I am building a vault style oven with standard firebirck. As the cladding on the outside is supposed to support the arch design of the oven, why would you use portland cement which cracks and looses it's strength when subject to temp. Would it not make sense to clad the outside with a couple inches of perlcrete to reduce the temp level to the portland cladding. This would seem to allow for some expansion/contraction of the oven without cracking the concrete cladding as well. You could add a few more inches of insulation outside the concrete to serve to retain heat. Any thoughts.
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Vault style firebrick oven cladding