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Oven crack - 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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- 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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  • Oven crack

    I have built a pompeii style oven with and now have a crack. I have a steel frame with two cast iron doors on the front. The dome is enclosed with 1 1/2 inches of insulation followed by 2 inches of vermiculite & cement. This covered with cement and stucco. I have dried and fired as per the directions. The crack started when I reached over 400F and starts at the frame of the door through the arch up to the chimney and along the outside of the dome. The dome is intact and the crack seems to be on the outside only as the dome on the outside does not heat up and I can not find any cracks on the inside. I tried to repair it once with high heat mortar, bricks and vermiculite but the crack reappeared in the same place. I though the steel frame may have caused the crack as it may expand when heated up causing the bricks around it to spread. I have since cut the frame in the top center, near the start of the crack. This did not solve the problem. Does anyone have any ideas what is causing the crack and how do I repair it.

    Gino

  • #2
    Re: Oven crack

    Hi Gino,
    like you, I built a 40" Pompeii with a heavy angle iron and arch bar lintel with 2 cast doors but I allowed for a different expansion coeficient between the steel and the firebricks.
    My oven has been in use now for a year with no problems or cracks as the steel frame can move independently from the bricks.
    Check out the.pdf attachment for the finer details.
    More discussion is at:

    http://www.fornobravo.com/forum/f6/t...cern-1859.html

    As far as the repairs are concerned, I need a picture or some to see the damage, but I would be tempted to cut the crack out with a grinder to say 5-8mm wide and pack the groove with stands of fibreglass plugged with either refractory cement or mortar.

    Neill
    Attached Files
    Last edited by nissanneill; 08-15-2008, 03:18 AM.
    Prevention is better than cure, - do it right the first time!

    The more I learn, the more I realise how little I know


    Neillís Pompeiii #1
    http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
    Neillís kitchen underway
    http://www.fornobravo.com/forum/f35/...rway-4591.html

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    • #3
      Re: Oven crack

      Steel does have a higher coefficient of expansion from masonry: it expands more in heat, and it also heats up much faster than the surrounding brick, which would tend to accentuate the problem. You may want to find some way for the steel frame to float in the masonry surround, perhaps packed with the kind of fiber rope that's used in woodstove door seals.
      My geodesic oven project: part 1, part 2

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