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I have a granite slab as a landing at the front of my WFO. My slab measures 63 long and 22 wide (approx measurements) and almost an 1nch thick. So far I have had no problems. However, I did my best to select a slab that had a uniform crystal size and that had no decernable cracks or faults. I think that success in this has alot to do with the individual slab selected. As for temperature and expansion I have had my slab so hot directly in front of the opening where radiant heat is high, that one could not touch the slab for even a short moment without wishing you had not. And at the same time quite cool to the touch at the extremes of each end.
I decided to simply anchor my slab very loosely using simply a thin layer of sand and fireclay so that it would be free to expand and contract as needed. It does make for a nice work surface upon which to place freshly baked bread and hot pizzas. Also if you select a polished surface one can see what is happening at the dome top by looking at the reflection. Here's a post with some photos that show the slab: http://www.fornobravo.com/forum/3/st...html#post41508