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Tims oven - early days!

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  • Tims oven - early days!

    Well, I finally have concrete in the ground!

    The location of my oven had to be dug out of a bank of loose dirt, and I'm making a curved brick retaining wall around it. The first pics show where I dug the foundation trench (about 400mm) and poured a footing. You can see the location of the wall with the first course in place, and how I'm cutting the bricks to fit around the curves nicely. I thought that it would be good practice for the dome. I'm going to do the first 3-4 courses double skin for strength.

    Next I cleared some more shrubs out of the way and started to dig the foundation for the oven (bit rough with a hangover). I got a mate who is a concreter to help out, but we still found the quickest way to get the forms square was to loosely tack the boards together at the right widths with a couple of nails. Then it was just a matter of dropping them into the hole and getting the diagonals equal before getting the level right and staking the boards.

    You can just see some holes cut in the plastic; I dug a row of piers down each side of the foundation for extra stability. After putting in some mesh, we used a laser to mark off the correct height on the inside of the forms, and we were ready to pour!

    My cement mixer has now been in the family for 3 generations so it was pretty noisy. After the first load I saw why my friend had wanted to start early, you need a lot more concrete than I realised for such a small slab. We ended up using about 1 ton of pre-mix and 8-9 bags of cement.
    Last edited by Tim F; 10-29-2008, 03:45 AM.
    My oven: http://www.fornobravo.com/forum/21/t...html#post46599
    My blog: Live For Pizza

  • #2
    Re: Tims oven - early days!

    After pouring enough concrete, we screeded it, using the marks we made earlier as a guide to get it level. After a few hours it had firmed up enough to shape the corners and finish the surface. The next morning I took off the boards. Next step - laying besser blocks for the stand.
    My oven: http://www.fornobravo.com/forum/21/t...html#post46599
    My blog: Live For Pizza

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    • #3
      Re: Tims oven - early days!

      Cool. I can tell this is going to be a great thread. I look forward to watching your progress.

      dusty

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      • #4
        Re: Tims oven - early days!

        Well, I started laying out the besser blocks today and spotted my first drama. I went with slightly thinner bricks (390x190x140)to save a few dollars, but realised that they don't fit together neatly like bricks should (although you can't see this in the pic with just the first course). This leaves me with 2 options - either cut the corner blocks to the right lengths, or stack them all without offsetting each course (obviously wouldn't be as strong).

        Any thoughts on the best way to go? I think cutting would be preferable but they are just too big to fit under the disc of my chop saw. Any other ideas on cutting? If I just stack them all and fill the cores will the structure be too weak?

        At least my slab is level!

        Edit: after talking to another mate I reckon I'll just cut them with an angle grinder + diamond blade - although I'm open to any other solutions!
        Last edited by Tim F; 10-13-2008, 03:36 AM.
        My oven: http://www.fornobravo.com/forum/21/t...html#post46599
        My blog: Live For Pizza

        Comment


        • #5
          Re: Tims oven - early days!

          The angle grinder should do ok cutting. Wear a mask and eye protection, it's unbelievably dusty.

          If you look at my thread (link's below, I think it works) you can see my stand isn't standard, and two of the sides are freestanding except for the lintels on top. We put rebar into every core and filled them all, and believe me, when it set up, you'd have to really work at it to push them over. When you get your slab on top it gets even sturdier.
          Elizabeth

          http://www.fornobravo.com/forum/f8/e...html#post41545

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          • #6
            Re: Tims oven - early days!

            Good call. I picked up an angle grinder and diamond blade today (ironically it would have been cheaper to just buy the expensive bricks, but at least now I have an angle grinder) and it cuts through the blocks like butter.
            My oven: http://www.fornobravo.com/forum/21/t...html#post46599
            My blog: Live For Pizza

            Comment


            • #7
              Re: Tims oven - early days!

              You'll use the grinder a lot, particularly in the last stages of the oven. I used mine to custom-cut a lot of the bricks that attached to the arch- it was much better to use than the saw. I also used it to shape the keystones. No joke, though, use the eye gear and mask. (and hearing protection, too) I had a red-hot piece (a speck, really) fly out of a brick and smack me on the face- left a welt and burn, and heaven only knows what would have happened if it had hit my eye without the glasses!
              Elizabeth

              http://www.fornobravo.com/forum/f8/e...html#post41545

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              • #8
                Re: Tims oven - early days!

                I did my best darth vader impression in a dust mask, goggles and ear muffs today, cut my bricks, and almost got the stand finished. I just need to get a handful more bricks and some rebar tomorrow and I will be ready to start filling the cores!
                My oven: http://www.fornobravo.com/forum/21/t...html#post46599
                My blog: Live For Pizza

                Comment


                • #9
                  Re: Tims oven - early days!

                  Looking good, Darth!
                  Elizabeth

                  http://www.fornobravo.com/forum/f8/e...html#post41545

                  Comment


                  • #10
                    Re: Tims oven - early days!

                    Impressive (hhuuuhSHAAAA... hhuuuSHAAAA...*)... very impressive..., but its not an oven stand yet...


                    *this of course would be the heavy breathing.
                    "Building a Brick oven is the most fun anyone can have by themselves." (Terry Pratchett... slightly amended)

                    http://www.fornobravo.com/forum/f8/p...pics-2610.html
                    http://www.fornobravo.com/forum/f9/p...nues-2991.html

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                    • #11
                      Re: Tims oven - early days!

                      Looking good Tim.
                      Can I ask what size WFO you are aiming for?

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                      • #12
                        Re: Tims oven - early days!

                        I finished off the stand after I picked up the last few blocks I needed. Tomorrow I'm going to get some rebar and then fill the cores, and I'm hoping to get the forms set up ready to pour the next slab by Sunday!
                        My oven: http://www.fornobravo.com/forum/21/t...html#post46599
                        My blog: Live For Pizza

                        Comment


                        • #13
                          Re: Tims oven - early days!

                          Originally posted by Frances View Post
                          Impressive (hhuuuhSHAAAA... hhuuuSHAAAA...*)... very impressive..., but its not an oven stand yet...


                          *this of course would be the heavy breathing.
                          Oh, behave!!!

                          Tim
                          Looking good man! I did that for a frien of ours the other day(laid the block walls I mean)...yes Frances I will be getting to build yet another oven!
                          Best
                          Dutch
                          "Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity. " Charles Mingus
                          "Build at least two brick ovens...one to make all the mistakes on and the other to be just like you dreamed of!" Dutch

                          Comment


                          • #14
                            Re: Tims oven - early days!

                            Originally posted by glennb View Post
                            Looking good Tim.
                            Can I ask what size WFO you are aiming for?
                            I'm planning an internal diameter of 105cm, although that is subject to slight variation when I decide on my final insulation option. At the moment I'm thinking I can squeeze in the 105cm if I use 3 layers of insulating blanket with maybe a tiny layer of either verm-crete or a castable insulation plus the render.
                            My oven: http://www.fornobravo.com/forum/21/t...html#post46599
                            My blog: Live For Pizza

                            Comment


                            • #15
                              Re: Tims oven - early days!

                              I don't know how practical a "tiny layer" of vermcrete will be- I think it might be hard to get on there that way. I laid mine up in vertical layers- it's about as thick as my hand in most places. I did stick it on in a thinner layer on the front of the vent- it's about 1 1/2 inches there, but that was a hard surface, not the softer blanket, and it was still tricky to get it to stick. It wanted to separate from the brick under it.

                              Do you need to have it stuccoed? Maybe using metal studs and building an enclosure might work better for the finish? You could space the studs to miss the really narrow area on the sides of the dome. Enclosures can look really cool. I didn't do one because I was worried about how big it would look in my yard, but hey, now that I'm almost finished, it's freaking humongous anyway!

                              You can't skimp on insulation, so don't even think it. I would either rethink your size or your finish options.
                              Elizabeth

                              http://www.fornobravo.com/forum/f8/e...html#post41545

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