Abstract: An access flooring system includes a plurality of adjustable height pedestals which support a skeletal grid of stringers. The stringers, in turn, support a plurality of rectangular floor panels. Each pedestal includes a head for supporting not only stringers which are registered with perpendicular edges of floor panels, but, in addition, stringers which extend diagonally. The diagonal stringers provide increased load capacity for the system and resist medial deflections of the panels.