Basement subfloor

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Osb Floor, Basement Subfloor, Interior Wall Insulation, Basement Insulation, Rigid Foam Insulation, Rigid Insulation, Plywood Floor, Floor Insulation, Wooden Floorboards

I am proposing a project for a slab on grade Habitat house with 2" of foam under the slab and 1 1/2" or 2" of foam on top of the slab with 3/4" t&g plywood or osb floor. I want to float the plywood rather than use screeds to minimize thermal bridges. The interior walls are all non-bearing so they can be fastened to the plywood. I am certain that this is not an original idea so I would like to know if anyone has tried this and what the down side issues might be.

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