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silver foil - insulation layer - Forno Bravo Forum: The Wood-Fired Oven Community

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Forno Bravo Forum Community,

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.
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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.

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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silver foil - insulation layer

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  • silver foil - insulation layer

    hi all

    About to start the insulation on my dome....after a few running repairs this morning

    Is it best to put silver foil on before the blanket and then the vermiculite outer layer

    or

    blanket - silver foil - vermiculite..

    or

    silver foil - blanket - silver foil - vermiculite...

    also the vermiculite outer mix is 5 -1 cement is it ok to add a little sand to the mix

    cheers

  • #2
    Re: silver foil - insulation layer

    With silver this morning at $13.75 an ounce, I'd skip the silver foil. In fact, I'd skip any foil whatever. The most common, aluminum, will be corroded instantly by the portland cement. It really doesn't have any function.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: silver foil - insulation layer

      Originally posted by ross View Post
      hi all

      also the vermiculite outer mix is 5 -1 cement is it ok to add a little sand to the mix

      cheers
      Hey Ross,


      The foil really doesn't add any value to the system with the blanket insulation. And the Portland does corrode the foil in short order.

      And the sand in the vermiculite mix will not add any value.. the idea is to get as much 'insulation' as possible, and that comes from the vermiculite. You use the Portland (cement) to hold the vermiculite together. The less Portland you use the better the insulation value; there is one guy in this forum who was getting as much as a 12:1 mix. As some point you need the Portland to provide the strength to keep the whole thing together and you can't go wrong with the 5:1 mix.

      JED

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      • #4
        Re: silver foil - insulation layer

        Don't add sand the the vermiculite cement mix. The idea is to just coat the vermiculite with cement as loose as you can. The mix creates tiny pockets of air- those pockets insulate (think of a double pane window, thin layer of air in between the glass). If you add sand you fill in the air pockets and lose insulation.
        Check out my oven progress here: http://www.fornobravo.com/forum/phot...dex.php?u=4147

        See ALL of my pictures here:
        http://picasaweb.google.com/Brevenc/...OutdoorKitchen

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