The footingThe footing is the concrete base of the foundation that’s poured into the foundation trench. This base supports the foundation and is usually poured as an integral part of a slab. If the footing becomes exposed to regular moisture, the foundation could sag and cracks could appear. More is the concrete base of the foundation that’s poured into the foundation trench. This base supports the foundation and is usually poured as an integral part of a slabA layer of plain or reinforced concrete. Usually of uniform thickness but sometimes of variable thickness, and supported by beams, columns, walls, other framework, or on the ground. More. If the footingThe footing is the concrete base of the foundation that’s poured into the foundation trench. This base supports the foundation and is usually poured as an integral part of a slab. If the footing becomes exposed to regular moisture, the foundation could sag and cracks could appear. More becomes exposed to regular moisture, the foundation could sag and cracks could appear.