This type of formwork can be made in the form of hollow blocks with dimensions of 95x25x25 cm. The shape of each of them is peculiar, and therefore it can be collected according to the puzzle method. And in the working process, a reinforcing cage is put into it and tied with wire. After assembling 4 rows, the solution is poured into the blocks, and as the structure is erected, this process is repeated the right number of times. As a result, they get a wall insulated on both sides with foam, the thickness of which is up to 25 cm.