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Dome concrete mix / fire brick thickness - Forno Bravo Forum: The Wood-Fired Oven Community

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Dome Installation Video - Casa / Premio / Modena

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For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

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https://www.youtube.com/watch?v=-7q7...jSniYogfUra06Q

If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

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Dome concrete mix / fire brick thickness

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  • Dome concrete mix / fire brick thickness

    I propose to build a pizza oven constructed using Perlite concrete for the dome and fire bricks for the oven floor. Two points of interest:
    (1) I have read online various mix ratios of Portland cement and Perlite and mention of including fire clay and lime into the mix. Any advice for the inclusion of fire clay and lime? Also should I use ordinary Portland or high temperature fire cement?
    (2) For the oven floor is it better to use thicker 64mm or thinner 32mm fire bricks? As I see it the thinner will heat up quicker but the thicker will absorb and give out more heat longer.
    Thanks.

  • #2
    Typically, Pcrete vor Vcrete are insulating layers over a dome of dense refractory concrete or firebrick. I suggest you do a search on the forum for cast ovens or look at postings by David S.
    Russell
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    • #3
      The I have heard of some folk using perlite or vermiculite in the mix for the inner layer and reporting that it works. I would not recommend it though because it makes the resulting casting much weaker leaving it subject to abrasion damage. In addition because it is an insulator it will make the casting resistant to heat (lower thermal conductivity),making it difficult to heat as well as having a lower thermal mass meaning it won't store much heat.
      Regarding the floor, you need around 2" of floor thickness to store sufficient heat in the floor so use the thicker floor bricks, 34 mm not enough.
      Do not use lime in conjunction with calcium aluminate cement as it acts as an accelerant and you'll find the brew goes of before you can place it. The best would be a dense proprietary castable refractory from a refractory supplier. You can use the homebrew, it works, but it's not as good although much cheaper.
      Last edited by david s; 05-07-2017, 02:20 PM.
      Kindled with zeal and fired with passion.

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