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Hearth construction question - Forno Bravo Forum: The Wood-Fired Oven Community



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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Hearth construction question

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  • Hearth construction question

    Building a 38" pompeii. Base is built. Using one layer of high-duty bricks for insulation layer. It was suggested to me to put a piece of hardibacker down on top of the insulation bricks and then build the oven on top of the hardibacker. Please let me know your thoughts. Thanks in advance!

  • #2
    Re: Hearth construction question

    You might want to read up a little bit more before you start your build. Any type of bricks are not used for insulation (they create more thermal mass). If you don't use an insulation layer under your oven it will take forever to heat up and keep hot. Use the insulating board or make a layer with vermiculite/pearlite.
    -I don't think hardibacker board is rated to get that hot (it might fall apart).

    Good luck


    • #3
      Re: Hearth construction question

      Originally posted by davidwilcox123 View Post
      It was suggested to me to put a piece of hardibacker down on top of the insulation bricks and then build the oven on top of the hardibacker.
      I'm curious, who is this person? It defies everything we have learned, and built upon, from this site. You can download the plans from the FB store (free). And as Mike has suggested, read up a little more.
      Check out my pictures here:

      If at first you don't succeed... Skydiving isn't for you.


      • #4
        Re: Hearth construction question

        You may be confusing High-Duty Bricks for insulating firebricks. Just know that insulating firebricks (IFB) have the same r-value as vermicrete and while wonderfully uniform in construction and able to withstand compression, need to be at least 4" thick under an oven floor to be effective. IFB works ideally coupled with a layer of ceramic board.


        • #5
          Re: Hearth construction question

          Les: loved your answer. Thanks.....

          You're right. Needed some more information and an explanation. Thanks for the input. Simple step, now understood.

          Less thermal mass!