Abstract: A sectional door panel for use in an overhead door assembly is provided. The sectional door panel includes a front panel, a rear panel, an insulating material between the front and rear panels, an upper edge integral to the front panel, a raised tongue formed in the upper edge, an upper rail integral to the upper edge, a lower edge integral to the front panel, a concave groove formed in the lower edge, and a lower rail integral to the lower edge. An overhead door assembly is also provided that utilizes a plurality of the sectional door panels.