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stick with perlcrete (perlite & portland cement), vermicrete (vermiculite & portland cement), or the best option - ridgid refractory board insulation (commonly refered to as FB board - sold in the FB store as well as other brands at your local kiln or refractory supplier).
USE NOTHING ELSE - you won't be happy with performance and will need a hardwood forest if you want to use it regularly.