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Minne"snow"ta castable build....... I think?

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  • #46
    This will affect the performance of the oven. If you are spending the time and money to build a WFO do it correctly. It won't be "some" BTUs it could be significant. But I will let others chime in. We iterate often on the blog that the oven dome and floor need to be isolated from the concrete hearth. A possible option would be to pour a 5 to 1 p/vcrete ring around the base of the dome to insulate from the hearth.
    Russell
    Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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    • #47
      Originally posted by UtahBeehiver View Post
      This will affect the performance of the oven. If you are spending the time and money to build a WFO do it correctly. It won't be "some" BTUs it could be significant. But I will let others chime in. We iterate often on the blog that the oven dome and floor need to be isolated from the concrete hearth. A possible option would be to pour a 5 to 1 p/vcrete ring around the base of the dome to insulate from the hearth.
      Interesting. You are right, in that if i am spending all this time and money I want to do it right. A perlcrete ring wouldnt take too much effort. I just hate having to wait another 6/7mos to get back at it and start enjoying pizza. I need to see if someone has some form ideas that would allow me to construct in my house, then join together with refractory mortar.

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      • #48
        I does mean you need to take the pcrete ring all the way into the floor brick or there will be a gap between the floor and the inside of the dome. There have been a couple builds where they build the dome inside a garage for assembly later. Be aware it will be very heavy unless you segment the dome. Go search on Other Type of Builds for the projects. David S is our cast expert and he should give you some insight on doing this.
        Russell
        Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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        • #49
          Americana I sent you a message about your form material.

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          • #50
            I ended up being waylaid by a patio my wife wanted and built a mold in the basement. Casting the dome in 1/4 sections. Each mold is close to 200lbs and 3” thick, with mesh inside for reinforcement.

            Me concern is that the weight of these would crush the perlcrete ring I would place under it. Thoughts?

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            • #51
              5:1 is ok, 10: is not.
              Kindled with zeal and fired with passion.

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              • #52
                Originally posted by david s View Post
                5:1 is ok, 10: is not.
                I may go 4:1 for added strength. And the mix is straight Portland cement with perlite/vermicrete, or what else in the mix?

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                • #53
                  The more cement you add, the less insulating the casting will be. (see attached table for explanation).
                  Adding a little (a handful for every litre of cement in the mix) powdered clay helps to get the cement to cover the grains. But this is usually only required for a lean (10:1) brew. Too much water will wash the cement off the grains so adding the correct amount is vital. add water and mix gently in a barrow (not a mixer) until the water pools a little in the bottom of the barrow.Allow plenty of time for it to dry out before building over it. (See attached experiment)

                  Click image for larger version  Name:	image_83170 copy.jpg Views:	11 Size:	146.2 KB ID:	453313
                  Vermicrete insulating slab PDF.pdf
                  Attached Files
                  Last edited by david s; 05-24-2023, 04:41 AM.
                  Kindled with zeal and fired with passion.

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                  • #54
                    I’m working on my forms and plan to assemble outside in n a week or two. Regarding stove pipe and cap, anyone have good and cost effective recommendations? I’m guessing I need 7” or more in diameter and at least 36” high.

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                    • #55
                      Look at the FB Pompeii plans and recommended chimney size based on diameter is posted.
                      Russell
                      Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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                      • #56
                        UtahBeehiver Thanks. Seems my 38” is between an 8-10” ID. 10” just seems huge to me and will go with an 8”.

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                        • #57
                          Finally had the forms completed. However, with each piece weighing 180-200lbs, it was a pain bringing them upstairs.

                          once in place on the pad, I’ll be closing the joints with Sairset.

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                          • #58
                            Dry fit completed, filling the gaps with Sairset.

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