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

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Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

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To create this migration path we used vBulletin5’s default album structure. Unfortunately, it won’t work like the “PhotoPlog” but is an album/gallery component on the forum now.
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Vermiculite

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  • Vermiculite

    My local big-box retailer has 4-cubic-foot bags of vermiculite ($9 ea.) sold as "MicaFlake attic insulation." It's 100% vermiculite. I haven't opened the bag yet, but it looks like fine flakes, 1-2 mm across. Does this sound okay as loose oven insulation?
    Picasa web album
    Oven-building thread

  • #2
    Re: Vermiculite

    regular vermiculite is mica popped like popcorn - i think

    depends if it is flat flakes or fluffy

    Comment


    • #3
      Re: Vermiculite

      I don't think that's right. The price alone makes me think it's not the right stuff. I think typically you'll spend $20-$30 on a bag. Also, if it's designed for attic insulation, I'm guessing that it's not designed for high heat.
      However, since this is extra insulation, after the blanket- I doubt it will hurt anything.
      Check out my oven progress here: http://www.fornobravo.com/forum/phot...dex.php?u=4147

      See ALL of my pictures here:
      http://picasaweb.google.com/Brevenc/...OutdoorKitchen

      Comment


      • #4
        Re: Vermiculite

        Not sure about the contents of what you're looking at, but as far as price goes, around here you can get a 4 cf bag of vermiculite for anywhere from 13 to 20 dollars a bag.

        My verm. is brownish, and the particles are about the size of scoopable (the clumping kind) kitty litter. Or maybe kosher salt.

        If it says it's 100% vermiculite, I don't see a problem. My verm. came from a pool supply place, so what it's originally intended for isn't really important sometimes.

        Unless they're building pools in hades now...
        Elizabeth

        http://www.fornobravo.com/forum/f8/e...html#post41545

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        • #5
          Re: Vermiculite

          You may be right Elizabeth.
          I checked out the manufacturer of the stuff I used and they do have differnent grades and uses, some with additives, some withou. But it's all basically the same.

          In this application, I would guess that the course stuff would be best. Aside form the insulating properties of the vermiculite itself, the air pockets inbetween each of the little pieces of vermiculite help insulate. But it should all work.
          Check out my oven progress here: http://www.fornobravo.com/forum/phot...dex.php?u=4147

          See ALL of my pictures here:
          http://picasaweb.google.com/Brevenc/...OutdoorKitchen

          Comment


          • #6
            Re: Vermiculite

            Thanks for the info! I'll have to open a bag and take a closer look. The only local pool supplier with vermiculite says it comes pre-mixed with cement, so that's out.

            The bag I have does say it has been expanded with heat already, but it might be a finer grade than some.
            Picasa web album
            Oven-building thread

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            • #7
              Re: Vermiculite

              My supplier offered me the vermiculite with portland added- I was strongly tempted, but I didn't know what the ratio was, so I said no. It might be a good way to avoid having to mix it, though... I just didn't have the intestinal fortitude to attempt to figure the ratio on my own... math is NOT my thing.
              Elizabeth

              http://www.fornobravo.com/forum/f8/e...html#post41545

              Comment


              • #8
                Re: Vermiculite

                Vermiculite is normally "exfoliated" at over 1000c. The mix ratio is usually by volume. The normal ratio is say 6:1, that is 6 scoops of V'lite to 1 scoop of cement. We usually use Cement Fondue as the binder. Exfoliated V'lite looks like little accordians.Size 3 is about right. 100litre bags are $30 here in Aus.

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