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Hearth Slab Flashing - Forno Bravo Forum: The Wood-Fired Oven Community

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New Forno Bravo Forum Feature

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.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- 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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Hearth Slab Flashing

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  • Hearth Slab Flashing

    A question about the hearth flashing. The directions call for aluminum flashing. My experience with construction is that aluminum is generally not used with concrete pours because the chemicals in concrete eat up the aluminum. My thinking is that since all we are trying to do is to isolate the hearth from the stand that maybe a sacrificial barrier may be just fine. On the other hand if the idea is to give an actual slip plane maybe we should use a stainless steel flashing (which would be a lot more expensive) or galvanized steel. Either of these would probably hold up a lot better than aluminum. Any insights?
    Mike
    "The road of excess leads to the Palace of Wisdom."

  • #2
    flashing

    it's been debated whether the flashing does any good or not. Why not just use tarpaper? It's cheap, chemically stable, and available from any roofing supply.
    My geodesic oven project: part 1, part 2

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    • #3
      I don't think the flashing is necessary. The idea was that it would serve as a slip plane between thermal layers moving at different rates, but what you see is that the interfaces between structural concrete and the concrete block and between the structural concrete and the vermiculite concrete don't get hot -- so the slip plane isn't necessary.

      We do not include that step in the Forno Bravo oven installation guides.

      James
      Pizza Ovens
      Outdoor Fireplaces

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      • #4
        Hearth

        Thanks James. I wonder if I should have left the rebar in the concrete block cells long enough to tie into the bottom of the hearth. In any case I will need to deal with the cells that I didn't dowel into the slab and fill with concrete. They would hold 12-15 60# bags of concrete. Maybe the flashing would be an answer to this or possibly the roofing paper that dmun mentioned.
        Mike
        "The road of excess leads to the Palace of Wisdom."

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        • #5
          I think these are two separate functions. Tieing the hearth and the stand together with rebar through both components is a nice idea, particularly in earthquake prone areas. That said, I live in California and did not do that on my ovens here. Still, if you can do it easily, it would add structural integrity.

          The flashing between layers is the "thermal" slip plane (originally included to allow for smooth thermal expansion and contraction), not a structural component.

          For the stand, my thought it to keep it simple (and well insulated).

          James
          Pizza Ovens
          Outdoor Fireplaces

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          • #6
            James,

            I agree completely. My only (minor) problem is to deal with the cells that I didn't fill when I was doing the "every other one" business and filling them with concrete. Those empty cells are going to eat a few bags of concrete unless I find a way to plug them.

            I read a few months back that you would sell a vent for one of the Casa ovens. Is that offer still good?
            Mike
            "The road of excess leads to the Palace of Wisdom."

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            • #7
              You can crumble up the concrete bags and stuff them into the open stand cores, and they will block the concrete for pouring in. It works.

              Yes, we are going to add the Casa vent to our online store to make it easier to assemble the vent area -- it sure beats spending hours cutting bricks, plus the opening is already round and fits the DuraTech anchor plate and chimney pieces.

              If you need it soon, drop me an email (james@fornobravo.com).

              James
              Pizza Ovens
              Outdoor Fireplaces

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