More concrete...

Methods vary by low temps and types of soil. Also the load expected to go on it. In the country we have no codes, we just do it with common sense.\
Back in SW Mo. I had a concrete pad in a barn with no gravel for a base, no wire or bar, no fiberglass. 4-5 inches thick at most....it got a 1 ton dodge dually on it ever so often and never a crack or problem! But all that was done by me, a redneck. Go figure.