Abstract: Process for the production of aerated-concrete or foamed-concrete moldings with envelope densities ?450, where a cement- and sulfate-carrier-free lime formulation is produced, made of a CaO component made of a lime or lime hydrate and of an SiO2 component, and of a blowing agent or foam, the constituents of the formulation are mixed with water to give a pourable composition, the composition is charged to a casting mold which has a base and side walls and end walls, and which has an inner space in the shape of a parallelepiped, the composition is allowed to undergo incipient hardening in the casting mold to give a concrete cake, and the casting mold is tipped through an angle of 90° onto one of its side walls, and the cake is removed from the shell, the cake is cut in a sawing unit to give moldings, a hardening base is placed on one of the long sides of the cut cake, and the hardening base together with cake and casting-mold side wall is tipped through an angle of 90° onto its long side, the side wall of the c