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Hearth Insulation FB Board / Vermicrete - Forno Bravo Forum: The Wood-Fired Oven Community



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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Hearth Insulation FB Board / Vermicrete

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  • Hearth Insulation FB Board / Vermicrete

    I poured my hearth structural layer last weekend and it turned out perfect. 4” of heavily reinforced (1/2” rebar on 6-inch centers plus wire mesh) 5500 psi concrete. Now I am getting ready for the insulating layer. I have already purchased 5 cubic feet of vermiculite and was planning on mixing up some vermicrete next weekend. However when browsing the Forno Bravo store for supplies, I ordered three sheets of 24”x36”x2” FB Board ($ouch$). So the question is…..

    Should I go with just the FB Board or do I need to put a thin vermicrete layer (1” to 2”) on top of the FB Board? Not necessarily for extra insulation, but to fill the gap between the edge of the FB Board and the edge of the hearth. As shown in attachment:

  • #2
    Re: Hearth Insulation FB Board / Vermicrete

    Unless you don't have enough board to go under your oven, there's no need to fill around the insulating board with vermiculite concrete. The goal is to completely surround your oven with insulation: additional outboard from the oven/insulation profile won't do any good.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Hearth Insulation FB Board / Vermicrete

      I guess the question that I am asking is does it have to be one (FB Board) or the other (vermicrete)? Does anyone use vermicrete over FB board?


      • #4
        Re: Hearth Insulation FB Board / Vermicrete

        Hey Nabber,

        A few builders have done that, though it might be overkill -- plus you have to work with two materials. If you are really serious about floor insulation and plan on having really, really long parties, you should put the FB Board on top of the vermiculite, as it is the more efficient material between the two.

        Still, for most cases, the standard 2" FB Board is more than enough insulation, and is roughly equal to 4" of vermiculite concrete.

        Pizza Ovens
        Outdoor Fireplaces


        • #5
          Re: Hearth Insulation FB Board / Vermicrete

          I used the 2" FB board on my oven build - it works great! Easy to cut and I was able to start placing my oven floor bricks immeadiately after installaion. No need to wait for Vermicrete to cure.

          I covered the oven with the FB ceramic insulation (had enough for 2 layers). Then poured loose Vermiculite in after I finished the enclosure so the entire oven is wrapped in an insulation cocoon.

          Last edited by christo; 07-23-2009, 09:42 AM.
          My oven progress -


          • #6
            Re: Hearth Insulation FB Board / Vermicrete

            OK thanks.

            I guess that I have been stuck on the vermicrete idea for such a long time (poured my foundation last September) that when I switched gears to thinking about FB Board, I was temporarily confused. THe FB Board should be here this Saturday. I cant' wait.


            • #7
              Re: Hearth Insulation FB Board / Vermicrete

              If I were to build my hearth again, I would use 3-4 inches of vermiculite, covered with a 2 inch FB board.

              San Luis Obispo

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