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Pompeii oven opening - 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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Pompeii oven opening

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  • Pompeii oven opening

    Hello all from Queensland Australia. I'm trying to build a 900mm dome oven using the Forno Bravo pompeii plans, have completed the block stand and have reached the tough bit

    I'm trying to decide on a design for the oven arch and flue support. Do you think it would be structurally sound to build a half-brick arch as an opening to the dome separated by board insulation from an arched masonry box to support the flue and transition? The dome arches on this site don't seem to be bonded into the dome except by mortar.

    I'm thinking to separate the two arches because of concern that having a large volume of masonry directly mortared to the dome and not insulated will lead to significant heat loss. It seems obvious but I can't find any reference to this issue on the site.

    There has been some discussion on cost and availability of 'fireclay'. Here, our local Bunnings sells 20kg bags of a product labelled as fireclay for less than $10. It states on the packaging that it is used by bricklayers for general mortar purposes where the sand is deficient in clay. Could this be the fireclay referred to in the plans?

    Any suggestions on these points would be really appreciated

    Stuart

  • #2
    Re: Pompeii oven opening

    Hi Stuart my bunnings didnt have the fire clay so as per aussie Russell jeavons book im using orange brickies sand has the clay in it,it comes in white as well.Russell uses his ovens commercialy 2 days a week for the
    last few years no probs mate.look up his ovens in the reseraunt threads
    by nissanneil.
    Cheers Peter

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    • #3
      Re: Pompeii oven opening

      Woodsman, I thought the same thing and am isolating my chimney structure from my dome by about 1cm gap. I also came up with a stronger arch design for my free standing chimney.

      http://www.fornobravo.com/forum/f28/...arch-4882.html


      ...

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      • #4
        Re: Pompeii oven opening

        I did not isolate my entry from the oven and don't believe I'm seeing an appreciable degredation in performance.

        My entry arch is one piece that also supports the oven opening. I see no reason why it could not have been made in two pieces.

        If it looks like a lot of work and you don't plan to run the oven for a few days at a time, I'd skip it. After a pizza night, my oven is still too hot the next morning to bake bread.

        Christo
        My oven progress -
        http://www.fornobravo.com/forum/f8/c...cina-1227.html
        sigpic

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        • #5
          Re: Pompeii oven opening

          I guess the opening is a weak point in the oven w.r.t. the expansion forces during heat up. They will tend to "rip it appart" (widen the opening). It is sensibel to try to hold these forces by making a solid arch and opening (extending radially) so that the opening does not give in to these forces and reveal it with a crack.

          karl

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