web analytics
dome construction HELP - 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

dome construction HELP

  • Filter
  • Time
  • Show
Clear All
new posts

  • dome construction HELP

    Ok I need help on this. Ive gone through all of the sites construction process but nowhere did I find the thickness of the shims that are needed to form the dome Im building a 42 inch oven but to create the dome I need to know the thickness of the shims to form it, any advice would be greatly appreciated

  • #2
    Re: dome construction HELP

    The thickness of your shims depends on the width of your brick, as well as the diameter. Rather than going mad with math or cad, the best way is to draw the interior ark you want on a piece of plywood, or chalk it on your base. Laying the bricks around the arch will show you exactly the width of shim you want for your particular application.
    My geodesic oven project: part 1, part 2


    • #3
      Re: dome construction HELP

      Great stuff I never thought of that way to determine the shims
      as a carpenter by trade and a halfast brick layer that never ocurred in my thinking process


      • #4
        Re: dome construction HELP

        hi there irish - by no means do i consider myself as an authority on oven building - but I am just building my own now and have reached the sixth ring so I can at least share my own experience. I got all the way up to ring six without using any shims and with only one vane as a form. I determined the angle for each brick by laying it against the vane. The mortar i used (3:1:1:1 sand/portland/lime/clay) worked extremely well to keep the brick in place and to the thickness that I set it without the need for any shims at all. As Dmun said this angle will not only depend on the thickness of your particular bricks, but will also vary according to how accurately you lay the lower bricks. As i said i have just reached the sixth ring and lost my nerve so I have now put in a sand form to continue to the top. I was VERY pleasantly surprised to find my oven still perfectly level at the top of the 6th ring, so somehow not having any shims has done the trick well enough for me!! I'll be off for a ten days holiday and then will finish off the oven later.

        Happy building!


        • #5
          Re: dome construction HELP

          Irish, I agree with John's comments, as I relied more on vanes for correct angle than support. 1 or 2 vanes sounds great in retrospect. I used shims sometimes, but more for ease than necessity. I only made 2 shims.

          If you do use shims.. Cut them long so that they stick way out and draw a line or make a notch to tell you how far to insert them. I made mine from scrap plywood cut into long thin triangles.
          - JC


          • #6
            Re: dome construction HELP

            and just to add to the shim experience - I made my oven with different shims for each ring and used no vanes or forms. As a new bricklayer, I was surprised how level the final product was. My shims were the length of a full firebrick with the width of the shim based on the gap between each of two full firebricks used to lay out the arc. This gave enough of a handle as mentioned in the previous post. I don't think the line is needed (and could even be misleading if the half bricks are not cut with precision). Just line the narrow tip of the shim up with the top of the lower brick.


            • #7
              Re: dome construction HELP

              I've been to Palmy North, beautiful place.
              Do you know a Rachael and Al Lowery? They live on a farm there on the edge of town.