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Cracks in thermo mass, what to do? - Forno Bravo Forum: The Wood-Fired Oven Community

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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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Cracks in thermo mass, what to do?

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  • Cracks in thermo mass, what to do?

    I finished building my dome and covered the dome 4 days ago with 1 inch of refractory mortar covered it with blankets and plastic sheeting. This morning I looked at it and it looked liked a map, many small hair line cracks everywhere. Is this something I should worry about? Should I add another coat of mortar? I'm going let it sit for a week and do a slow 6 or 7 day low to high ramp fire, before covering it in ceramic cast, then ceramic blankets and render it in stucco. I think another coat of mortar is over kill. Lets hear what you think. Thanks in advance for your response.

    Pompeii in Japan

    Laurentius

  • #2
    Re: Cracks in thermo mass, what to do?

    How to get this off of "Forum Guidelines"?

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    • #3
      Re: Cracks in thermo mass, what to do?

      Hairline cracks in your parging coat of refractory mortar are nothing to worry about. No one will ever see it. It's unlikely to fall off, and even if it did you still have lots of thermal mass. Your plan to proceed sounds like a good one.
      My geodesic oven project: part 1, part 2

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      • #4
        Re: Cracks in thermo mass, what to do?

        Laurentius,

        Where in Japan are you? Would love to see photos of your build.

        John

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        • #5
          Re: Cracks in thermo mass, what to do?

          Hi Gianni,

          I'm in a small coastal town named Kamogawa, in Chiba-ken, a 2 hour train ride from Tokyo. I'll make some photos in the next few days. My chimney arrived yesterday. The info from the forum, made it so easy.

          Laurentius

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          • #6
            Re: Cracks in thermo mass, what to do?

            Don't worry about the cracks. Cracks in the thermal mass are almost inevitable.

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