Abstract: An upwardly-acting sectional door composed of a plurality of sections for sliding from a vertical track which aligns the sections in a vertical plane around a curved track to a horizontal track which aligns the sections in a horizontal plane. The sections are hinged together and each section is substantially the same throughout its width or length so that it may be cut off to provide any width door. The sections comprise an extruded or formed foamlike light material of a good heat insulating property which is reinforced at the location that the hinges are placed, and each section has interfitting edges. The sections are finished by face pieces of stiff material that may be adhesively secured to the foam or made integral therewith.