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Vermiculite Base Insulation - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

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.

Ask Me Anything New Forum Feature

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:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

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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Vermiculite Base Insulation

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  • Vermiculite Base Insulation

    I have a 4" layer of 5:1 vermiculite concrete. Is that adequate to insulate the bottom of my oven? Do I need to add some board insulation above the vermiculite? I plan on insulating the outside with four of the 1"x25' rolls of ceramic blanket. Money is tight, and I think the ceramic board is going to cost me close to $200. That would almost pay for the rest of my bricks, and the blanket insulation. I don't need to cook three days later, but I also don't want my oven cooling down after a half hour. I would hate to lift the oven off the base and add more insulation after its done. I think its going to be pretty heavy.
    So here was yesterday:


    And here is today:

  • #2
    Re: Vermiculite Base Insulation

    From what I have read many feel that 4" of 5-1 of vermicrete is enough. If you want to save money and still have more insulation without adding much more height, Two inches of Calcium Silicate would be less than half the price of what you quoted as the ceramic board sells for. It is equal in insulation factor as the 4" of V-crete which you already have.
    I hope that 3 rolls of ceramic fiber blanket is enough for my oven (44"), but then again I am planning to put 4" of V-crete over that.
    joe watson

    "A year from now, you will wish that you had started today "

    My Build
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    • #3
      Re: Vermiculite Base Insulation

      I think you will be fine with the vermicrete you already have.
      Lee B.
      DFW area, Texas, USA

      If you are thinking about building a brick oven, my advice is Here.
      Our One Meter Pompeii Oven album is here.
      An album showing our Thermal Breaks is Here.

      I try to learn from my mistakes, and from yours when you give me a heads up.

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      • #4
        Re: Vermiculite Base Insulation

        Thanks for the replies. I'm at the point of no return, and just a little bit nervous. Hopefully my floor will go in tomorrow.

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