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Help with insulating the base - Forno Bravo Forum: The Wood-Fired Oven Community

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Help with insulating the base

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  • Help with insulating the base

    hi everyone, can someone tell me how I insulate the base of what a round wfo will be sitting on? What order and how many inches. For instance, from the bottom up, you put cement, then what is next layer, then next , then next until you lay your firebrick oven floor. Thanks so, so much!

  • #2
    Re: Help with insulating the base

    Here ya go:

    http://www.fornobravo.com/forum/f8/p...load-1674.html
    George

    My 34" WFO build

    Weber 22-OTG / Ugly Drum Smoker / 34" WFO

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    • #3
      Re: Help with insulating the base

      In brief, the oven rests on a reinforced concrete slab, four inches or so. On top of this is your insulation, either four inches of vermiculite concrete, or two inches of refractory insulation board. If using vermiculite, a leveling mixture of sand and fireclay is put down, then the firebrick floor. Most everyone lays the firebrick flat, for two and a quarter inches.
      My geodesic oven project: part 1, part 2

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      • #4
        Re: Help with insulating the base

        Hi Dmun...Thanks for the great advice. I want to insulate well and not skimp on any conditions. Can you please tell me how you would insulate the firebrick dome in the order that it goes and how many inches of the insulation. Thanks so much!

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        • #5
          Re: Help with insulating the base

          I insulated my base with one inch of percrete on top of the structural slab, plus two inches of FB board. A full hot burn at equilibrium on my oven does not get the opposite side of the structural slab more than about 100 or so degrees--basically a hot Minnesota summer.

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          • #6
            Re: Help with insulating the base

            Hi Eric,

            Is percrete perlite and concrete? FB board is what kind of board? Thanks so much!

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            • #7
              Re: Help with insulating the base

              Is percrete perlite and concrete?
              Perlite (or vermiculite) and portland cement. The perlite is a lightweight aggregate, not a concrete additive.
              FB board is what kind of board?
              Refractory mineral fiber board. I used insblock19. There are lots of brands, and a more expensive alternative, calcium-silicate (cal-sil) board.
              My geodesic oven project: part 1, part 2

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              • #8
                Re: Help with insulating the base

                Dmun beat me to it! Best wishes on your build!

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                • #9
                  Re: Help with insulating the base

                  Thanks everyone for all of your great help! Mina

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