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3" or 5" - 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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3" or 5"

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  • 3" or 5"

    Has anybody had any issues with a full 4" thick hearth reinforced of course with rebar and fence I am using ceramic board so no insulating concrete layer Or just go with 5" to be on the safeside. Also has anybody had bad luck with the 80 lb bags of quickcreate premix for hearth?? Or is it ok to use it

  • #2
    Re: 3" or 5"

    Originally posted by GIANLUCA View Post
    Has anybody had any issues with a full 4" thick hearth reinforced of course with rebar and fence I am using ceramic board so no insulating concrete layer Or just go with 5" to be on the safeside. Also has anybody had bad luck with the 80 lb bags of quickcreate premix for hearth?? Or is it ok to use it
    STOP RIGHT NOW --- WHAT YOU ARE CONSIDERING IS DANGEROUS.

    Your hearth cannot be concrete it must be firebrick or similar. And if you are interested in not laying waste to significant forestland and taking tons of time to heat your oven the area under the entire oven should be well insulated. In addition the areas over and around the oven should also be well insulated.

    A 4 inch with rebar structural layer is sufficient, but used as an oven floor it will potentially decompose and in an explosive manner. Quikcrete is fine for the structural layer but not in direct contact with the heat of the oven.

    If you are going to use vermicrete for your insulating layer do not use quikcrete use Portland cement - no sand or gravel just pure cement powder and water with vermiculite or perlite.

    Even if it does not explode it will self distruct due to the heat in very short order.

    Download the oven plans from this site and read other posts regarding insulation. You will be glad you did.

    Chip
    Last edited by mrchipster; 05-13-2013, 05:46 PM.
    Chip

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    • #3
      Re: 3" or 5"

      I think he means a structural slab.


      Most of the ones I have done are 3.5". It only supports the weight of the oven, so a 4" reinforced slab is fine.

      Bagged mix works too....just don't buy any that have been stored outside unless they are covered well.
      Old World Stone & Garden

      Current WFO build - Dry Stone Base & Gothic Vault

      When we build, let us think that we build for ever.
      John Ruskin

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      • #4
        Re: 3" or 5"

        Chip,
        I misread it too the first time I read it. I think that he meant that he is not going to use a v/pcrete layer but is going to use "ceramic fiber board" for the insulation layer.
        GIANLUCA,
        A full four inches of concrete should be good to support your oven. I like the bag mix.
        Edit: What Stonecutter said
        Last edited by Gulf; 05-13-2013, 05:50 PM.
        joe watson

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

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        • #5
          Re: 3" or 5"

          Originally posted by Gulf View Post
          Chip,
          I misread it too the first time I read it. I think that he meant that he is not going to use a v/pcrete layer but is going to use "ceramic fiber board" for the insulation layer.
          GIANLUCA,
          A full four inches of concrete should be good to support your oven.
          Gulf, I hope that is true, but I thought I better be on the safe side, we both have read horror stories about bad designs. And his wording left me concerned. Sometimes people mean ceramic backer board ie cement board, wonder board, hardy backer..... And that would be a disaster.

          Chip
          Last edited by mrchipster; 05-13-2013, 05:54 PM.
          Chip

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          • #6
            Re: 3" or 5"

            To be clear sorry!! This is the structural slab that holds the oven not the cooking floor lol!!! I was just hoping to get advise on how thick do most use 4 or 5" I will be using ceramic fiber board as an insulated layer not vermiculite and of course the firebrick on top for the cooking floor

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