Abstract: There is disclosed a panel construction which is useful for overhead doors where the door is supported at side bearing points and is supported, when open, in an overhead, horizontal position. The door is formed of a core having a honeycomb structure which is defined by a plurality of parallel strips of sheet material, each formed into a sinuous path and bonded to immediately adjacent strips at its outwardly bowed extremities, the assembly of strips of sheet material thereby providing a honeycomb or reticulated core structure. The core is aligned in the door with the strips of material extending across the width of the door. The door is provided with covering sheets which extend over the opposite sides of the honeycomb core. The covering sheets are bonded securely to the edges of the strips of sheet material of the honeycomb core by adhesive material which, preferably, has some resiliency.