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Insulated Hearth - Forno Bravo Forum: The Wood-Fired Oven Community

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Forno Bravo Forum Community,

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.
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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.

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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Insulated Hearth

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  • Insulated Hearth

    I'm getting ready to pour the insulated hearth for the Premio 120 Modular Oven. This is turning into a real scavenger hunt. I notice that the insulated hearth is poured using Calcium Aluminate Cenent to create refractoty concrete. Altrnatively regular concrete. Will the regular concrete hold up? Or should I go the distance and use the Refractory Concrete?

    TIA

    Howie

  • #2
    Hi Howie,

    I think you really only need Calcium Aluminate concrete in a commercial oven that is fired 24-hours a day. A large percentage of home ovens are installed using standard concrete (in fact there are installation guides from producers that recommend a simple, standard concrete hearth without any insulation). If you have an easy, local source and it isn't expensive, you could go for the calcium aluminate, as it will last longer (probably long after we are all gone) and perhaps heat up a little faster, but the difference is not worth a lot of effort.

    James
    Pizza Ovens
    Outdoor Fireplaces

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    • #3
      Would this be true for the Pompeii as well? I do have an inexpensive and easy source of this concrete (and mortar) and was already planning on purchasing it for the oven build.

      It never occurred to me to use it in pouring the hearth. I'm planning on trying to do the island hearth, BTW, which seems slightly challenging since I have to pour the island while the perlite insulative layer is still wet, which means removing the island forms. Time will be important.

      Tarik
      --
      Tarik

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      • #4
        if you are already pouring an adequate support layer as described in the other thread about the island hearth, i believe you could just make a circular form out of sheet metal to separate the thermal concrete from the surrounding perlite layer, and just leave the metal form in the concrete. i would set in a half inch or so beneath the surface.
        -Paul
        overdo it or don't do it at all!

        My 2005 pompeii build

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        • #5
          Logical... dunno why I didn't think of it! :-)

          I was not planning on pouring an extra support layer.

          The back 2/3's of the oven hearth will be supported by sitting on a 6+ inch poured concrete foundation poured behind a 3 foot high, 6-7 inch thick concrete retaining wall.

          Only the front 32 inches will be supported by concrete blocks as in the normal design. I am reasonably confident that I don't need the concrete layer under the insulation layer for this as this would only be supporting the throat of the oven.

          Let me know if you think otherwise.

          Tarik
          --
          Tarik

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          • #6
            Originally posted by aikitarik
            Logical... dunno why I didn't think of it! :-)

            How do you think I feel?

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