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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

    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...

              Comment


              • #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/

                Comment


                • #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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