cantilever 107Cantilevered objects, such as buildings, beams or concrete slabs feature direct support under one end, while the other end extends past the foundation wall into open space. A cantilevered concrete slab rests on the ground at one end and extends a few feet past the foundation wall on the other end. Cantilevered buildings and slabs give architects the ability to create intriguing building designs. Cantilevered designs also create unique stresses on the suspended slab, which must be carefully engineered.