How Thick Should A Concrete Patio Be
How Thick Should A Concrete Patio Be. If they don't, then 4 thick is usually standard for a patio slab, how large or small it is doesn't really matter. Building codes across the country usually require a thickness of 3.5 inches and compressive strength of 3,000 psi.

The minimum thickness of any kind of concrete slab is 4 inches. You can concrete garage foundations directly on your soil if you have sandy soil that drains well, but if you have clay or something similar, you will need at least 15 cm to 20 cm of gravel for the base. The concrete slab should be level, a little more than a half inch thick.




