rear end 18 the supporting structure 12 includes two supporting members 20 in the form of corrugated sheets 22 affixed to each covering member 14 each corrugated sheet 22 extends from a front end 24 beyond the front end 16 of the covering member 14 to a bend 26 adjacent the rear end 18 each corrugated sheet 22 is bent at approximately 90 u00b0 at the bend 26 and extends from the bend 22 to a rear end 28 the rear end 28 is displaced internally of the wall panel 10 in the embodiment of the drawings each corrugated sheet 22 has 11 5 wave peaks or corrugations these are arranged with two wave peaks extending beyond the front end 16 of the corresponding covering member 14 and comprising a first side portion 30 of the supporting member 20 8 wave peaks lying adjacent the covering member 14 and 1 5 peaks forming a transverse portion 32 extending inwardly of the rear end 18 of the covering member 14 each corrugated sheet 22 is fixed to a corresponding covering member 14 by suitable means such as adhesive along the first six peaks closest to the front edge 16 of the covering member 14 the two peaks adjacent the covering member 14 which are closest to the rear edge 18 comprise a second side portion 34 of the supporting member 20 these peaks 34 are not fixed to the covering member 14 a receiving area 36 is thus defined between the second side portion 34 and the covering member 14 the wall panel 10 further includes a plurality of bracing members 38 the bracing members 38.