the horizontal and vertical surfaces of said wedges (FIG. 5), the brackets having vertical and horizontal tubular extensions having jackscrew sections therein, the combination being used to support on "U" shaped shoring brackets (FIG. 3) horizontally, laterally disposed forming members placed between the bridge girders (FIG. 2) to support the floor forms.