web analytics
The Backofen - Forno Bravo Forum: The Wood-Fired Oven Community

Announcement

Collapse

Forum Issues Update

We are continuing to work diligently to resolve the issues currently being experienced with the PhotoPlog. Thank you for your patience!
See more
See less

The Backofen

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • The Backofen

    Ok ..So I will start a thread for my new oven.. I was posting in getting started
    forum.. don't think that was the right place.

    So ..I don't have a lot of room to play with in the back yard and I wanted the oven to be smaller, so I read over the plans and sorta customized the plans for what I have room for.

    I went to Denver today and picked up the Fire bricks and Heatstop 50 at Threewit Cooper Supply. The Bricks were $1.82 a piece.

    I laid the FB board down on my hearth and started to lay the bricks out in the herringbone pattern.. I have to say that it was a sense of small accomplishment that I am this far!

    I measured in from the edge of the brick 4.5 " to leave room for the brick and
    ended up with a 28" circumference usable floor.
    Next up is the Sailor course to start the dome..!
    I know it is small ,but that is what I have room for.


    Any suggestions?

    Thanks,
    Trellis
    “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


    Trellis

    Home Sweet Home~ Colorado Springs ~

    sigpic

  • #2
    Re: The Backofen

    You have space for insulation, right? What do you have in mind for a covering?
    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.

    Comment


    • #3
      Re: The Backofen

      Hi Les.. I do have space for insulation.. I have the FB Board underneath, and I have a 50 ft roll of ceramic blanket.Is that what you are talking about? Still not sure if I am going to enclose the dome or not.



      Trellis
      “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


      Trellis

      Home Sweet Home~ Colorado Springs ~

      sigpic

      Comment


      • #4
        Re: The Backofen

        What did you decide on the interior height?
        My build progress
        My WFO Journal on Facebook
        My dome spreadsheet calculator

        Comment


        • #5
          Re: The Backofen

          I spent some time with a friend today who is very capable with his auto cad and we came up with 15"..... I think that is around the 65 % of the door height of 8.75" ..does that sound right?


          Trellis

          “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


          Trellis

          Home Sweet Home~ Colorado Springs ~

          sigpic

          Comment


          • #6
            Re: The Backofen

            Originally posted by Coloradoredusa View Post
            I spent some time with a friend today who is very capable with his auto cad and we came up with 15"..... I think that is around the 65 % of the door height of 8.75" ..does that sound right?


            Trellis

            Yeah, with a 28"circumference - and a 5/8 piece of plywood under your IT - that is a pretty even radius.

            8.75" might be a little low for the arch height? 15" x 63% = 9.5". I would cheat to the high end on such a small oven and go somewhere from 9.5-10", just to have more headroom to get bigger items in and out. My $0.02, FWIW.
            My build progress
            My WFO Journal on Facebook
            My dome spreadsheet calculator

            Comment


            • #7
              Re: The Backofen

              Wow.. I was thinking the same thing .. I told my friend that it seemed a little low..I think I will go a little higher, like what you said..I will post pics hopefully today.. it was just about dusk last night when i got finished.


              Trellis
              “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


              Trellis

              Home Sweet Home~ Colorado Springs ~

              sigpic

              Comment


              • #8
                Re: The Backofen

                Don't depart too much from the 63% ratio. Your oven may sufferr from a loss of efficiency.

                Measure the height of the oven opening on your indoor range from the bottom rack to the top opening. I think you will be surprised.

                Comment


                • #9
                  Re: The Backofen

                  Where are your pictures Trellis?
                  Lee B.
                  DFW area, Texas, USA

                  If you are thinking about building a brick oven, my advice is Here.
                  Our One Meter Pompeii Oven album is here.
                  An album showing our Thermal Breaks is Here.

                  I try to learn from my mistakes, and from yours when you give me a heads up.

                  Comment


                  • #10
                    Re: The Backofen

                    I set the floor. From what I have read you don't lay the bricks on anything .. just the insulation? I cut my first bricks today..I need to go buy another blade for the borrowed saw..will do that tomorrow A.M. The plans also say there are 3 ways you can set the first course.it also says that you dont have to cut anything on that course..correct? I am going with the sailor course..

                    I am open to all help.. comments etc.. from all of my fellow builders.. looking at all of your builds helps me... also with your experience..I will say thank you in advance!

                    Two pics of the floor and the 1st brick I cut!
                    Attached Files
                    “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


                    Trellis

                    Home Sweet Home~ Colorado Springs ~

                    sigpic

                    Comment


                    • #11
                      Re: The Backofen

                      You should set the bricks on a 50/50 mix of damp sand and fireclay, applied with a tiling trowel so you get those furrows. That will allow you to get the bricks nice and level.

                      I think you said you're using Heatstop or some similar (read expensive) mortar? If so, you might want to cut those sailor bricks with a ~5 degree angle on each side so they fit together more closely. You will use a lot less mortar.
                      My build progress
                      My WFO Journal on Facebook
                      My dome spreadsheet calculator

                      Comment


                      • #12
                        Re: The Backofen

                        ok..Yah I bought heatstop 50.. 5 degree angle..ok.. I thought that was a big mortar joint when I put them next to each other!


                        Trellis

                        “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”



                        Home Sweet Home ~ Colorado Springs!
                        Attached Files
                        “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


                        Trellis

                        Home Sweet Home~ Colorado Springs ~

                        sigpic

                        Comment


                        • #13
                          Re: The Backofen

                          Actually, now that I think about it a little - I used 5 degrees in my 39" oven - which I think was about a 1/2 inch drop per side.

                          But your oven is quite a bit smaller, so I think you need a sharper angle. figure out how many full width bricks you need to go around the outside perimeter, then divide the inside perimeter by the same number of bricks and you have your drop

                          Outside perimeter= (28 + 9) * pi = 116.2 inches, so you need 25.8 half bricks

                          Inside perimeter= (28") * pi = 88 inches / 25.8 bricks = 3.4 inch interior face

                          So if my math is right, you want to cut an angle that takes roughly 0.55 inches ((4.5" - 3.4")/2) off of each side. That's a 7 degree angle.
                          My build progress
                          My WFO Journal on Facebook
                          My dome spreadsheet calculator

                          Comment


                          • #14
                            Re: The Backofen

                            Trellis, if you make a Hendo tool and put it in place, then lay a brick on the perimeter, the tool (or straight edge from your center point to the outside corner of the brick) will give you the angle you want with no computation at all. That works for every ring. I would query David s about his 21 inch oven and ask specifically what he recommends about brick size.

                            BTW, in retrospect for us, there is more fun in using the oven than building it. I would not taper my bricks again. It was a lot of effort with little return. Also, I would not attempt a tiny mortar seam on the inside of the oven (that makes it impossible to completely chink the openings between the bricks with mortar. At least one forth inch of mortar between bricks has worked fine in many a good build. Those are a couple of my observations in hindsight, I hope they are useful to you.
                            Last edited by Lburou; 05-02-2012, 05:36 AM.
                            Lee B.
                            DFW area, Texas, USA

                            If you are thinking about building a brick oven, my advice is Here.
                            Our One Meter Pompeii Oven album is here.
                            An album showing our Thermal Breaks is Here.

                            I try to learn from my mistakes, and from yours when you give me a heads up.

                            Comment


                            • #15
                              Re: The Backofen

                              Thanks guys .. I am on my way to HD to get the materials for the IT and a new saw blade. will post progress this evening .. thanks again!
                              “Never regret. If it's good, it's wonderful. If it's bad, it's experience.”


                              Trellis

                              Home Sweet Home~ Colorado Springs ~

                              sigpic

                              Comment

                              Working...
                              X