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Cracks & leaking smoke - Forno Bravo Forum: The Wood-Fired Oven Community



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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Cracks & leaking smoke

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  • Cracks & leaking smoke

    Just fired up my new pizza & bread oven. I'd finished it last fall & worked it up to temperature gradually over 2 weeks. Used it three times, then wanted to change the tilt of the entry way and had to wait until spring. So now I've finished fixing it and lit it up for the first time, and noticed that there was some (not a lot) smoke coming out of the center of the roof. I thought it might have been doing that last fall, but had forgotten about it.

    Looking inside, I see there is a crack front to back of the dome of the top, and one from that crack down to one side. I built the sides of the oven with fire brick but purchased a pre-formed dome to cap it all. It's the pre-fab dome that has cracked.

    1. Is this a problem? (It can't be good for insulation.)
    2. If so, what can I do about it, if anything?

    Needless to say, after so much work (5 years in the making, I'm embarrassed to say) this is producing a lot of anxiety!

    If there's already an answer out there, just point me in the right direction.

  • #2
    Re: Cracks & leaking smoke

    The fact that the dome has cracked should not be too much of a problem because as it is a dome it will be self supporting even if it cracked into several pieces it can't collapse. You don't say whether the dome is one piece or a few, but any large pieces of refractory are subject to cracking so a number of interlocking pieces are preferable IMO. The cracks you have now got have simply created those pieces where they want to. Regarding the leaking smoke, you do have an issue because as you say you will be losing heat. If you have leaking smoke then presumably you don't have any insulation over your dome or perhaps you also have cracks in the outer shell in which case will provide an entry for water to get in by.Can you post a photo?
    Last edited by david s; 06-18-2013, 08:55 PM.
    Kindled with zeal and fired with passion.


    • #3
      Re: Cracks & leaking smoke

      Thanks for your replay. I'll post a photo later, but I have the oven under an open-sided sort of shed. No rain or snow will get directly onto/into it, though I suppose it might under extreme, blowing conditions. You are right, the outer layer is also cracked, and I assume the insulation is cracked as well since the smoke gets out. I made many layers of vermiculite/Portland to create the insulating layer, which is around 5 inches thick.


      • #4
        Re: Cracks & leaking smoke

        Plug up the cracks in the outer shell and render over them. Try to keep that new layer damp for a week by covering with plastic. Forget the cracks in the inner dome. Any attempt to fix them usually results in failure.
        Kindled with zeal and fired with passion.


        • #5
          Re: Cracks & leaking smoke

          Thanks -- I'll see if I can stuff more insulation down in -- maybe widen the crack a bit -- and then cover it with the stucco. Will keep it moist and won't use it for a couple of weeks, then will bring it up to heat slowly. Sound ok?

          Here are pictures.


          • #6
            Re: Cracks & leaking smoke

            Those photos didn't show up very well, so here's a link to an album that shows all three:

            imgur: the simple image sharer