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Perlite Ratio - Forno Bravo Forum: The Wood-Fired Oven Community

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Perlite Ratio

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  • Perlite Ratio

    Hello everyone

    What is the ratio of perlite, cement, and sand to build a pizza oven dome?
    What is the thickness required to build the dome before the layer insulation?



    Thanks

  • #2
    Re: Perlite Ratio

    Originally posted by Shay View Post
    Hello everyone

    What is the ratio of perlite, cement, and sand to build a pizza oven dome?
    What is the thickness required to build the dome before the layer insulation?



    Thanks
    If you build the dome with perlite in the mix it will not be dense enough to store heat.
    Generally the dome thickness is between 2-4" thick depending on the materials used.
    Suggest you download the free plans or read lots of build threads to get a better idea of design principles.
    Kindled with zeal and fired with passion.

    Comment


    • #3
      Re: Perlite Ratio

      Thanks

      I have just design and built the first arc already (attached a picture)
      Now I have to build the rest of the oven and I wanted to build from perlite and cement
      But I do not know about the right ratio
      Attached Files
      Last edited by Shay; 09-22-2012, 05:34 AM.

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      • #4
        Re: Perlite Ratio

        Like David said, you cant build an oven out of perlite and cement, it just wont work.
        The English language was invented by people who couldnt spell.

        My Build.

        Books.

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        • #5
          Re: Perlite Ratio

          if so what are my options instead if I do not want to
          build from bricks?

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          • #6
            Re: Perlite Ratio

            Use a dense castable refractory. Search the forum for this material and read all you can. You can buy the stuff from a refractory supplier.
            Kindled with zeal and fired with passion.

            Comment


            • #7
              Re: Perlite Ratio

              Perlite and its neighbour Vermiculite are insulators, and wont hold heat. As David S mentioned use a Refractory dense castable, a 1350c grade is most likely the easiest and cheapest option. approx $25-$30/25 kg bag.Dont know the size of your oven, but if you calculate the volume of the prefered dome, you can use the 80 bags/m3 figure to work out your requirement, or if your old like me, 2 bags/Ft3. THEN use your Perlite mix over that dome to keep the heat in.

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