How To Prepare Soil For A Concrete Patio?
I am planning to have a concrete patio poured at my new house. How can I be sure the contractor is properly preparing the “underlayment” before pouring the concrete? I know that a certain amount of dirt should be removed (about 8″), that 3/4″ gravel and fine gravel should add back about 4″ when compacted, and that there should be a pre-soil treatment as well as a vapor barrier installed before the rebar goes down, but what else should I be sure gets done before the 4″ thick concrete gets poured?
Also, what PSI rating should the concrete be for this type of application?
I am in the Southern California area, in case weather is a concern.
