Abstract: A door includes at each of its corner junctions between its rail and stile a dowel rod located in a hole extending through the stile and into the rail. The dowel rod is mounted at an angle of approximately 10.degree. from horizontal, with the dowels at the top junctions or joints being oriented inwardly downwardly, and with the dowels at the bottom joints being located inwardly upwardly.A center panel is carried within the rectangular frame defined by the stiles and rails, and is mounted therein by four splines, each located in corresponding grooves along the edge of the center panel and along the interior of the stiles and rails. The splines are not glued or affixed to the center panel or to the stiles or rails, and are arranged at their corners to overlap by virtue of a split lap joint, thereby making the seam between the center panel and the rails and stiles essentially airtight.