Abstract: A poured concrete slab foundation which has a first component comprising a poured concrete slab on soil, having at least one interior grade beam, grade beams about the periphery of said poured concrete slab, and an array of openings along and adjacent to each said interior grade beam; a second component comprising an array of driven piles in the soil below said interior and periphery grade beams; and a third component comprising poured concrete closures in said openings, which is made by preparing a poured concrete slab on soil, having at least one interior grade beam, grade beams about the periphery of said poured concrete slab, and an array of openings along and adjacent to each said interior grade beam; driving an array of pilings in the soil below said interior grade beams adjacent to the openings and the periphery grade beams and pouring concrete closures in said openings.