web analytics
Arch to Dome Transition - Forno Bravo Forum: The Wood-Fired Oven Community


1 of 2 < >


Hello, Forno Bravo Community Forum members.

As many may have noticed already, the Community Forum site was briefly down today. While working on scheduled routine maintenance, we encountered an error when trying to add a software update. As the site is now back up and running, some of you may notice that some recent data has been misplaced from November 10th up to today. We are currently working on resolving the issue. The forum has full operational capabilities and we encourage all forum members to continue actively posting in the threads.

We apologize for any inconvenience that this issue may have caused you. The Forno Bravo family values each and every member of our community. If you have any issues or concerns, please feel free to let us know on our issues thread here:


Thank you for understanding.
2 of 2 < >

Forno Bravo Forum Thread Message

Hello, Forno Bravo Community Forum Members!

The Forno Bravo team has heard the feedback in regards to the community forum. We wanted to take the time to re-enforce our commitment to a fully engaged Forum with professional moderation.

Our top priority as a company is to fix all forum errors and issues that you are experiencing. As we are swiftly working on these problems, we want to say that we highly value the Forum Bravo Community Forum and every single community forum member.

We have set up this thread so that every member can address any concerns, issues and questions about the forum. Please feel free to ask whatever you would like in regards to the forum; let us know what issues you are experiencing so we can work on resolving them as fast as possible. However, we stress that we would like constructive engagement, so please be specific about the issue you are experiencing.

Thank you for all of your patience and continued support.

Link to topic: http://www.fornobravo.com/community/...with-new-forum
See more
See less

Arch to Dome Transition

  • Filter
  • Time
  • Show
Clear All
new posts

  • Arch to Dome Transition

    I am really nervous about the next few courses of brick. I am at a loss for how to connect the chains to the arch. To make the arch, I took the half bricks and cut them in half to make this so in essence, the arch you see in the pic below consists of 2.25" x 4.5" bricks laid horizontally against the form. Not understanding the physics behind this I am really nervous about the weight of the chains coming above the arch and what will they have to hold on to? I just can't imagine that arch holding any weight. Should I take it down and start with angle iron...its just I really like the look.

    Any expertise would be greatly appreciated.

    Attached Files
    Last edited by SuperT; 08-20-2007, 04:16 PM.

  • #2
    Re: Arch to Dome Transition


    I'm nearly at that stage too, and recommend you have a look at the thread at http://www.fornobravo.com/forum/f8/c....html#post9764 - there are some good suggestions on this topic.

    Balty Knowles used longer dome bricks to meet up with the arch, and some Dutch dude used longer arch bricks (there is a URL listed, but the English translation doesn't seem to work any longer). Both methods seem to achieve a similar result.

    Or you could develop a 'teardrop' shape at the front of your dome to enable your dome bricks to meet up with the arch.

    Perhaps some more experienced builders could weigh in here.

    Good luck,


    • #3
      Re: Arch to Dome Transition

      My concern with this arch is with the thrust from the bricks in the dome. When you are laying the brick on the thinner side called "shiners" in an arch the arch has to be very well designed and set because the line of thrust has to stay in the middle third of the bricks. in the case of a 2.5 in thickness you have .8 of an inch to play with. You might consider mitering the doorway bricks to match the angel of the bricks in the bottom couple of courses and continue on the same miter and you will have an angled siet of arch brick to transition the dome rings onto. Some masons even double the miter on the higher bricks in the doorway arch to smooth the exit of gases from the oven, in that case the bricks will have somewhat of a point. I know it is hard to describe in words but, your arch will be more stable if you lay the bricks on the wider 4.5 inch side.
      I will see if I can take some pictures for you to give a better idea of what I mean.
      "Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity. " Charles Mingus
      "Build at least two brick ovens...one to make all the mistakes on and the other to be just like you dreamed of!" Dutch


      • #4
        Re: Arch to Dome Transition

        I second Dutchoven's suggestion that the bricks laid on their narrow side means it's a little too weak. You don't have a side view, but I suspect the bricks don't go back very far, and remember that the oven curves in strongly at that point. You might consider re-doing your arch with a hollow form that you can leave in place until the dome is completed, and laying an arch with deeper bricks, laid on edge rather than face.

        Remind us again, what mortar are you using?

        My personal preference: I don't like angle irons. I think the huge difference in expansion between brick and iron makes that a weaker choice than even an indifferently built arch. That said, there are lots of successful ovens with angle irons.
        My geodesic oven project: part 1, part 2


        • #5
          Re: Arch to Dome Transition

          So TEAM FORNO

          After reviewing Balty's as well as the German page I couldn't read, I thought, what if I take the water saw or my angle grinder and using a whole brick on edge, fit it onto the arch bricks where the chains join and then have the other side sloped on the angle of the next chain. Kind of a hybrid of Balty's and German Dude...It might not be the prettiest, but that part will be covered anyways?

          See my diagram...am I on the right track?

          Attached Files


          • #6
            Re: Arch to Dome Transition

            I think that would work if this doesn't push the arch too far into the oven - you may need to do less than full length bricks in the middle with full length on the sides due to the curve of the dome away from the arch. If you stagger the joints rather than placing it directly over the first chain of arch bricks it should be stronger. Your idea saves you having to rebuild the arch, but that's extra cutting. I think building an arch is more challenging though. You will be able to see the seam on the underside of the arch - it will look like a double arch, but you don't have to tell anyone why it's there and can instead just tell them that a single arch did not pose the required degree of difficulty.



            • #7
              Re: Arch to Dome Transition

              I like that :-) extra difficulty; as if I needed any...I drew out the principle but like you said, I'll have to cut to fit to make sure the dome curve is maintained in the middle as opposed to the sides and did plan to stagger them. I'll let you guys know how it turns out.