Abstract: The present invention concerns a shuttering (100) for the formation of a wall or similar, comprising a first wall formwork device (10) of an insulating material and a second wall formwork device (20), which are formed to be arranged in parallel so that a space (x) is formed between them intended to be filled with flowing concrete. A number of form ties (30) are arranged to connect the first and second wall formwork devices (10,20). The first wall formwork device (10) comprises a number of building or plastic foam blocks (11), and the second wall formwork device (20) comprises a number of sheathings (21).