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Double Firebrick ?? - Forno Bravo Forum: The Wood-Fired Oven Community


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Double Firebrick ??

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  • Double Firebrick ??

    Hello All,
    Would it be usefull to put a double firebrick hearth under the dome, OR would that take away to much heat from the oven and not act as an insulator like the vermiculite does. ???


  • #2
    Re: Double Firebrick ??

    Firebrick is not an insulator. If pizza is your goal, one layer of flat firebrick is what you want, with insulation underneath.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Double Firebrick ??

      Fire brick will add mass to the oven and create a heat sink, This is good for breads and baking but takes longer to reach pizza temps. I doubled the floor and added an extra layer of fire mortar over the dome to create this very effect. I can't say that it take longer (but it must)to heat because I have nothing to compare it to but....it work great. The real key I believe is to insulate heavily. Insulation is more important than mass. I like doing long slow roasting say ribs or roasts.


      • #4
        Re: Double Firebrick ??

        For the record, I have a single layer of firebrick on the floor and a little extra refractory mass (1") in the dome. I can bake 25lbs of bread in one firing (or more, but I have never had more to bake). My temps are still 300 degrees the next day. So unless you are a commercial baker, the regular plans will work for you. Insulate everywhere!
        My Oven Thread:


        • #5
          Re: Double Firebrick ??

          It is a trade off between fast heating and sustaining the heat.

          As noted by DrakeRemoray, the typical one layer design will also work well with bread baking.