Building construction system using mortar-less modular building block elements

Claim 1

A modular system of building construction comprising full blocks, half blocks, adaptor blocks, wall end blocks, corner blocks and wall junction blocks, each consisting of an interlocking block element comprising a main body portion vertically offset a predetermined substantially constant amount relative to a pair of opposed side slab portions integrally formed with said main body portion, said side slab portions being substantially mutually parallel and of equal dimensions, said main body portions being horizontally offset at least at one lateral end thereof relative to said side slab portions, whereby a plurality of said block elements are horizontally and vertically interlocked by overlapping stepped joints in surface to surface engagement when laid end to end in superimposed courses, each of said stepped joints being defined relative to a block element by at least a pair of edge surfaces disposed substantially one at right angle to the other, said main body portion of each block element being hollow and provided with at least one recess extending vertically from upper face to lower face of said main body portion and open to at least one lateral end of said body portion, said recess continuously extending horizontally and vertically behind said overlapping stepped joints and being adapted to receive mortar or cement poured within said wall structure for uniting each of said block elements with each other by allowing said concrete or cement to flow vertically and horizontally within said wall structure only and to set to a solid from whereby set mortar or cement is present within said wall structure behind each horizontal and vertical overlapping stepped joint forming an uninterrupted moisture, heat and wind barrier and said overlapping stepped joints forming a dam preventing seepage of mortar or cement through said joints to the exterior of said wall structure.