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Forming dome (Refractory) - Forno Bravo Forum: The Wood-Fired Oven Community

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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:
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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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Forming dome (Refractory)

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  • Forming dome (Refractory)

    I have now formed the dome of my oven using sand but I'd like to finish it in Plaster, What can I use to seal and hold the sand in place? I was thinking of paper mache? What other materials can I use?

  • #2
    Re: Forming dome (Refractory)

    I used strips of wet newspaper over the sand, then cast onto that. It gives you a pretty good surface on the inside of the casting and any newspaper left behind will burn away. I think you'll have a hard time breaking a plaster crust away from the inside of tHe dome no matter how much release agent you use.
    Kindled with zeal and fired with passion.

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    • #3
      Re: Forming dome (Refractory)

      Striking the dome will not be a problem as is will be segmented into 5 equal pieces and one large piece. I have mold release agent which we use at work but I see the peri and doka type formwork pans have a (Greasy) wax coating on them which seems to last at least 2 pours So I was thinking of using the wax and release agent. The door arch will be difficult to strike from the form I know but hey, that's what I do for a living, Just hope I don't destroy the form whilst removing the concrete.

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      • #4
        Re: Forming dome (Refractory)

        "Just hope I don't destroy the form whilst removing the concrete." Sounds like you want to reuse your mould, in which case a plaster crust is highly unlikely to survive. Make a fibreglass mould if you want to do more than one dome.
        Kindled with zeal and fired with passion.

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