Abstract: A roller door and frame combination is disclosed. The roller door has corrugations therein and the corrugations are maintained in the desired shape by flexible wearing strips at each side of the door and fastened to crests on one face of the door. The frame has channel members at each side in which the door slides. The channel members have a resilient friction surface therein which is arranged to engage with the face of the door which does not have the wearing strips fastened thereto and the friction surface is of such size as to restrain the door against lateral back and forth movement in the frame and provide controlled resistance to sliding of the door should the door thickness change.