don't need any piers or thicker concrete... just dont put it too close to exspantion joints or cuts
Depends what you want to lift. If your only ever gona lift a 4-5k# car, you can probably get away with standard thickness. If you want to put in a heavy duty lift and think you may have the need to lift a 12k# truck/tractor/skid loader etc, you need thicker concrete. It would be a lot less hassle now to go 12" thick under the lift, than repairing the concrete later!
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