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IMO, if you are going to cut it out and pour, another couple of inches isn't going to make much difference in the cost. I go at least 6" just for laughs. 8" is over kill but it is better. You just have to dig a bigger hole and deal with the dirt. It will take you about four days(maybe five) doing it by yourself. Is it worth your time? Many people talk about hardness, and depth and all the engineering stuff for a simple lift (Home use?). Just pour 6" of pad and be done with it. it will hold up just fine for a long, long time.
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