Abstract: A load bearing wall element is provided with recesses or projections at the upper ends of the side edges, for interlocking or engaging projections or recesses respectively of adjacent wall elements. The wall elements may be provided with cantilevers extending at the tops of the side edges, the cantilevers either having recesses at their upper or lower edges in order to enable interlocking with recesses of adjoining elements. The wall elements may be fabricated from reinforced concrete and may preferably have a hard foam layer affixed thereto or incorporated therein.

Abstract: This modular building wall unit comprises a hard foam layer and a concrete layer intimately bonded to each other along an interface between the layers. A reinforcing wire mesh matt is embedded in the hard foam layer and reaches with anchoring elements into the concrete layer which may also have embedded therein a further wire mesh matt. The present units are cast in a mold by first keeping the mold horizontally and filling it partially with the hard foam. When the hard foam is sufficiently cured, the mold is brought into a substantially upright position, closed and filled with the concrete mix. Of course, a top portion is left open for the filling.