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Refractory concrete - Forno Bravo Forum: The Wood-Fired Oven Community

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New Forno Bravo Forum Feature

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.
- 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.

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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Refractory concrete

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  • Refractory concrete

    Good morning all,
    I am hoping to go for dome, shape oven which I was going to make out of clay, but they crack too easily and I've heard of Refractory concrete could I use that instead?
    Will I need to insulate it on the outside?
    I haven't made the pizza floor yet, would it be a good idea to make it out of the same stuff, and would I need to insulate the underside, as I have made a cavity with a door for storing wood and logs. I would be grateful for any help as always.

  • #2
    Re: Refractory concrete

    Will I need to insulate it on the outside?
    Yes, absolutely.
    would I need to insulate the underside
    Yes, absolutely. Your oven will be useless without insulation. You will burn cords of wood and only bring it up to pizza temperature with the greatest difficulty.
    Refractory concrete could I use that instead?
    Refractory concrete is useful in places like the UK where firebricks are irrationally expensive. It is more difficult to use than ordinary portland concretes.

    There are solid, and insulating castables. You want the solid kind for the inside of the dome. You will find that the insulating kind is far more expensive than vermiculite concrete, and has no particular benefit at the temperatures we use. Whatever you use to build your dome, you are probably going to want to spring for a firebrick floor. It's your cooking surface, and you may not be wanting to scrape peels over chalky concrete.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: Refractory concrete

      You can cast the floor in castable dense refractory, however if you do it in one piece it is likely to crack because of the uneven heating and resulting expansion. It is expensive stuff, you are probably better off using firebricks without mortar between them.
      Last edited by david s; 04-17-2011, 02:09 PM. Reason: spelling error
      Kindled with zeal and fired with passion.

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      • #4
        Re: Refractory concrete

        Thanks very much for the advice lads

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        • #5
          Re: Refractory concrete

          Yorky.
          Here is my build for a refractory concrete dome.
          Ive since knocked it over an redone it in fire brick but it served me well.
          Wood Fired Pizza Oven : BrikiWiki the home of online brickwork.

          Cheers, from a Lancy lad
          The English language was invented by people who couldnt spell.

          My Build.

          Books.

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          • #6
            Re: Refractory concrete

            Thanks mate, will prob go fore fire bricks.

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