Hi Mel,
Are you thinking of using granite as the cooking floor? I don't think that would work -- though granite makes a great oven landing, outside of the oven chamber. I have granite counters and a landing on my Healdsdburg ovens. The oven floor itself should be porous, and extract moisture from food, which is releases as steam. It should also hold heat.
Or, are you thinking of granite under a brick or refactory floor?
Let us know.
James |