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Cracked Flue - Forno Bravo Forum: The Wood-Fired Oven Community



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Cracked Flue

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  • Cracked Flue

    I fired up my oven for the first time to full temperature (+700 degrees F) and the horizontal flue cracked. The horizontal flue is made out of clay flue liners, as is the chimney stack, and it cracked where a smaller horizontal piece is sandwiched in between a 2' section and the chimney stack. The horizontal pieces had one side cut off and placed so as to form an upside U to form a channel. Temperature readings on the flue during firing never exceeded 325 F. The oven went to over 725 in places. I think the biggest cause for the crack was a mortar joint a little too large caused by a not quite flush fit.
    I need to get this fixed, obviously. Should I; A, Fill crack with more mortar and continue firing. B, Repair the crack with a thick glob of castable refractory cement, C, Can I pour and encase the clay liner in a refractory cement or D, remove the horizontal pieces and create a whole new horizontal flue with castable?
    Any help, or sympathy, is greatly appreciated

  • #2
    Re: Cracked Flue

    Id encase it with refractory concrete.

    Have you got any more pics of your oven, Im interested to see the design having a horizontal flue and all?
    The English language was invented by people who couldnt spell.

    My Build.



    • #3
      Re: Cracked Flue

      Originally posted by brickie in oz View Post
      Im interested to see the design having a horizontal flue and all?
      No doubt. the gasses from the oven want to go vertical, or at least mine do
      Check out my pictures here:

      If at first you don't succeed... Skydiving isn't for you.


      • #4
        Re: Cracked Flue

        I'll post some more up. It's a lot like Doug Spaldings' design with a few tweaks because of lack of blocks in southwest US. Encasing it right now, I'll let you know how it went