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Assembling Cal Sil insulation - 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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Assembling Cal Sil insulation

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  • Assembling Cal Sil insulation

    Hi to everyone.

    My question is do I need to bond together the Cal Sil insulating sheets under my oven floor, or just place them flush against beach other? The boards are 1000 mm x 610 mm, so there will be some seams under the floor.

    I will be pouring a 4" vermiculite hearth, plus the 2" insulating boards on top. My oven floor will consist of 12" x12" x 2" refractory tiles. My understanding is the Calsil can sit directly on the vermiculite, and the oven floor can sit directly on the Calsil.

    I have also been reading many discussions regarding more or less thermal mass in the oven floor, heat up times, loss of floor heat etc.
    With the help of some sound contributions to the forum, I have concluded:

    Because I will have both Vermiculite and Cal Sil insulation, I should not lose too much heat from the slightly thinner 2" floor, and I should also get the floor temp up quicker. Also there will be less seams, therefore less gaps for heat loss? Does this make sense??

    All the best

  • #2
    Re: Assembling Cal Sil insulation

    You are correct with that insulation you are more than fine at the bottom...I put only 2" boards on top of the heart.
    I would not worry about the joints, if you need just level the boards with some fire clay.
    Ciao Carlo

    Cost spreadsheet updated 4/22/08

    Pictures updated 5/28/08

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    • #3
      Re: Assembling Cal Sil insulation

      Thanks very much. I will post some photos soon on my progress to date - next to do is put the floor down and start building!

      All the best

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      • #4
        Re: Assembling Cal Sil insulation

        Just as a side note, yesterday I had a very hot fire in my oven, burning some scrap lumber. After dinner I noted that my landing, which is a bracket supported piece of two inch slate was very hot to the touch, as well as the arch over the opening, but the slab under the oven floor was still cool to the touch.

        This is with 2.5 inch insblock19, which is not supposed to be as good an insulator as cal-sil.
        My geodesic oven project: part 1, part 2

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