According to QUIKRETE's online calculator, the amount of concrete needed for a 10- by 10-foot slab depends on the thickness of the slab. For a 4-inch slab, either eight 60-pound or six 80-pound bags are required, while for a 6-inch slab, either 12 60-pound or nine 80-pound bags are necessary.
Before laying a concrete slab, the local building department should be contacted to determine whether any restrictions exist or if a permit is needed for construction. When it's time to build, preparing the site by leveling it and creating strong and level forms for the project ensure that the slab is correctly laid.
