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Insulation above hearth slab - Forno Bravo Forum: The Wood-Fired Oven Community


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New Forno Bravo Forum Feature

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:
- 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.

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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Dome Installation Video - Casa / Premio / Modena


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.

Check it out on our You Tube Channel.


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.

Thanks for participating in our Forum. We will have more video content available soon.
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Insulation above hearth slab

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  • Insulation above hearth slab

    I have just completed the hearth slab and the vermiculite/cement layer with one minor problem:I was unable to fully complete the vermiculite/cement layer (instead of the five inches , I only have one inch).
    I cannot continue with the insulation because I am unable to find the vermiculite.
    Question1 : Can I use the fornobravo ceramic blanket on top of the one inch inslation layer I already have ?
    Question2 : If I understand correctly, the ceramic blanket is Alumina and silica
    which is chemically similar to bricks. Will this blanket function as an insulator or as added mass?

  • #2
    Re: Insulation above hearth slab

    Question 1: for the insulating slab the blanket is the wrong stuff. You need an insulating board, like insblock 19 or cal-sil boards. There should be no trouble getting vermiculite or perlite if that's what you want to use: check with landscaping suppliers or pool suppliers, they should have them in the big bags. If you go with the refractory boards, you can use them right on top of what you have if it's level, and if it isn't, a little layer of dry fireclay or refractory mortar mix will level it out.

    Question 2: The insulation blanket is mineral wool, as you say, mostly silica. It is an insulator because it traps air spaces. If you use it under the mass of your oven, it will squeeze all the air out and become ineffective. Keep your blanket for on top of your oven.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Insulation above hearth slab

      Dmun, as usual, is correct. Don't skimp on this step!!

      My Oven Thread:


      • #4
        Re: Insulation above hearth slab

        Sorry , I am referring to the fornobravo ceramic board, not the blanket.


        • #5
          Re: Insulation above hearth slab

          Yes, you can use the Forno Bravo board on top of the 1" vermiculite/concrete layer. That will provide even more insulation than many folks are using (you can use the 2" insulation board without any additional insulation under the oven floor).
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