Abstract: Before being brought and fastened to the location of the building and before being connected to one another skeleton supports and ceiling beams of individual cell elements are orientated and preferably held together on a framework jig. For the skeleton supports and/or for the ceiling beams an orientation device, such as an opening accommodating the respective sleleton part, a peg penetrating the support or the like is foreseen.A formwork jig with a railing which extends preferably over the entire inside space of the cell element serves to facilitate assembly of the ceiling beams. At least one supporting device is foreseen in the middle of the jig for the connection point of ceiling beams.