web analytics
need a calculation formula - Forno Bravo Forum: The Wood-Fired Oven Community



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

need a calculation formula

  • Filter
  • Time
  • Show
Clear All
new posts

  • need a calculation formula

    I haven't taken the time to read through all of the threads on this site, so I hope I'm not rehashing someone else's comments.
    I am planning to build a Pompeii oven in the Philippines. Currently I am here is the States, so it is difficult for me to plan everything. I'm looking to build a 42" dome, about 18" to 20" high. What I am looking for is some sort of mathematical formula to calculate, first: the circumference of the base layer (this is easy. Pi x D) then: the circumferences of each ascending layer based on a brick height of 2.5". Has anyone ever heard of a formula or even used one? If I were more mathematically inclined, I would try it. My reason is so that I can calculate the amount of material needed before I travel over there. I don't plan to have it built until sometime next year, so I won't be doing a lot of the actual work myself. I want to have everything ready for the contractors and laborers (wife's relatives) prior to the event. Any assistance or pointing in the right direction would be a great help.

  • #2
    Re: need a calculation formula

    You might be want to purchase an oven kit and have it shipped, the cost might be the same? This way you can build the oven yourself. I also found an interesting site the other day in Germany Franks construction manual for a wood-burning pizza oven that might help you in finding other materials you can get local. Good Luck wiyh your project, Keep in Touch


    • #3
      Re: need a calculation formula

      bimfi, Being less of a math person I would think the easiest way to figure out how many bricks would be to physically draw a half section thru the center of the proposed dome in full size (since what you are wanting is a reasonable size).

      You will be canting each successive layer (tilting each brick) so draw out the quarter section of your elipse, and then with dividers strike off 2 1/2" cords (portions of the arch) to get your new radius for each layer. Once drawn it wouldn't be that many calculations.

      Of course, the entrance will subtract bricks from several layers. And then too you will have to compute the bricks required for the entrance and transition to the chimney. And add the bricks required for the hearth. And probably including some safety factor for broken bricks and cutting mistakes since getting replacement bricks might perhaps be difficult.

      Hope this helps,


      • #4
        Re: need a calculation formula

        Is it necessary to make angle cuts for the dome?
        Can the dome be built by using standard rectangular bricks?
        Which is the better approach?


        • #5
          Re: need a calculation formula


          You can take standard firebricks, cut them in half and build the dome from those. We have many ovens here that have been done that way.

          It is definitely not necessary to make angle cuts.
          Ken H. - Kentucky
          42" Pompeii

          Pompeii Oven Construction Video Updated!

          Oven Thread ... Enclosure Thread
          Cost Spreadsheet ... Picasa Web Album


          • #6
            Re: need a calculation formula

            How about calculating the area of your hemisphere and divide it by the area that will be covered by a brick = no. of bricks required.
            Kindled with zeal and fired with passion.


            • #7
              Re: need a calculation formula

              Hi, I found this thing online - maybe it can help.

              Brick Construction Calculator

              Surely someone around here is actually done this before. I never have, and I'm not planning to build with brick anyway, but I would think that you would need to take in account the reducing diameter of each course. I'd probably figure it as each course being an individual circle - but the only time I passed calculus was when I was too sick to know what I was doing so you might not want to go by me...
              "He is no fool who gives what he cannot keep to gain what he cannot lose." - Jim Elliot

              "Success isn't permanent and failure isn't fatal." -Mike Ditka