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Insulating Blanket - Forno Bravo Forum: The Wood-Fired Oven Community



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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Insulating Blanket

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  • Insulating Blanket

    I am posting this in both places -- here and fornobravo/forum, where
    we will make it sticky.

    Using a ceramic insulating blanket is a good idea, for both brick
    ovens and refractory ovens, because they are efficient, don't use a
    lot of space, and keep loose insulation from ever getting into your
    oven. And they aren't that expensive. Would folks agree with that?
    Unless budget is a serious issue, you should consider using it. (We
    include a large 6#, 1" blanket as part of our refractory ovens.)

    If you are looking for a place to buy a ceramic insulating blanket,
    contact randy.muchow@thermalproductsco.com. They are in Atlanta, and
    ship UPS. Tell them to give you the price for Forno Bravo customers.

    If you find a better source, or a good regional source, let us know.


  • #2
    Try this E-bay seller.* He is in*Portland *He has some interesting stuff*regarding refractory materials and blankets







    • #3
      hi james,

      o.k., i am sold on using a insulating blanket, but how much
      pumice/vermiculate insulation can we save that way ?(what would be the
      ratio, e.g 1inch insulation blanket equals 3 inches of vermiculate as
      an example???)
      i really would like to have a super insulated oven, yet like to get
      down in thickness..., since i also like to have as much space on the
      side of the dome for putting things down while using the oven.



      • #4
        The rule of thumb is 1" blanket and 4" vermiculite. I had an insulation engineer run a test, and conclude that the blanket replaces 2" of loose vermiculite. We had them run a simulation where they added 1" of insulfrax, and reduced 1" of vermiculite. 1":4", 2":3", etc. over a 24 hour 1000F exposure. The outer face tested consistently dropped by adding 1" more insulfrax and 1" less vermiculite.

        1" Insulfrax Blanket 6#, 4" Vermiculite 1000F** 172F

        2" Insulfrax Blanket 6#, 3" Vermiculite 1000F** 161F

        3" Insulfrax Blanket 6#, 2" Vermiculite 1000F** 151F

        4" Insulfrax Blanket 6#, 1" Vermiculite 1000F** 142F

        5" Insulfrax Blanket 6# ******* 1000F** 135F

        Thinking about it, I should ask him to add 1# insulfrax, and drop 3" of vermiculite and re-run the test. I would note that after 24 hours of 1000F, (which you will not approach), the outer face is barely warm.

        I agree that you want the oven well-insulated, but think that you have some wiggle room. My oven here has 1" of low-tech blanket insulation (I don't even know the name of it, but it can't be close to Insulfrax in efficiency), and 2-3" of vermiculite, and I have never felt heat in my stucco walls. This is an extreme example -- I did it intentionally to see how it would work, and I think we can take a small lesson from the experiment.

        Long answer to a short question -- but some interesting background info.