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vermiculite granule size? - Forno Bravo Forum: The Wood-Fired Oven Community

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vermiculite granule size?

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  • vermiculite granule size?

    Hello,

    This is my first posting. I live the Buffalo, New York area and am in the process of ordering vermiculite. Does the size of the granule matter? I have an option of large, medium, or fine. Thanks for any help you can give me.

    Rob

  • #2
    Re: vermiculite granule size?

    I would think the coarser the better, since you are trying to get air spaces between the concrete matrix. Also, the big chunks might be less dusty.

    Be sure it's the agricultural vermiculite, not silicone treated for use in domestic insulation. The silicone makes it hard to combine into insulating concrete.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: vermiculite granule size?

      Hi Rob, I have just poured my foundation and topped it with 100mm vermiculite which was graded as "#3 exfoliated vermiculite". It says on the 6Kg bags that it is for horticulture and insulation and the company seels heaps of it to people such as us for our ovens.
      A picture of the mix is on; fornobravo.com/forum/f8/neills-pompeii-1-a-2005.html
      It was mixed between 5 and 6 : 1 with portland cement and has set off nicely over the past week

      Neill
      Prevention is better than cure, - do it right the first time!

      The more I learn, the more I realise how little I know


      Neillís Pompeiii #1
      http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
      Neillís kitchen underway
      http://www.fornobravo.com/forum/f35/...rway-4591.html

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