For some reason reading that I am thinking 12" at a minimum. Can you tell me the weight of the hammer itself? I'm sure someone here will know for sure. Can depend on the soil compaction in your area as well.
Btw, this is for the area immediately under the hammer only. The entire shop does not need to be that. Just make sure of where you really want it. pour it under and 6" to the outside and then put in a break yourself. should really cut down on the vibration to the shop.
Last edited by Candidquality; 10-04-2007 at 03:22 PM.
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