Missed your point on the styrofoam! I didn't know there was EPS that was able to take the load of an entire floor on top, that's certainly a great idea. In the end, you'll obviously want to have as much R below and as little as possible above the loops, and foam directly under the loops should be pretty awesome.
Are you planning on putting hardwood floor on top of it? What sort of underlayment were you thinking of?
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