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Perlite vs. Vericulite final Insulation layer - 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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Dome Installation Video - Casa / Premio / Modena


For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.


If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

Thanks for participating in our Forum. We will have more video content available soon.
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Perlite vs. Vericulite final Insulation layer

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  • Perlite vs. Vericulite final Insulation layer

    I am waiting the 3 weeks for my 6" Cladding to dry and am wondering if I should use Vermiculite loosely, mixed 6:1 with portland cement, or use Perlite.
    I build a brick wall up from the base, so now I have a 5" gap between the cladding and the final wall, so I can pour anything in there. Is one better than the other. They both cost exactly the same, and the Vermiculite says 100% Asbestus free certified on it.

    Thanks for any suggestions.


  • #2
    Re: Perlite vs. Vericulite final Insulation layer


    I am waiting the 3 weeks for my 6" Cladding to dry
    why wait, get some 'gentle' fires going, not to bake the oven but add alittle heat to encourage the drying process. It will get the air moving, drive a little heat into the dome and accelerat the evaporation process. Remeber to take it gently. See what moisture is coming out through the bricks before increasing the temperatures.

    As far as your insualtion, I would be tempted to line the back of your outer wall with a thicker 'caterers aluminium foil' and pour in vermiculite. This will give the best (well at least in my opinion), as 5" is all that is needed, the foil will add that extra protection and keep it dry should moisture get through the bricks in a wet period.

    Prevention is better than cure, - do it right the first time!

    The more I learn, the more I realise how little I know

    Neillís Pompeiii #1
    Neillís kitchen underway


    • #3
      Re: Perlite vs. Vericulite final Insulation layer

      I chose the medium grade vermiculite from ULINE shipping supplies.. Worked fine for me.. and as i understand, Vermic is 100% natural.. I dont know if the perlite is or not.. If you are Just filling the voids, you dont need to mix with portland.. only pour it in.. you can mix it,, Im not sure if that makes a difference ... Maybe someone else can verify that ??
      you can sometimes buy premixed vermicrete from a Pool building supply company..


      • #4
        Re: Perlite vs. Vericulite final Insulation layer

        Vermic is 100% natural..
        They're both naturally occurring minerals with the strange property of "popping" like popcorn when heat treated. This is what perlite looks like:

        This is what vermiculite looks like:

        Vermiculite is the short mineroligical name for hydrated laminar magnesium-aluminum-ironsilicate which is similar to mica in appearance. Vermiculite is light-weight, fire-resistant, odorless, absorbent, and expands into accordian shaped pieces when heated also known as being "Exfoliated". These pieces of exfoliated vermiculite insulation sometimes resembles worms, hence the prefix "vermi" which is latin for worm.
        My geodesic oven project: part 1, part 2


        • #5
          Re: Perlite vs. Vericulite final Insulation layer

          If you mix vermiculite or perlite with cement and water you then have the problem of removing the water by a combination of air movement, temp. and time. Add the stuff dry and you have less water to remove from your oven. Be careful about using a foil layer for added insulation. It does a great job of locking in the moisture. I tried this and my oven took months to dry properly. At least poke lots of little holes all over the foil to allow the steam out.
          Kindled with zeal and fired with passion.


          • #6
            Re: Perlite vs. Vericulite final Insulation layer

            "This is what perlite looks like:"

            That's what the "un popped" stuff looks like. (If if looks like the above photo, don't use it.)