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Perlite for enclosure - Forno Bravo Forum: The Wood-Fired Oven Community

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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:
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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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Perlite for enclosure

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  • Perlite for enclosure

    I am building the 42" dome oven as per FB plans. I want to have an enclosure that is arched at the top and straight sides. I am considering forming the shape of the enclosure, adding some pencil rod for strength, and filling it with a perlite/concrete mix. After stripping the forms, I plan to finish out the enclosure with Faux brick. The dome would be covered with a minimum of 4" of perlite/concrete mix, but in areas it would be 6-8" thick. Can you have too much perlite/concrete insulation? Could it expand too much when heated and cause problems with the Faux brick finish? Any thoughts, ideas for warnings would be appreciated.
    Rbhumbert

  • #2
    Re: Perlite for enclosure

    I don't think you can have to much insulation, but you will be getting some diminishing returns for your efforts. On my build I have a 39" dome with 3-4" of cf insulation, brick walls, and a "hip" roof. I started putting a vermi-crete mixture over the insulation in 1-2" lifts and each lift kept getting stronger with portland and continuing to shape the "hip". When it got where I wanted, about 10," I poured a all concrete top over it in the "hip" shape,overlapping the sidewalls and forming a soffit. I might suggest that if you are going to add "fake" bricks to the sides, why dont you use a cement board to build your walls with..might be easier, you can still go over the top with whatever shape you want,and use the cement board as a guide for your roof. Heres a in the process picture before I put the final concrete top on it. All that vermi-crete takes a while to dry and might be hard to stick fake bricks to. I need more pic's but, wife has camera and is visiting family.... as a after thought, all I am saying is use the cement board for your forms, and then leave it up and put your bricks on it....with some interior framing of course....
    Last edited by thickstrings; 08-14-2013, 03:47 PM. Reason: more info
    " Life is art, live a masterpiece"

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    • #3
      Re: Perlite for enclosure

      Thank you for your thoughts. Your picture shows almost exactly what I have in mind, but I was considering Faux brick because of the wider selection of colors. My wife has this thing about red brick and the other colors available in real brick. Maybe I can find a real brick she likes , set the enclosure, then fill with perlite/cement mix.
      Rbhumbert

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      • #4
        Re: Perlite for enclosure

        As a side note, I filled the wall sides with dry vermiculite.....the mixed stuff is only on the top....The more portland that you use , the less insulative it will be....the dome is also sitting on 2" of cf board...no need for forms if you build a brick wall around it all....just leave room for the insulation...I would suggest using the cf blanket and board though...and then, the vermiculite,perlite.....
        " Life is art, live a masterpiece"

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