I'm building a new hearth for my Vermont castings Intrepid 2. I have 1 inch thick 1 foot square quartz stones to put over 1/2 inch durock over 3/4 plywood. For the back I have Eldorado Stone cultured stone, (a concrete veneer) over 1/2 inch durock and 1/2 sheetrock. Anyone know if this is adequate protection for the walls and floor? The floor is hardwood and the pad will be removable.