Re: Expanding Foam as Insulation
After looking at the pictures now, I think your idea of using polystyrene sheets (or something similar) would be better, as long as your not planning on putting anything really heavy on the floor it shouldn't be too springy if you use a decent grade particle board (MDF) on top.
Picture No2 shows the air gap under your shed, this IMO should be left alone and not boxed in and filled with expanding foam or whatever.
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