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Early design questions for igloo style oven

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  • Early design questions for igloo style oven

    I’m in the early design phase of a 42” “igloo” style oven and am looking for some tips on dome design. I’d like the finished exterior of the dome to be tile or thin stone adhered to the dome with thinset. I saw a great video on YouTube of a similar build and the builder installed tile over a 4” layer of vermiculite which was installed over a layer of insulating blanket. Is there any issue with the stability of vermiculite that is installed over a soft substrate (blanket)? Or is it preferable to have a physical break between the inner dome bricks and the finish layer to avoid thermal cycling from damaging the exterior? Regardless, what is the best dome “sandwich” for an igloo style oven?