Bennelson
For my home here in Canada the perimeter of the slab inside the foundation is exactly like what you have in the illustration. We didn't bevel the top edge of the foam. The floor tile is covering the 2" of foam. So the thermal break is on the inside. I'm not sure if warming the block foundation would be in your best interest. With my experience here I would go with the inside perimeter foam thermal break.
I can hardly wait to hear your findings of floor heat in your man cave once you have it operational.
One final word of caution. DO NOT OPERATE WITHOUT AN ANTI-FREEZE in your system. One burp be it a power-outage or pump failure or a battery going flat in your thermostat your tubes will freeze and split. Rendering all your work useless and near impossible to repair.
Propylene Glycol is your friend. NON toxic and it will save your butt if something goes south in the depths of winter.
Randen
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