A building structure connecting means comprising at least one first building element and at least one second building element , the connection means for connecting an end portion of the at least one first building element having a thickness (T5), to an end portion of the at least one second building element , wherein: - the first building element is a slab element forming part of a floor, and the second element is a wall element forming part of a wall; the connection means further comprising: - a first joint element connected to and forming part of the end portion of the first building element ; the first joint element having a length substantially corresponding to the thickness (T5) of the first building element ; - a second joint element connected to and forming part of the end portion of the second building element ; - at least one elongate member for slidable engagement with at least one of the first joint element and the second joint element , such that relative movement between the first joint element and the second joint element in at least one direction is prevented, characterised in that - the first building element and the second building element being made from EPS-concrete wherein an aggregate of the concrete consists of particulate expanded polystyrene; and in that - each of the first building element and the second building element include at least two spaced-apart lattice girders , each lattice girder extending at least in a two-dimensional extent between the end portions of the building elements , the at least two spaced-apart lattice girders being connected at an upper portion and at a lower portion (140") to an upper mesh reinforcement and a lower mesh reinforcement , respectively, and wherein the first and second joint elements are fixed, by means of welds, to the lattice girder forming part of the reinforcement (R) of the first and second building elements , respectively, so that tension and compression forces in the first building element and the second building element are carried substantially by the reinforcement (R) and transferred via the welds to the first joint element and the second joint element . - the first building element is a slab element forming part of a floor, and the second element is a wall element forming part of a wall; the connection means further - a first joint element connected to and forming part of the end portion of the first building element ; the first joint element having a length substantially corresponding to the thickness (T5) of the first building element ; - a second joint element connected to and forming part of the end portion of the second building element ; - at least one elongate member for slidable engagement with at least one of the first joint element and the second joint element , such that relative movement between the first joint element and the second joint element in at least one direction is prevented, - the first building element and the second building element being made from EPS-concrete wherein an aggregate of the concrete consists of particulate expanded polystyrene; and in that - each of the first building element and the second building element include at least two spaced-apart lattice girders , each lattice girder extending at least in a two-dimensional extent between the end portions of the building elements , the at least two spaced-apart lattice girders being connected at an upper portion and at a lower portion (140") to an upper mesh reinforcement and a lower mesh reinforcement , respectively, and wherein the first and second joint elements are fixed, by means of welds, to the lattice girder forming part of the reinforcement (R) of the first and second building elements , respectively, so that tension and compression forces in the first building element and the second building element are carried substantially by the reinforcement (R) and transferred via the welds to the first joint element and the second joint element . <EOS>