I am ready to pour the insulating slab , that my hearth slab will sit on.My question is, what material is used for the hearth slab, that will absorb and stand up to the heat of the oven . I want the slab 6" thick and then lay the fire brick on top of that to make the hearth 10" thick. what should this 6" hearth slab be made of ?
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hearth material ?