By suitable, we mean a base that's solid ... Below, we'll walk you through the two variations of concrete slab shed foundations, and explain what circumstances each is suitable for.

will determine whether a slab or below-grade foundation is the right option. Poured and block foundations both sit on concrete footings, or poured pads that serve as a base for the walls.

Finally, don’t base decisions about concrete mixes by their strength alone — high strength concrete slabs usually shrink more if the higher strength is obtained by increasing the cement content.