A system and method for supporting and positioning stay in place metal decking between support girders which have a substantially horizontal top surface with opposite side edges defining a width of the substantially horizontal top surface, includes a plurality of straps for placement on the substantially horizontal top surface of the support girder and having substantially vertical end portions at the ends thereof substantially aligned with the opposite edges of the substantially horizontal top surface, and a pair of angle irons, one side of each angle iron forming the height of the angle iron adapted to be adjustably attached to and to be adjustably vertically positioned with respect to the vertical end portions of the strap, and the width of the angle iron being sufficient for holding the edge of a metal decking pan. Wind clips can be installed to hold the assembly in position in high wind conditions.