how much more heat loss in normal brick vs fire brick iam only going to use the oven to cook maybe 4 pizzas at a time the oven is a 36 inch with a 3 1/2 vermiculite under were the floor will be and around the dome will be a 1 to 2 inches vermiculite the a 4 inch brick wall and 2 to 3 inches of vermiculte on top of the dome so do i realy need to spend the extra monney on fire brick
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brick or fire brick