Hi folks, I'm Steve and I just finished the block stand for my 42" pompei style oven. I'm about to start framing up for the slab pour and was wondering how hot the underside gets. I've not yet decided which to use under the floor, either perlcrete or foamglas. I was thinking about adding a layer of rigid polystyrene insulation under the concrete. I figured I could lay that on the form with lag bolts pushed up through the bottom and then the concrete poured directly onto the foam. I'm just not sure how much heat it can take. Any thoughts?
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Under the Hearthslab Insulation