Abstract: A flat wall panel at least substantially made of cellulose material, a special feature being the fact that the wall panel is at least substantially made of layers of paper/cardboard, each layer at least substantially being made up of a corrugated sublayer and a flat sublayer provided on one side thereof, which layers of paper/cardboard are interconnected via an adhesive applied to the corrugations of the corrugated sublayers, wherein the wall panel is impregnated, in particular with a resinous material, and wherein at least one strengthening layer which is stiffer (i.e. less deformable) than the layers of paper/cardboard is provided, which strengthening layer is connected to a layer of paper/cardboard on one side of the wall panel via an adhesive.

Abstract: A flat wall panel at least substantially made of cellulose material, a special feature being the fact that the wall panel is at least substantially made of layers of paper/cardboard, each layer at least substantially being made up of a corrugated sublayer and a flat sublayer provided on one side thereof, which layers of paper/cardboard are interconnected via an adhesive applied to the corrugations of the corrugated sublayers, wherein the wall panel is impregnated, in particular with a resinous material, and wherein at least one strengthening layer having a greater elasticity modulus than the layers of paper/cardboard is provided, which strengthening layer is connected to a layer of paper/cardboard on one side of the wall panel via an adhesive.

Abstract: A wall element, comprising two outer layers extending at least substantially parallel to each other, between which two or more intermediate layers are provided, characterized in that said intermediate layers extends between the outer layers in a zigzag fashion, wherein the intermediate layers are arranged in a nested fashion.

Abstract: A wall element at least substantially made of cellulose material, comprising two outer layers extending at least substantially parallel to each other, between which an intermediate layer is provided, characterized in that said intermediate layer extends between the outer layers in a zigzag fashion, wherein the parts of the intermediate layer that extend from one outer layer to the other are at least substantially flat.