Most baking stones are just too thin. Many have a high temp warning around 500 degrees, and they almost all advise against giving it any sort of thermal shock - aka getting the stone good and hot, and then putting something cold on it, like bread dough, or a pizza.
For pizza, a steel works WAY better. For bread, I don't like it, by the time the bread is done the bottom is burnt AF as the kids say.
The Big Green Egg stone has a great reputation - it's twice as thick as most stones, and is made for going in blasting hot grills - those grills can hit temps over 900*F easily. They're available in several sizes. I've got one, used it a lot, zero complaints other than it was pricey, I want to say I paid about $50 for it. Also, being so thick, it's heavy.
I bet that Kiln shelf Nick posted works
great too, at a fraction the cost of the Big Green Egg pieces.
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