How Thick Do I Need to Pour a Concrete Patio?
In order for your concrete to provide the necessary support for foot traffic as well as to sustain heavier objects like stonework, trash cans, vehicles, etc, you should plan to pour at least 4 inches thick of concrete for common use like sidewalks or short retaining walls and at least 6 inches for vehicle use.
In addition to pouring a minimum of 4-6 inches of concrete, you should install rebar, short for reinforcing bar within the concrete.