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Another fine question - Forno Bravo Forum: The Wood-Fired Oven Community

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Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
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- The live thread will remain in the AMA forum to view after the session.

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Another fine question

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  • Another fine question

    I know it is recommended to pour the concrete / steel and insulating layer on the same day so they cure and bond together. What is the down side if you pour the insulating layer on a different day? I can't imagine that it would move being surrounded and loaded with brick. The reason I ask is that I am playing with the idea of having a different shaped form for the insulation layer than the supporting slab.

    TIA,

    Les...
    Check out my pictures here:
    http://www.fornobravo.com/forum/f8/les-build-4207.html

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

  • #2
    Bond. Cement bond.

    I planned on pouring my insulating layer on a different date than the hearth slab, then went with the isol board instead. I can't see any problem with pouring it seperately. I think that direction referred to when the insulating slab was underneath the reinforced slab, so the insulation would bond to the bottom side. In any case, I planned on notching the top of the reinforced slab so the perlite concrete would have something to grab onto. Isol board makes life much easier though.

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    • #3
      Excellent Question

      I have to admit that the "pour the same day" logic goes all the way back to my experience with the ill-advised hanging hearth -- where the insulation rests under a concrete thermal layer, and the whole affair hangs by heavy 5/8" rebar on a block stand. With this design, you need to fuse the top and bottom layers, as they hang together. But that basic desgin is wrong -- and I have never seen it anywhere else in the world (other than in the BreadBuilder's book).

      A much better hearth design is to place the insulating layer on top of the structural concrete support layer -- which in turn rests on top of the block stand. With that design, the insulation rests on top of the concrete support layer, and gravity takes over. The two layers do not need to fuse, and you do not need to pour the same day.

      A good example of how this works is Super Isol, which simply rests on top of the concrete support layer. Another good example is our commercial oven supplier, who fills a structurally rigid metal tray with layers of solid-state insulation. No fusing required.

      Hope this helps, and I will edit the Pompeii oven plans to reflect this change.
      James
      Pizza Ovens
      Outdoor Fireplaces

      Comment


      • #4
        Thanks

        Thanks Nick and James, one less confusing issue to deal with.

        Les...
        Check out my pictures here:
        http://www.fornobravo.com/forum/f8/les-build-4207.html

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

        Comment


        • #5
          I have removed the "pour the same day" text. Phew.
          James
          Pizza Ovens
          Outdoor Fireplaces

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