Abstract: A element based wall construction, process of modular construction and apparatus for constructing structures of spaced concrete cylinders and beams and foam insulating blocks. The wall construction includes spaced, vertical concrete cylinders interconnected by horizontal concrete beams, reinforced by centrally located reinforcing bars, with a pilaster projecting inwardly beyond the cylinders and beams to support roof and floor joists or trusses, and insulating foam blocks occupying the spaces between cylinders and beams and projecting outwardly beyond the cylinders and beams to define channels for mounting plumbing and electrical conduits and wiring beneath the sheet rock or siding which abuts the foam block surfaces.