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Modular hearth for Casa2G - 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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Modular hearth for Casa2G

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  • Modular hearth for Casa2G

    Hi all-

    First post, about to embark on first WFO with a Casa2G that I plan to install with an igloo mosaic finish on a metal stand. My plan is to weld 2" L angle as the frame with 1" L angle as the cross members and rebar on top of that going the other direction. Then pour a 4" hearth on top of this frame. The hearth could in theory then be placed on a welded metal stand.

    So the questions to the experts on the forum:
    - Is 4" enough for the hearth?
    - Any guess on how heavy this will be? Should I pour the hearth with the frame on the stand already?
    - Should/could it be vermicrete?
    - Is the FB kit board fine to put directly on this hearth or should I add a second layer of something else?

    Thanks in advance for the advice. I'll post pics as the project develops.



  • #2
    Re: Modular hearth for Casa2G

    - Is 4" enough for the hearth?
    - Any guess on how heavy this will be?
    Normal weight concrete -- a mixture or sand, cement, and stone gravel -- has an accepted density of 145 pounds per cubic foot. Divide by three for a four inch slab per square foot.
    Should I pour the hearth with the frame on the stand already?
    Yes. Lifting that big a slab is an unneeded and potentially hazardous rigging job.
    - Should/could it be vermicrete?
    No. Vermiculite or perlite concrete has no tensile strength.
    - Is the FB kit board fine to put directly on this hearth or should I add a second layer of something else?
    If your slab if flat, nothing else is needed. If not, a mixture of fireclay and sand can be used to level it. I placed my insblock19 boards in wet concrete with good results.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Modular hearth for Casa2G

      Hey Ron,

      If you pour a traditional concrete hearth, and screed it reasonably well, you will be able to lay the FB Board directly on the concrete without anything to level it.

      Think of it this way -- the concrete is 100% structural (it holds everything in place) and it does not provide insulation value. The FB Board is 100% insulation (it does a great job of blocking heat in the oven) and it does not provide any structural value.

      It's easy!
      Pizza Ovens
      Outdoor Fireplaces


      • #4
        Re: Modular hearth for Casa2G

        Do you even need a concrete hearth? Why not just use a piece of plate steel.


        • #5
          Re: Modular hearth for Casa2G

          I originally liked the idea of using a steel plate for my build. What immediately turned me off on the idea were the cost of the plate stock and the additional cost of having it cut to a custom shape/size.
          The concrete hearth I poured cost me at least 75% less.


          My 34" WFO build

          Weber 22-OTG / Ugly Drum Smoker / 34" WFO