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? on ratio of vermiculite to cement - Forno Bravo Forum: The Wood-Fired Oven Community

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  • ? on ratio of vermiculite to cement

    is the ratio volume or #?

  • #2
    Ratio

    I use a standard ratio of six vermiculite to one Portland by volume. It's not a critical mix, but it's good to get close. Do it by shovelfuls, pails, what have you.

    Jim
    "Made are tools, and born are hands"--William Blake, 1757-1827

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    • #3
      Re: ? on ratio of vermiculite to cement

      Ratios by volume!!

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      • #4
        Re: ? on ratio of vermiculite to cement

        I did 8:1 under the dome, probably could've done 10:1 really, definitely by volume.
        Time flies like an arrow; Fruit Flies like a banana.

        My oven (thus far): http://www.tinyurl.com/ogorirsoven

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        • #5
          Re: ? on ratio of vermiculite to cement

          Under the floor you need the strength. Should be around 5:1. Over the dome go as lean as you dare. I use 10:1
          Kindled with zeal and fired with passion.

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