Floating plywood floor on rigid foam insulation on concrete?
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.