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hearth insulation questions - 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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hearth insulation questions

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  • hearth insulation questions

    I have a 4" hearth slab and need to choise an insulation material

    will the vermiculite and concrete mix hold the weight of a pizza oven for all years that the oven will last, wont the cement fall apart from all the heat

    What about using a castable insulating concrete like castilite 22 or delta crete 25 under the oven floor

    can i insulate under just the floor and not under the first chain of bricks so that the weight of the oven is on the concrete and just the floor sits on the insulation

  • #2
    Re: hearth insulation questions

    The vermiculite concrete doesn't have any tensile strength to speak of, but it doesn't need it. It has more than enough compressive strength to hold the weight of the oven. As far as heat is concerned, it's partly dissipated on the far side of the brick from the fire.

    Most insulating castables are MUCH more expensive than the vermiculite/perlite mix. If you want to spend more money, and have better/thinner insulation go for the cal-sil or mineral wool boards.

    The insulation should completely envelope your oven. There's no need to build your soldier course on an uninsulated surface, it will just be a heat leak to slow your oven from getting up / keeping up to temperature.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: hearth insulation questions

      I am also in NJ, I used a foot thick perlite mixture around oven and lean cement under hearth. I wish I would have used the insulating board offered here at forno. However the next day I am still at a solid 400 degrees great for cooking and roasting, so its holding the heat nicely
      John

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