I?m considering a few different options in designing my oven. Attached is a sketch of one of the basic ideas. Please note that the foundation is notional and I will be using the basic FB base design with angle iron etc., but plan on only having the hearth slab rest on 4? of the 8? wide CMU. Will this provide enough support? Another question is can I stack the 4?wide CMU on top of the 8?wide CMU and reinforce it with rebar all the way up? That gap between the outer oven wall and the CMU will be filled with perlcrete. Will that provide enough buttressing support to counteract the outward force of the arch? Any help would be appreciated, as I have never laid a block in my life (which may be painfully obvious from the design).
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Barrel Vault Design