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Using Aluminum Foil - 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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Using Aluminum Foil

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  • Using Aluminum Foil

    Has anyone given any thought to using aluminum foil as the first layer of insulation? What I mean is under the floor fire bricks and covering the dome before the ceramic blanket / vermiculite.

    It seems like this would be a very simple and cheap way to improve thermal retention.

  • #2
    Re: Using Aluminum Foil

    I am going to use foil oven the dome of my oven before i cover it with a couple inches of concrete. Then put the layer of insulation mix.
    Toby

    Columbus, NE

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    • #3
      Re: Using Aluminum Foil

      I tried foil over my dome after the insulation layer and would not do it again. It provides a moisture barrier which holds the moisture in. Extremely hard to get the oven fully cured and also a pain after heavy downpours when the oven will inevitably get moisture in it even though it may be waterproof on the outside. If the outside humidity is 10% then your porous inner layer must also be getting its fair share of moisture. I know it is the foil layer holding in the moisture because I poked lots of little holes through the foil in two places. Guess what ? that is exactly where it gets hot on the outside while the rest is only warm, indicating steam finding its way through the holes.
      Kindled with zeal and fired with passion.

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      • #4
        Re: Using Aluminum Foil

        A foil layer over the dome, then another layer of concrete over that will not insulate because it is in direct contact with both materials All it does is stop moisture from the concrete leaching into your dome bricks or inner refractory layer. This would seem sensible to keep the concrete layer wet for increased strength, but it will still prevent moisture movement between the layers later which is a disadvantage. Some folk also report that foil breaks down with heat. This topic has come up before. Try a search for previous threads.
        Dave
        Kindled with zeal and fired with passion.

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        • #5
          Re: Using Aluminum Foil

          Was thinking of using foil myself, as it's recommended in Alan Scott's book "the bread Builders". Albeit thats for a barrel oven.

          Having now read this post, I won't be. Thanks for clearing that matter up...

          Regards

          Jon
          Cardiff

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          • #6
            Re: Using Aluminum Foil

            The consensus seems to be that foil is pretty much useless. Save the step.
            My geodesic oven project: part 1, part 2

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            • #7
              Re: Using Aluminum Foil

              Thanks for the "tribal knowledge" out there. It sounds like you guys have saved me some heartache.

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              • #8
                Re: Using Aluminum Foil

                I just read my previous post and realized I said 10% humidity. Of course I meant 100% Sory if that led to confusion.
                Dave
                Kindled with zeal and fired with passion.

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