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

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vermiculite

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  • vermiculite

    I found a very reasonably priced source for vermiculite. It is some distance away. The company says they use it for packing material and it reads No. 4 on the package. I can't find anything on the internet indicating just how large size No. 4 is.
    Does anyone know the answer to this and is it suitable for the portland/insulation layer.

    thanks,
    Dave

  • #2
    Re: vermiculite

    This chart doesn't indicate grade either, but my guess is the Premium grade (presumably #1) would be the most expensive. The vermiculite I bought didn't have particularly large particles, nor were they super fine. Somewhere in the middle I'd guess. Have you checked HD?

    Vermiculite Grades

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    • #3
      Re: vermiculite

      HD has 2 cubic foot bags for $19.97. I can get 4 cu. ft. of No. 4 for $13.

      Dave

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      • #4
        Re: vermiculite

        4 cu ft for $13 is what I paid. Get about 10 bags if you insulate both the dome and the hearth with it. Maybe the guy can open a bag and describe the size to you, the bigger the better. I had one bag of a very fine vermiculite and it was very easy to work with but I dont think it insulates that well
        my own Quest for Fire:
        http://www.flickr.com/photos/leckig/

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        • #5
          Re: vermiculite

          Normally Perlite is cheaper than vermiculite. I just purchased 45 2 cu.ft bags for approx. 17 $ per bag

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          • #6
            Re: vermiculite

            Originally posted by md.guthrie View Post
            I just purchased 45 2 cu.ft bags for approx. 17 $ per bag
            Let me get this straight. You paid $765 for vermiculite?
            If they were used solely for insulation purposes you would have saved money using ceramic boards and blankets instead.
            George

            My 34" WFO build

            Weber 22-OTG / Ugly Drum Smoker / 34" WFO

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            • #7
              Re: vermiculite

              Did both. I want to retain maximum heat...... Trying to get it right the first time...

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              • #8
                Re: vermiculite

                man... nearly $800 on vermiculite. This is about half what I spent on the whole 42 inch oven.
                my own Quest for Fire:
                http://www.flickr.com/photos/leckig/

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                • #9
                  Re: vermiculite

                  My No. 4 vermiculite finally came in yesterday. It was $13/4cu. ft. bag. The pieces vary greatly in size with the largest about 3/4 x 1/2 in down to quite small pieces.
                  Now the question is: at what ratio do I mix it. I see blogs using 1:6 up to 1:10.
                  Is there an ideal ratio? Any tips on mixing and finishing would be greatly appreciated.

                  Dave

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                  • #10
                    Re: vermiculite

                    for under the hearth insulation you do 1:5 - because of the weight that will sit on it. I very much recommend you buy the insulation board as well, I wish I did.

                    For dome insulation: the less cement the better, but less cement you put in the mix the harder it is to apply. Most people do 1:10. The way I did mine was also 1:10, one day I piled up about 6 inch layer on the dome about 12 inches high, I let it set for a day and I continued the next day all the way to the top.

                    When I tried to do it all in one day it was always falling down.
                    my own Quest for Fire:
                    http://www.flickr.com/photos/leckig/

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