Abstract: The core of the wall construction is formed by the four layers, fibreboard (1) with inside surface coating (5) of cement, acoustic barrier layer (2) made of flexible, fibrous material, particle insulation layer (3) made of loosely blasted-in wood particles and outer covering layer (4). By this specially developed construction, a non-load-bearing external wall of a building is achieved, which has an excellent heat and sound insulation, a great heat-retention capacity of the inner layer and a fire resistance value of at least F30 despite the light construction method. The wall construction can be provided on the inside with an additional layer (6) which enhances the heat conduction and increases the conduction of heat given off by a heating device (7) into the heat-retaining fibreboard (1).