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angle irons on corner installation - Forno Bravo Forum: The Wood-Fired Oven Community

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angle irons on corner installation

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  • angle irons on corner installation

    Anybody have thoughts on using angle irons on a Pompeii oven corner installation? The irons are intended to give support to the last layer of cement blocks spanning the opening in the base by laying across a significant portion of the adjacent 3rd layer of blocks. With a corner installation as described in the downloadable oven plans, it seems to me that the irons would barely be hanging on by their "fingernails". This is not discussed in the plans.
    Seems like flat irons placed more internally in that portion of the base would gain more support from the previous layer of bricks and make the span across the gap stronger.
    Thanks for any advice you can provide.
    GJBingham
    GJBingham
    -----------------------------------
    Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

    -

  • #2
    Re: angle irons on corner installation

    For what it's worth, I just poured the hearth slab across the gap, and did away with the angle irons. It hasn't fallen in yet!
    -Chris-
    I'm building a Pompeii Oven in Austin, Texas. See my progress at:
    Il Forno Fumoso

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    • #3
      Re: angle irons on corner installation

      Thanks Chris,
      I considered that and that is what the pictures seem to indicate in the oven plans I downloaded. I reread some of the other text which talks about a sagging hearth, which made me want to post the question.
      GJB
      GJBingham
      -----------------------------------
      Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

      -

      Comment


      • #4
        Re: angle irons on corner installation

        I've never been able to appreciate why you'd want to sacrifice headroom of the opening by placing angle irons and a course of blocks above the third course, when you could just pour the hearth slab on top of the fourth course of blocks, using whatever method to support the slab during the pour.

        Can anyone shed some light on this - is it purely for aesthetics? Or if it's for structural reasons, perhaps I'm missing something.

        Like Chris' hearth slab, mine hasn't fallen down either!

        Paul.

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        • #5
          Re: angle irons on corner installation

          Hi Hendo,
          to me all you need to do is have your concrete sufficiently thick enough (and I would anticipate between 4 to 6 inches (100 to 150mm) with some F62 reinforcing mesh (and I would double it over the unsupported hearh front. To add that extra strength, I would also put in a couple od 12nn reinfircing deformed bars (one top and the other bottom) ata round an inch or so from the surfaces.
          This will support huge amounts of weight but remembering that the oven doesn't have much weight over that particular area of tour base. The opening and vent area taking up most of the room.
          I would however prop the unsupported area until the cement slab has cured for at least a week or so.

          Neill
          Prevention is better than cure, - do it right the first time!

          The more I learn, the more I realise how little I know


          Neill’s Pompeiii #1
          http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
          Neill’s kitchen underway
          http://www.fornobravo.com/forum/f35/...rway-4591.html

          Comment


          • #6
            Re: angle irons on corner installation

            Neill - your thoughts accord with mine.

            Perhaps someone involved in the development of the FB plans could shed some light on this?

            Sorry to hijack your thread GJB, but I guess it's relevant to your inquiry.

            Paul.

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            • #7
              Re: angle irons on corner installation

              Just noticed another example (at http://www.fornobravo.com/forum/f2/s...tand-2714.html) of a slab poured straight on top of the walls without a support lintel:



              I don't think Drake's had any problems with his hearth slab sagging either!

              And if aesthetics are an issue, you can always modify the opening with your veneer material, as Drake did. But at least you get the option of maintaining the headspace if you want.

              Cheers, Paul.

              Comment


              • #8
                Re: angle irons on corner installation

                Thanks all,
                Good comments. I guess I'll give it a shot without the irons.
                GJB
                GJBingham
                -----------------------------------
                Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

                -

                Comment


                • #9
                  Re: angle irons on corner installation

                  No problems with sagging...

                  My construction friends assured me they pour thinner slabs over longer spans all the time...

                  Drake
                  My Oven Thread:
                  http://www.fornobravo.com/forum/f8/d...-oven-633.html

                  Comment


                  • #10
                    Re: angle irons on corner installation

                    I know the answer as to why we recommend the angle iron and course of blocks. Security. When we first wrote the plans and built the first ovens, we took the safe route, which has a lot going for it.

                    I am trying the U-shaped stand and thicker slab approach in my new oven -- which you can follow here:

                    http://www.fornobravo.com/forum/7/ar...html#post17127

                    Like of lot of things related to brick ovens -- dome height, opening size, vent design, dough hydration, etc., there is wiggle room in how you do it, and there really is no one "right" away. Rather, there are multiple right ways. Well, except for dough. :-)

                    James
                    Pizza Ovens
                    Outdoor Fireplaces

                    Comment


                    • #11
                      Re: angle irons on corner installation

                      Thanks James,
                      Appreciate your input. I'm going with a loose interpretation of all plans anyway. After 5 years of living in Sicily, I've seen that even less than perfect building standards produce reasonable if not exceptional results (though a 5.0 earthquake can be quite devastating to some less than perfect buildings). While I applaud the absolutely perfect dome constructions I've seen posted by some of the builders, I understand that it is not entirely necessary to achieve perfection to have a workable product. Efficiency is important, sanity moreso.
                      I applaud your efforts in sharing these plans and broadening the world's appreciation of truely great food and contributing to a cooking experience that enriches families and friends.
                      GJB
                      GJBingham
                      -----------------------------------
                      Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

                      -

                      Comment

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