Want to turn that bare corner in the yard into a small patio? Or redo a patio that is cracked and settling? Well, concrete is a great variable to work with.
DEMOLITION (if applicable):
If you have an existing concrete structure, it is imperative to break up the concrete and remove it. Never pour concrete over existing concrete.
In the installations of a new 4-inch thick slab, excavate the slab area about 7 inches deeper than the desired finished height. Now backfill the area with 3 inches of gravel or other suitable sub base. Use a plate compactor to compact the area. This gravel will create a solid foundation for the concrete to be installed over.