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Hearth insulation layer - 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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Hearth insulation layer

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  • Hearth insulation layer

    Hello all, working on foundation for an earth oven, up to the insulation layer for the hearth and had some questions,

    Just wanted be sure I understood the mix. Portland cement and vermiculite mixed ratio of 5 or six to one, (I assume the measure is by volume in dry state for both) nothing else added like sand or rock. Also, I read one of the threads where someone had better success by mixing the Portland cement separately into kind of slurry and adding it to the vermiculite in a separate container than mixing into kind of an oatmeal state. Oh, how about the reinforcing rods, I am pouring a 6.5 diameter circular base, seems some say rods on 12 inch centers and others on 8 inch centers. Or can the wire screen be substituted.

    Thanks for the advice!!

  • #2
    Re: Hearth insulation layer

    six to one is fine. No sand or gravel. Mixing a slurry first is simpler. When mixing the vermiculite and cement - mix gently (by hand not machine) so as not do break down the vermiculite particles and reduce insulation value.

    For rebar in the suspended slab, I suggest either 8 inch spacing for 1/5 inch diameter rebar or 6 inches for 3/8 inch rebar (the 3/8 is much easier to work with). Both ways, in a grid. Re-bar is cheap. Wire mesh (WWF) should not be substituted for rebar.

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