Subgrades and Subbases for Slabs
"We use 6 to 8 inches of crusher run," says Steve Lloyd, Lloyd Concrete Services, Forest, Va. "It includes lots of fines and we compact it to 98%. We will not use #57 stone, that's like trying to place a slab on marbles. ... Clay (cohesive soils) can best be compacted using a vibrating sheepsfoot roller or a rammer (also called a ...