Method for producing a stable floor element, wherein the stable floor element has at least two mutually spaced longitudinal beams (120a, 120b, 120c) arranged in a plane, each of which has a concrete core (122a, 122b, 122c) and rubber coverings (124a, 124b, 124c) at least partially covering the concrete core (122a, 122b, 122c), wherein adjacent longitudinal beams (120a, 120b, 120c) of the stable floor element are each separated from one another by a longitudinal gap (130a, 130b), wherein the method comprises the following steps: (a) providing a casting mould, wherein the casting mould has upwardly open casting chambers (22a, 22b, 22c) and predetermines the shape of the at least two mutually spaced longitudinal beams (120a, 120b, 120c) of the stable floor element; (b) filling the open casting chambers (22a, 22b, 22c) with concrete up to a predetermined filling level in order to form the concrete cores (122a, 122b, 122c) of the at least two longitudinal beams (120a, 120b, 120c); (c) placing rubber coverings (124a, 124b, 124c) on the surface of the respective concrete cores (122a, 122b, 122c), wherein each rubber covering (124a, 124b, 124c) has at least one opening (125a, 125b, 125c) into which the concrete of the underlying concrete cores (122a, 122b, 122c) can penetrate; (d) pressing the rubber coverings (124a, 124b, 124c) placed on the surface into the respective concrete cores (122a, 122b, 122c) until a desired overall height of the stable floor element is achieved, wherein the concrete volume of the underlying concrete cores (122a, 122b, 122c)) that is displaced by the pressing process penetrates into the respective openings (125a, 125b, 125c) and fills them; (e) removing excess concrete emerging from the surfaces of the openings (125a, 125b, 125c); and (f) smoothing the concrete on the surface of the openings (125a, 125b, 125c) such that a stable floor element having a uniform surface is produced. (a) providing a casting mould, wherein the casting mould has upwardly open casting chambers (22a, 22b, 22c) and predetermines the shape of the at least two mutually spaced longitudinal beams (120a, 120b, 120c) of the stable floor element; (b) filling the open casting chambers (22a, 22b, 22c) with concrete up to a predetermined filling level in order to form the concrete cores (122a, 122b, 122c) of the at least two longitudinal beams (120a, 120b, 120c); (c) placing rubber coverings (124a, 124b, 124c) on the surface of the respective concrete cores (122a, 122b, 122c), wherein each rubber covering (124a, 124b, 124c) has at least one opening (125a, 125b, 125c) into which the concrete of the underlying concrete cores (122a, 122b, 122c) can penetrate; (d) pressing the rubber coverings (124a, 124b, 124c) placed on the surface into the respective concrete cores (122a, 122b, 122c) until a desired overall height of the stable floor element is achieved, wherein the concrete volume of the underlying concrete cores (122a, 122b, 122c)) that is displaced by the pressing process penetrates into the respective openings (125a, 125b, 125c) and fills them; (e) removing excess concrete emerging from the surfaces of the openings (125a, 125b, 125c); and (f) smoothing the concrete on the surface of the openings (125a, 125b, 125c) such that a stable floor element having a uniform surface is produced.