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Castable Fibers - Forno Bravo Forum: The Wood-Fired Oven Community

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Castable Fibers

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  • Castable Fibers

    I installed a Casa2G 100 about 2 months ago and am very happy with it. I've done lots of pizza and some bread and most everything has turned out great.

    Today I was inspecting the inside of the oven and notice two very thin hairline cracks in the back piece of the dome. On one of the side pieces is a tiny hole about the size of a small pebble. Could this have resulted from steaming the oven? I've read all about cracks on the outside of ovens but haven't seen anything about cracks on the inside of modular ovens. I cured it per the instructions.

    I was just wondering if this is okay or something I should be concerned about. My gut says it's probably nothing but as much money as I've put into this thing I'd hate to think there's somthing wrong with it. I last used the oven two nights ago and it seemed to work fine. I can't see the exterior of the oven since it's enclosed in a stone house.

    Thanks for any input!

    Jim

  • #2
    re: Castable Fibers

    My gut says it's probably nothing
    Hey Jim, Go with your gut,,, prob nothing,, keep an eye on it if it changes,, otherwise dont worry

    Cheers
    Mark

    Comment


    • #3
      re: Castable Fibers

      Thanks Mark.

      Comment


      • #4
        re: Castable Fibers

        Hey Jim,

        I agree. Keep an eye on it, but it won't be a problem. You can see small hairline cracks on the inside of the dome (on occasion), but relative to the thickness of the dome those thin lines are really OK -- they definitely do not go through to the outer edge of the dome.

        Keep cooking and keep enjoying your oven!

        James
        Pizza Ovens
        Outdoor Fireplaces

        Comment


        • #5
          re: Castable Fibers

          Thanks, James. That's reassuring.

          Jim

          Comment


          • #6
            re: Castable Fibers

            I built a WFO using a modular kit last Autumn. I recently noticed cracking EVERYWHERE as well as the surface of the dome spalling off in certain areas. Some of the cracks seemed to be right the way through.

            I got in touch with the company that sold it to me and sent them photos. Initially they suggested that it was just minor cracking - I told them I expected such cracks but this was much, much worse. I was able to prove it was correctly installed and "seasoned" with small fires first. They looked into it and it seems that a new employee may have omitted to use the fibre they normally mix into the cement.

            They are replacing the modular oven FOC and paying to take the tile roof off the housing and reinstall and reinstate.

            BTW - I've still been using it. I think a WFO would have to be falling apart before it was unusable!!
            Last edited by blackjack; 03-11-2010, 06:17 AM.

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            • #7
              re: Castable Fibers

              Thanks so much for your reply. My oven hasn't suffered any severe cracks so far but I'll keep an eye on it.

              Comment


              • #8
                re: Castable Fibers

                They looked into it and it seems that a new employee may have omitted to use the fibre they normally mix into the cement.
                Refractory concrete is an extremely difficult substance to work with. But fibers? I thought that stainless steel needles were standard reinforcement for this stuff. Hmmm.
                My geodesic oven project: part 1, part 2

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                • #9
                  re: Castable Fibers

                  I would note that that was not a Forno Bravo oven. :-)

                  James
                  Pizza Ovens
                  Outdoor Fireplaces

                  Comment


                  • #10
                    re: Castable Fibers

                    Originally posted by dmun View Post
                    Refractory concrete is an extremely difficult substance to work with. But fibers? I thought that stainless steel needles were standard reinforcement for this stuff. Hmmm.
                    Different countries do things in different ways. I know that some US building practices would not be allowed over here and vice versa.

                    I'm also pretty sure that the use of stainless steel needles is a fairly new practice and not essential for a safe and effective WFO.

                    The cob bread oven in my friends farm is nearly 500 years old and still usable. No S/S needles used in that construction.

                    Comment


                    • #11
                      re: Castable Fibers

                      The stainless steel fibers are called melt extract fibers, even though they're steel. Other fibers used are added to the mix and are designed to burn away at about 160C leaving tiny holes where steam can escape. Maybe these are what was omitted.
                      Kindled with zeal and fired with passion.

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                      • #12
                        re: Castable Fibers

                        The stainless steel fibers are called melt extract fibers, even though they're steel. Other fibers used are added to the mix and are designed to burn away at about 160C leaving tiny holes where steam can escape. Maybe these are what was omitted.
                        Huh. Live and learn. Thanks for the info. It makes sense to use a metal fiber in refractory concrete: I'm told the needles are sharp, and have a tendency to poke holes in things like hands and gloves.
                        My geodesic oven project: part 1, part 2

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                        • #13
                          re: Castable Fibers

                          Yes they are sharp, but you learn to handle the mix carefully and it's not too bad. The worst is the cost of the things, because you need a fair amount.
                          Kindled with zeal and fired with passion.

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                          • #14
                            Re: Castable Fibers

                            $10/kg is about normal rate.

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