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Vermiculite vs. Perlite vs. blend - 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.
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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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Vermiculite vs. Perlite vs. blend

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  • Vermiculite vs. Perlite vs. blend

    Is there any difference between vermiculite and perlite?

    I have seen several ovens with a vermicrete hearth insulation layer but perlite+concrete dome insulation. Is this for a reason?

    Some ovens even use a blend (mostly 2:1) of vermiculite : perlite in their insulation layers.

    I'm confused! All information / recommendations appreciate for an ingloo-style pompei brick oven.

  • #2
    Re: Vermiculite vs. Perlite vs. blend

    They both work fine. They are different colors and textures (vermiculite is brown cubes, perlite is white spheres) I used the perlite, and it's a little easier to see when it's fully mixed in, because the white turns grey, but it's mostly a factor of what's available and affordable.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: Vermiculite vs. Perlite vs. blend

      I used it under my hearth just fine 5.5 inches and over the dome as well. By blending the portland in the water I was able to mix in a lot of perlite.
      Last edited by Xabia Jim; 01-16-2009, 12:08 AM.
      sigpicTiempo para guzarlos..... ...enjoy every sandwich!

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      • #4
        Re: Vermiculite vs. Perlite vs. blend

        Perlite is a slightly better insulator than vermiculite, but is also slightly more expensive (at least it is where I live) I prefer the vermiculite to work with because perlite seems to have some really fine particles that are irritating if you breathe them, the vermiculite doesn't seem to have this problem. I guess these materials vary a bit from place to place.
        Kindled with zeal and fired with passion.

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        • #5
          Re: Vermiculite vs. Perlite vs. blend

          I used perlite (couldn't find vermiculite).

          I believe I used 5 parts perlite to 1 part portland. Tip - mix the portland and perlite (or vermiculite) first THEN add the water.

          My 2 cents.

          Dick

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          • #6
            Re: Vermiculite vs. Perlite vs. blend

            Bit of a noob question probably, but searching hasn't revealed the answer.
            When measuring the ratios, is it by volume?
            ie, 5 buckets of Verm + 1 bucket of Cement, and add water?
            This seems like a lot of cement, as 1 bucket will be ~25kg or an entire bag of cement?

            I'm nearly finished my dome, and will be thinking about the outer insulation soon.

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            • #7
              Re: Vermiculite vs. Perlite vs. blend

              By volume

              Les...
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              • #8
                Re: Vermiculite vs. Perlite vs. blend

                Originally posted by david s View Post
                I prefer the vermiculite to work with because perlite seems to have some really fine particles that are irritating if you breathe them, the vermiculite doesn't seem to have this problem.
                I completely agree.

                Stick with Verm if there is a choice.


                Perlite also flies into the eyes.
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