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Insulating hearth - Use firebricks instead of vermicrete? - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Insulating hearth - Use firebricks instead of vermicrete?

    Hi everyone,

    My vermiculite/portland cement mix insulating hearth layer is thinner than I expected (2.5"). Instead of pouring another layer of the vermicrete, would an extra layer of firebricks work instead?

    My setup would be like:

    -2.5" vermiculite/portland cement
    -4" firebrick layer
    -4" firebrick layer (oven floor)

    Thanks in advance!
    Last edited by brennerwilliam; 09-19-2011, 04:30 PM. Reason: Typo

  • #2
    Re: Insulating hearth - Use firebricks instead of vermicrete?

    "would an extra layer of firebricks work instead?"

    It does not substitute for insulation. I would add another 1 1/2 or 2 inches of vermicrete. Having said that, if yours is a typical Pompeii oven, the 2 1/2 inches of insulation with the firebrick hearth on top should work OK.

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    • #3
      Re: Insulating hearth - Use firebricks instead of vermicrete?

      Thanks Neil. I ended up pouring another 2 inches today after your advice.

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