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How much vermiculite - Forno Bravo Forum: The Wood-Fired Oven Community


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How much vermiculite

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  • How much vermiculite

    Hi would anyone know how many litres of vermiculite one would need when building a 39inch WFO.Intend putting 100mm in Hearth and 100mm in dome. This would be based on 6:1 for hearth and 12:1for dome

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    Re: How much vermiculite

    V ( sphere) = 4/3 phi rxrxr. Calculate outer radius minus inner radius and remember it's half a sphere.
    V ( slab) = lxbxh

    About 400 L at a rough guess.

    I use 10:1 over the dome, I find 12: 1 a bit hard to make it stick on the vertical. Once it starts to lean in you can make the brew weaker.
    Last edited by david s; 03-20-2013, 04:14 AM.
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