hello all I am new to this but have been reading a lot of your post and there is a great deal of info and some great stories. My name is Jerry and I am building a 42" Pompeii oven. I have the base completed and am now in the process of laying out the dome. My question is I read about FB Board in place of pouring the thick structual slab then the insulating slab, so I inquired about the FB Board and the sales person asked what I was using it for. I replied its for a pizza oven, she then had concern about the FB board giving off toxic fumes when hot. I was shocked so I tryed to look into it but came up short. Does anyone have an answer for this. Also I keep hereing how expensive it is to purchase this board but where I come from it is 12 dollars and change canadian funds. I hope this is the same ( 24" wide x 36" long x2" thick ceramic FB board. Thanks
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FB board issue