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Vermiculite board as floor insulation - 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:
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Vermiculite board as floor insulation

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  • Vermiculite board as floor insulation

    Hi

    Does anyone know, if it's possible to use 2" Vermiculite board as insulation under the firebrickfloor instead of FB board?

    Thanks

    Jesper

  • #2
    Re: Vermiculite board as floor insulation

    Five inches for vermiculite insulation. The "board" would be a cast of vermiculate and portland cement. My insulating layer looks a lot like a fat board.

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    • #3
      Re: Vermiculite board as floor insulation

      I don't think that one has been done before, but it could possibly work. The manufactured Vermiculite board will be better than Vermicrete, but i'd say you'd be better trying to find the Tech Spec and then making your own informed decision based upon Temp ratings, U values, etc.
      Please post any information you find, as it will always lead to furthering of knowledge!

      Ciao!

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      • #4
        Re: Vermiculite board as floor insulation

        Vermiculite board is a pretty old-fashioned material in the states. Jewelers used to use it as a soldering board. I think (this is just a guess) that the binder is waterglass: there's nothing concrete like about the stuff. It should work fine, but I think you will need more than two inches. It's not as effective as cal-sil or mineral fiber board.
        My geodesic oven project: part 1, part 2

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        • #5
          Re: Vermiculite board as floor insulation

          Originally posted by jesperfl View Post
          Hi

          Does anyone know, if it's possible to use 2" Vermiculite board as insulation under the firebrickfloor instead of FB board?

          Thanks

          Jesper
          Hi Jesper
          I used a 1" vermiculite board over 4 or 5" of vermicrete - with a thin layer of sand mixed with fireclay to level it. So far I haven't had any problems but it is exremely brittle while you are handling it and will break like a biscuit (read cookie) - but once in place it seems to sit OK. I finally trimmed the corners off last week while doing the stucco finish on the dome. I'd say the ceramic board is more efficient - and I intended to use that but couldn't find any here at the time.
          good luck
          Aidan
          Amac
          Link to my WFO build

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          • #6
            Re: Vermiculite board as floor insulation

            I see that you are from Denmark. I am planning a build here and have started searching for places to buy materials etc.

            Is it because you cannot find the FB board in Denmark, and are looking for substitutes??

            This place sells the ceramic fiber blanket (Insulfrax, similar to FB blanket). Maybe they also sell FB board? I have not enquired about prices yet. If you contact them, I would be very interested in prices ;-)

            Norisol - Insulfrax Højtemperaturisolering

            Ulrik

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            • #7
              Re: Vermiculite board as floor insulation

              Hi
              Thanks for all the replys

              I contacted a oven specialist, and it is possible to use vermiculite board as floor insulation.

              His suggestion was, 1" of vermiculite board on top of 2" leca blocks, that should be sufficient and much cheaper then fb board.


              Hej Ulrik you are more then velcome to contact me I have prices from many of the dealers in Denmark and some good ideas where to by what.

              my number is 24450966

              thanks Jesper

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