Abstract: A hollow building-block-type module for a wall construction that utilizes a plurality of such modules laid up with mortared joints in staggered courses and with horizontal and vertical reinforcing bars embedded in concrete poured into the spaces or voids within the hollow blocks. The module comprises parallel side walls joined by vertical webs to define an integral void between adjacent webs of the module and voids between adjacent webs of abutting modules. The voids in each course are vertically aligned in stacks with voids of other courses and the webs are provided with notches for locating the horizontal reinforcing bars away from an adjacent side wall. The module also has lips projecting inwardly from the side walls defining an integral void so that a vertical rod inserted in a stack of voids between a side wall and the horizontal reinforcing bars is also spaced away from the interior surface of the respective side walls of the vertically aligned voids.

Abstract: A three-cavity, horizontal-beam-forming building block, or distribution block, with two-fold rotational symmetry about a vertical center line, has the opposite ends of each longitudinal sidewall complementarily tongued and grooved, and four like transverse webs extending above the sidewall top coplanar margins in end-beveled projections; a web face spacing (of 1:4:2:4:1) defining a slot-like narrow middle cavity, adjacent thereto, equal larger bottom-closed cavities as cells of twice slot size, and end recesses of half-slot size; and like horizontal-reinforcing-bar-locating, paired bar notches in each web top to a depth below the sidewall top margins enabling horizontal bar embedment by mortar filled to the sidewall tops.