Reply To: Workshop foundation/base
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The frost line is the maximum depth the ground will freeze in a particular area or region and there may not be one where you are if the ground never freezes Rowly. Check with your local building codes officials and they can tell you. And yes, 4″ is a normal thickness for a concrete pad. Sven-Olof gave some good advice for steel reinforcing wire that I would agree with. It helps prevent cracking. If you make the perimeter of the slab thicker, say 12″ or so deep and about 12″ wide that forms an integral footer. You can anchor your walls directly to a slab made like that and be certain it will support the weight of the structure but you have to make wood forms for the perimeter. That’s no big deal to do. You can lay concrete blocks (CMU’s) on a conventional footer if you like and let them be the form for the slab. Lots of ways to do it. Good luck!