web analytics
cracked arch and chimney - Forno Bravo Forum: The Wood-Fired Oven Community



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!

Forno Bravo
See more
See less

cracked arch and chimney

  • Filter
  • Time
  • Show
Clear All
new posts

  • cracked arch and chimney

    I rebuilt the arch for the second time and after using it for awhile it cracks and breaks loose and the chimney also cracks. I was thinking about reinforcing the arch with flat iron and bend it to the the shape of the arch to support it. Any other suggestions.

  • #2
    Re: cracked arch and chimney

    I had the same problem. This web page will help you to understand forces on an arch

    Auroville Earth Institute, training courses, workshops on Vaults, Arches, Domes(VAD), stabilized rammed earth walls, compressed earth blocks, vaulted structures, compressed stabilised earth blocks, rammed earth.

    What I did to fix my issue is I built a form put about an 1-1/2inches of vermiculite portland cement mix on the arch itself then some re bar and then filled it with regular cement. I held back from the face of my firebrick so that I have room to put a stone facing. This concrete will also have extra support when I build the housing around the oven so right now it's just standing there.
    Hope this helps


    • #3
      Re: cracked arch and chimney

      Is your arch in direct contact with the inner parts of the oven or did you leave a small insulating space to isolate it? I believe that the temp. differential in the outer arch is a major cause of cracking problems. The insulating gap reduces both heat conduction to the outside and also reduces the temp differential between the inner and outer faces of the arch.
      Kindled with zeal and fired with passion.


      • #4
        Re: cracked arch and chimney

        I know I missed that on this oven...live and learn. So yes it is in direct contact.


        • #5
          Re: cracked arch and chimney

          The main problem with that arch is excess outward thrust. It needs more mass to buttress the arch.


          • #6
            Re: cracked arch and chimney

            Yes the arch is in contact with the dome. The problem is that the outer part of the arch is cracking. I guess the weight of the chimmy is to much. I was going to put a quarter inch by one inch flat steel bar shaped to the arch to reinforce it. The sides of the arch wall are fine and they do not crack. Just the front part of the arch falls out. Any suggestions.


            • #7
              Re: cracked arch and chimney

              Any ideas for the arch how to redow it