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Insulating a barrel oven

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  • Insulating a barrel oven

    Hello Folks
    This is my first post/question
    I believe I'm in the right section though I'm not sure if I follow correct protocol - so, sorry in advance : )
    Do direct me to correct forum if necessary.

    I build a barrel style oven to which I'm committed on account of space parameters that preclude dome style (which I prefer).
    The barrel will be wrapped in ceramic blanket and then a cement-based casing.
    The barrel will be housed in a brick box.

    What is best insulation material between the barrel and the interior walls of the brick box?
    I consider perlite only.
    But the ease makes me think that I'm missing something.

    By the way, the brick housing will be topped with a concrete roof.
    I suppose I must be sure to seal it properly should water/humidity make its way into the housing and generate deterioration within.

    Thank you kindly for your answers.