Heat-sound insulating wall

A heat-sound insulating wall which is light and not intended to be used as a load-bearing wall but to be attached to a rigid support structure such as a frame of a building, said insulating wall comprising an acoustic box structure which comprises a substantially U-sectioned sheet which has a mid-portion which defines a first side of the box structure and is slightly ribbed and opposed flange portions which are spaced apart and extend from one side of the mid-portion, and a flat sheet which extends across the whole of the U-sectioned sheet and is wholly spaced from said mid-portion and fixed to the flange portions and defines a second side of the box structure, the flange portions extending beyond said flat sheet relative to said mid-portion and thereby forming rib structures on said second side of the box structure, a thin panel of sound insulating high-density mineral wool which extends across the whole of the box structure from one flange portion to the other opposed flange portion and is disposed in the space between said mid-portion and said flat sheet, a pad of flexible porous material affording a heat insulation and having a weight substantially similar to the heat insulation and weight of an insulating mineral wool felt structure, said pad adjoining the whole of said second side of the box structure and said rib structures and having a thickness which exceeds the thickness of said panel and exceeds the dimension of said rib structures measured from said flat sheet and laterally overlapping the rib structures and an outer panel which bears against and protects said pad and has ribs or corrugations which extend in a direction perpendicular to the ribs of said mid-portion.