an energy efficient garage door construction comprising a plurality of interconnected door sections . each of the sections includes a pair of symmetrical metal panels forming the opposed sides and long edges of the section , an expanded polystyrene core to which the metal panels are adhesively bonded , and a pair of generally u - shaped end pieces nestingly received between the metal panels . the metal panels form oppositely facing recesses along one side edge and tongues along the other side edge so that adjacent panels interfit to create a baffle effect , and the panels are held together by c - shaped retaining plates which serve the secondary function of hinge reinforcement members .