Abstract: A reinforced garage door panel construction comprises a sandwich panel system having inner and outer skins with interconnecting insulating material, a continuous reinforcing strip extending along an inner face of the inner skin and secured to the inner face, a modified “Z” shaped structural member extending substantially the length of the panel and secured to the inner skin at the continuous reinforcing strip by fasteners which extend through the skin and into the continuous reinforcing strip, the modified “Z” shaped structural member having a web with an upstanding front flange and a depending rear flange, the depending rear flange having an inwardly extending lip extending essentially parallel to the web and the depending flange having spaced apart reinforcing beads extending the length of the depending flange.