NON-SEQUENTIALLY INSTALLED DRY JOINT WALL PANEL SYSTEM

A wall panel system for attachment to a building surface includes a plurality of generally vertical supports, and a plurality of generally horizontal mounting rails interconnected with the vertical supports to define a panel mounting gridwork. The horizontal mounting rails have an upper mounting feature and a lower mounting feature, on a side opposite from the building surface. A plurality of panels each have a rear surface, an upper extrusion mounted to a top of the rear surface, and a lower extrusion mounted to a bottom of the rear surface. The upper extrusion mates with a corresponding lower mounting feature on the gridwork, and the lower extrusion mates with a corresponding upper mounting feature on the gridwork. The plurality of panels have a gap about a periphery thereof relative to any adjacent panels, whereby the panels can be non-sequentially mounted to the gridwork.