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Keystone Size - Forno Bravo Forum: The Wood-Fired Oven Community

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Keystone Size

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  • Keystone Size

    Is it ok to have a final keystone that is about 1/2" at the base and 3/4" at the top. Do you need mortar for a keystone of that size?
    Link to my oven build on YouTube:

    http://www.youtube.com/watch?v=Ujb7lqVcSzQ

  • #2
    Re: Keystone Size

    Originally posted by K79 View Post
    Is it ok to have a final keystone that is about 1/2" at the base and 3/4" at the top. Do you need mortar for a keystone of that size?
    It will crack, adjust you arch to work bricks either with slightly larger joints or a flatter arch.
    You should work it out prior to laying the arch.
    The English language was invented by people who couldnt spell.

    My Build.

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    • #3
      Re: Keystone Size

      What should be the minimum area of the small side of my keystone? Any pointers as to what I should do? What would the ideal keystone be?
      Link to my oven build on YouTube:

      http://www.youtube.com/watch?v=Ujb7lqVcSzQ

      Comment


      • #4
        Re: Keystone Size

        I have a design now where my keysotone will be as round as I can make it. The top of my keystone would have a radius of 2.5" and the bottom 2.18". Do these dimensions look sound?
        Link to my oven build on YouTube:

        http://www.youtube.com/watch?v=Ujb7lqVcSzQ

        Comment


        • #5
          Re: Keystone Size

          Originally posted by Karangi Dude
          Sounds fine to me, you won't really know until you get there.
          The only thing I would say is make sure it is not to tight a fit you wan't it to be a snug fit.
          I think they are talking about the front arch, not the top of dame.
          The English language was invented by people who couldnt spell.

          My Build.

          Books.

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          • #6
            Re: Keystone Size

            Ok my bad, I saw a graphic of an arch with a whopping great gap at the top so I assumed it was for the arch.
            Here.
            http://www.fornobravo.com/forum/f8/m...tml#post146703
            Last edited by brickie in oz; 03-07-2013, 11:40 PM.
            The English language was invented by people who couldnt spell.

            My Build.

            Books.

            Comment


            • #7
              Re: Keystone Size

              I was using my bestest Inspector Clouseau accent.......
              The English language was invented by people who couldnt spell.

              My Build.

              Books.

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              • #8
                Re: Keystone Size

                Ok, my keystone changed (on my plans) due to the change in brick dimensions. Does this look ok overall? My firebrick is 9x4 7/16x2 5/16.

                Last edited by K79; 03-12-2013, 07:45 AM.
                Link to my oven build on YouTube:

                http://www.youtube.com/watch?v=Ujb7lqVcSzQ

                Comment


                • #9
                  Re: Keystone Size

                  As an aspiration, that looks great. But just be prepared to make adjustments along the way! Your oven is not going to come out precisely as you draw it. My keystone turned out pretty small (relative to many), but I really only started to plan it when I got to the last three courses.

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                  My $0.02 is that you might want to plan for the plug to be a little bigger than what you have now, because your mortar joints are more likely to be too big than too small, eating up any wiggle room you have.
                  My build progress
                  My WFO Journal on Facebook
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                  • #10
                    Re: Keystone Size

                    If your keystone is multiple pieces should you put them together dry and slide them in place with no mortar? Same goes for one piece if you can. Should you slide that in without mortar too?
                    Link to my oven build on YouTube:

                    http://www.youtube.com/watch?v=Ujb7lqVcSzQ

                    Comment


                    • #11
                      Re: Keystone Size

                      No harm in using mortar to seal it up and lock everything in place. The rest of the construction uses mortar, no reason to stop on the last piece.

                      Comment


                      • #12
                        Re: Keystone Size

                        Yeah, you want to use mortar on the keystone just like the rest of the dome. That's what holds the bricks apart to give your dome structural integrity. Plus, it keeps the smoke and heat inside, which is kinda nice
                        My build progress
                        My WFO Journal on Facebook
                        My dome spreadsheet calculator

                        Comment


                        • #13
                          Re: Keystone Size

                          Ok guys running into sort of a dilema designing my vent. Since my oven is 40" dia. I need an 8" dia. steel chimney. Well I'ld like to make mine out of clay flue liner which is 8"x 12". I was told that the 8"x12" has the same draw as an 8" dia. steel chimney. Others I believe have taken the 8x12's and cut them to be 8x8??? Is that enough size for correct draw?
                          Link to my oven build on YouTube:

                          http://www.youtube.com/watch?v=Ujb7lqVcSzQ

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                          • #14
                            Re: Keystone Size

                            Square/rectangular flues are measured o.d., while round ones are measured i.d., FYI.

                            8x8 is a common size for clay flue liners, with 30.58 SqIn of draw: 6.25 (i.d.)/2 gives a radius of 3.12, 3.1416x(3.12x3.12)=30.58. When calculating draw you draw the largest circle(s) that will fit in the area and use that dimension. The area of the flue should be around 15% of the size of the inner opening, and more is better up to a limit.

                            (the floor size doesn't really matter for draw)

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                            • #15
                              Re: Keystone Size

                              Originally posted by Tscarborough View Post
                              Square/rectangular flues are measured o.d., while round ones are measured i.d., FYI.

                              8x8 is a common size for clay flue liners, with 30.58 SqIn of draw: 6.25 (i.d.)/2 gives a radius of 3.12, 3.1416x(3.12x3.12)=30.58. When calculating draw you draw the largest circle(s) that will fit in the area and use that dimension. The area of the flue should be around 15% of the size of the inner opening, and more is better up to a limit.

                              (the floor size doesn't really matter for draw)
                              Ok, so an 8x8 clay flue liner will work. So I need to reach at least 30.58 SqIn for my vent opening as well? A little confusing when most try and reach somewhere between 40 and 50 sq in.
                              Link to my oven build on YouTube:

                              http://www.youtube.com/watch?v=Ujb7lqVcSzQ

                              Comment

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