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Newbie Hearth Question - 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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Newbie Hearth Question

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  • Newbie Hearth Question

    Hi
    Lurked for a while and thought I ought to join.
    Our oven project is coming on well. We are trying to keep costs down by using recycled products as much as possible. We are just about to lay the insulated hearth below the fire brick base.
    The question is, to keep costs down, could we use broken glass as ballast mixed in with the vermiculite/cement mix? Would that work for insulation?
    Thanks in anticipation.
    SB

  • #2
    Re: Newbie Hearth Question

    Hi SB,

    I remember seeing a video once of a guy using glass under his floor but I reckon he used it for heating purposes rather than insulation.
    Not sure how it would work but the way I think about it is this.:

    if you had a handful of glass and there was a fire on the top of it surely it wouldn't be long before you began to feel the heat, therefor that means to me that it would not be a good insulator to mix with the vermiculite.
    I have heard of whole bottles being used as an insulator in pig stys for instance under the floor.
    Your aim is to keep cost down but it is my understanding vermiculite is cheap.
    Just my thoughts SB good luck.

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    • #3
      Re: Newbie Hearth Question

      Most insulators work by trapping air, a poor conductor of heat. Bits of glass won't do it. Vermiculite, or perlite, has air pockets in it.
      Can you get scoria, or pumice? Lots of air bubbles trapped in the volcanic rock.
      Off-cuts of Aerated Autoclaved Concrete (AAC) from a building site, maybe?

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