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crack on outer shell of oven? - 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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crack on outer shell of oven?

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  • crack on outer shell of oven?

    hello,
    I am really trying hard to follow the curing guidelines, but seem to have produced a crack on the outer shell of the oven. I know hairline cracks are normal but reviewing the posts I didn't see anything on outer shell cracks. It is about as wide as the black line on a tape measure, so not very wide, but it is on the out side of the oven running from the base of the chimney down to the arch, under the arch and continues on the other side of the chimney inside up into the dome. The internal dome has some spiderweb like cracks that are tiny and from what I've read "normal"...I will get a photo of crack and post it.
    thanks every body!

  • #2
    Re: crack on outer shell of oven?

    pictures...hairlines on outside ok too?

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    • #3
      Re: crack on outer shell of oven?

      Willis,

      Is this a precast oven (FB?)?
      Check out my pictures here:
      http://www.fornobravo.com/forum/f8/les-build-4207.html

      If at first you don't succeed... Skydiving isn't for you.

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      • #4
        Re: crack on outer shell of oven?

        Les,
        Yes it is a Primavera 70. The crack is barley visible on the out side, and slightly more pronounced inside. It is hairline, but it makes me nervous that it is on the out side....FB via their support team says it is normal, but I am still skeptical.
        -w
        Last edited by 1willisrobbins; 09-20-2012, 02:38 PM.

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        • #5
          Re: crack on outer shell of oven?

          The only purpose the outer shell serves is to hold the insulation in place and keep water from entering into the insulation layer. Any cracks in the outer shell will allow water to enter and should be sealed up IMO and you can accomplish this by coating the oven in an elastomeric paint, but don"t do it until you have fired the oven about 10 times, to make sure it is perfectly dry. Sealing the oven on the outside also traps moisture on the inside. Outside shell cracks are caused by water inside turning to steam and creating pressure.
          You should talk to FB.
          Kindled with zeal and fired with passion.

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          • #6
            Re: crack on outer shell of oven?

            No need to be skeptical. It is normal, especially the way you described it. Mine got a hairline on the outside and a slightly bigger inside. We wish it wasn't there but it is and since we all insulate our ovens on the outside, That keeps the oven working properly.

            When I got my crack, I layed a piece of white insulation blanket over the hairline crack on the outside, made a small but very smokey fire just to see if any smoke escaped the crack and put any soot on the very white insulation blanket...and guess what...not a smudge of dark color appeared. That made me sooo happy. But even if it did a bit, I don't worry about it because I've got at least 2 layers of the insulation blanket around it & no heat or smoke escapes that and my oven performs as it should. I added some mortar to the outside but that was really just a waste of time IMO. As David said above, really let it dry out, finish your insulation and start cooking-smoking-baking something. That's when the fun starts.
            "Life is a banquet and most poor sons-of-bitches are starving to death." -Auntie Mame

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            • #7
              Re: crack on outer shell of oven?

              ".. finish your insulation and start cooking-smoking-baking something. That's when the fun starts."


              Dino, this oven is already finished.
              Kindled with zeal and fired with passion.

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