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Exterior crack - 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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Exterior crack

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  • Exterior crack

    All,

    I have some external crack issues I am trying to resolve, and I am looking for some ideas or thoughts on my planned direction forward.

    First, the story of my crack. It is a hairline crack that only rears its ugly head during firing. It runs just off center of my outer arch, and propagates up the center of the chimney in the outer finish layer of stucco

    The oven itself is blanket insulated, with a layer of vermicrete over that. The entrance arch where the crack is, is only insulated with vermicrete and the whole outer layer is stucco.

    So, right now I am planning to remove all layers of verm and stucco down to firebrick on the tunnel and placing blanket insulation over the whole entrance and arch back to the dome. I was also planning on wrapping the chimney in blanket. Now comes the tricky part. For replacing the concrete/stucco finish I was going to pour a finish concrete sleeve to slide over the chimney, and then from there replace all other outer finish with formed and poured concrete panels over the tunnel. I can then use caulking to seal between concrete/stucco panels.

    My whole thought process here is to isolate the finish layer from the oven structure itself, allowing the newly placed soft insulation and caulking to absorb the expansion of the tunnel.

    This may be an extreme approach to eliminating the crack in the front of my oven, but I am rather anal and need to have a crack free outer surface, or at least not have the crack staring me in the face every time I use my oven.

    Thoughts and alternative ideas are greatly welcome.


    John

  • #2
    Re: Exterior crack

    I can understand you not wanting to stare at the crack...
    Can you post some pictures?
    Drake
    My Oven Thread:
    http://www.fornobravo.com/forum/f8/d...-oven-633.html

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    • #3
      Re: Exterior crack

      I've had success with fixing exterior cracks by covering the whole dome with fine chicken wire and rendering over the existing cracked layer. Your render mix should contain lime and cement. A normal cement render has very little elasticity, try a 4:1:1 sand, cement, lime mix.
      Kindled with zeal and fired with passion.

      Comment


      • #4
        Re: Exterior crack

        If the cracks are only hairline then an acrylic render that has good flexibility is suitable, but should only be applied after all moisture has been eliminated, which may take several decent cooking firings.
        Kindled with zeal and fired with passion.

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