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

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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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

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    • #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

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      • #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

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          • #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

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              • #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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