Three-dimensional componental module at "T" modified for the industrial preformation of buildings

A building enclosing room spaces comprising a multiplicity of molded precast concrete building modules defining the upright walls and the horizontal overhead ceilings of the room spaces, each of said building modules including an elongate vertical slab and an elongate horizontal slab, the vertical and horizontal slabs being cast integrally in one piece and being rigid with respect to each other, the horizontal slabs having first and second longitudinal side edges, the vertical slab of each module having an upper portion upon which the horizontal slab is supported, and the vertical slab being disposed between the first and second edges of the horizontal slab and significantly closer to the first edge of the horizontal slab than to the second edge thereof whereby to define first and second horizontal flanges respectively extending in opposite directions transversely away from the vertical slab, the second flange being significantly wider than the first flange, the vertical slabs extending vertically throughout the full height of the walls and having a height which many times exceeds the thickness of the vertical slab, the horizontal slab having a width which many times exceeds the thickness thereof, a first one of the building modules having a vertical slab with an end portion extending endwise away from the adjacent terminal end of the horizontal slab, said end portion of the vertical slab having an upper edge which underlies and supports the horizontal slab of a second one of the building modules.