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Vermiculite Grades - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

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.
- 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.

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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Vermiculite Grades

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  • Vermiculite Grades

    I'm gathering some materials and have found some Vermiculite that is A4 course grade. I don't think this is what I want but just wanted to verify. I tried to search for just A4 and got no results and when I search for vermiculite A4 I got pages upon pages and have not been able to find out yet. Thanks for your help.

  • #2
    Re: Vermiculite Grades

    we use #3 for our customers. I think it comes in 4 grades and depends on the "exfoliation" to what grade it becomes. #1 is the smallest, with #4 being the largest.


    • #3
      Re: Vermiculite Grades


      Regarding searching the forum, it disregards small words (like A4) in its search parameters - so if you need to search for small words, do a Google search specifying the site like this:

      a4 vermiculite site:fornobravo.com

      However, in this case you'll just turn up your post and another unrelated one.

      My Clay Oven build:


      • #4
        Re: Vermiculite Grades

        the density of the finer vermiculite seems to be the same as the coarse stuff ie the bag seems to feel about as heavy. The finer stuff seems to hold together better, so I'm continuing to prefer it.
        Kindled with zeal and fired with passion.


        • #5
          Re: Vermiculite Grades

          In the New England area vermiculite has much coarser, chunkier and larger paticle size than the Perlite which is a fine, small uniform size. They are both the same composition by the same manufacturer & distributor sold primarily for masonary insulation. The tech data sheets indicate the finer Perlite is 5% better for insulation presumably because of smaller pore space and more uniform filling of spaces. However this may not correlate with a slab application where the mixture is mixed with portland. The chunkier vermiculite alone makes a lumpier courser mixture especially for screeding. A mixture of the two sizes is smoother. The fine perlite alone makes a very smooth mix for final screeding. Glosta