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expansion joint? - Forno Bravo Forum: The Wood-Fired Oven Community


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expansion joint?

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  • expansion joint?


    I've seen some examples (can't remember where!) of a gap between the inner dome and the cosmetic brick work. It sounds logical to have one I suppose.

    Has anyone used one? what did you plug the gap with?

    Any hints-tips will be appreciated


  • #2
    Re: expansion joint?

    I think I understand your question.
    Insulation goes on the outside of your oven bricks, then the cosmetic brick work. Lots of insulation. Then you can have a gap or not. I don't think it matters. The builders who used stucco to finish the top of the oven used no gap.
    Hope this helps.



    • #3
      Re: expansion joint?

      Thanks for the reply ... maybe I should have explained my query better

      I mean where the hearth and the chimney work meets the outer/cosmetic brickwork



      • #4
        Re: expansion joint?


        I didn't use one, but when you mortar the brick, you almost get one by default. The mortar isn't going to be solid between the two bricks. I did separate the brick from the flue about two inches and filled the gap with vermiculite/portland for insulation.

        Check out my pictures here:

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


        • #5
          Re: expansion joint?

          I just put a piece of foil to create a slip joint there. You could use the flat stove door gasket material if you wanted to get fancy. There's also a quarter inch version of the insulating blanket, but I'm sure you'd have to buy the whole roll.
          My geodesic oven project: part 1, part 2