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Hi Ian,
I originally planned to lay a 100mm concrete slab (2.5m x 2.5m).
However, after clearing/leveling an area of back lawn for a slab and casting a concrete pier (approx 1m deep and 30mm diam with 1/2" stainless threaded rods inserted), I changed my mind.
I elected to place the floor (frame of treated hardwood joists covered by yellow-tongue board) directly on the dirt.
Perfectly stable, and easy to shift when we eventually shift house in a few years.
Good luck with your project.
Cheers,
Jeff
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