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vermiculite/cement 5:1 question - Forno Bravo Forum: The Wood-Fired Oven Community

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  • vermiculite/cement 5:1 question

    Sorry if this one is old. I can't find it.
    I keep reading about mixing vermiculite or perlite with cement at 5:1. What are we measuring? 5 what to 1 what?
    Thanks

  • #2
    Re: vermiculite/cement 5:1 question

    By volume.

    For example, five shovel fulls of perlite and one shovel full of cement.

    And just enough water to make it "workable".

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    • #3
      Re: vermiculite/cement 5:1 question

      mixing of materials is always assumed by volume unless otherwise specified, such as by weight

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      • #4
        Re: vermiculite/cement 5:1 question

        so for example if I know it took so many bags of cement to make my structure slab, I can just sort of estimate how many bags it takes to make a slab of a certain size and apply that to the verm/cement mixture? So if I want to replicate the area of the slab, all I have to do is replace some of the cement with the vermiculite for the same total?
        Thanks
        Kim

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        • #5
          Re: vermiculite/cement 5:1 question

          For all practical purposes the volume of the vermiculite (say, a four cubic foot bag) will be the volume of your vermiculite concrete. The portland doesn't take up that much room.
          My geodesic oven project: part 1, part 2

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          • #6
            Re: vermiculite/cement 5:1 question

            Thanks. Very helpful. How did we ever get by before the Internet?
            Kim

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            • #7
              Re: vermiculite/cement 5:1 question

              Before the internet I think we ordered out for pizza.

              I poured my insulating layer last Friday and found for the 36 inch oven it took all of 3 four cu. ft. bags of Perlite to fill my forms to the 4 inch level.

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              • #8
                Re: vermiculite/cement 5:1 question

                I'm finding it won't take much too. Maybe four or five - tops. And I think $8.75/ 4c.f. bag is probably reasonable.
                Thanks

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