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Perlite vs Expanded Perlite or Vermiculite - Forno Bravo Forum: The Wood-Fired Oven Community



Photo Galleries are back! Instructions below.

Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

Forum users will be able to access their “PhotoPlog” images through their user profile page by clicking on the “Media” tab.
They will also be able to browse other albums by going to the albums page. (On the forum site, there is a link in the black bar beside “Forums” to the albums.)

In order for users to create an album please follow the steps below.
1) Go to user profile page and click “Media”
2) Click Add Photos
3) Enter Photo Gallery Title in the first field
4) Click Upload or Select from Photo Album to add photos
5) Click Post
6) Once posted, the album will be created as a “Topic” on the albums page for the public to see. The topic title will be the “Photo Gallery Title” they created before uploading their photos.

To create this migration path we used vBulletin5’s default album structure. Unfortunately, it won’t work like the “PhotoPlog” but is an album/gallery component on the forum now.
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Perlite vs Expanded Perlite or Vermiculite

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  • Perlite vs Expanded Perlite or Vermiculite

    What is the difference in terms of insulating factor? Most of you out there, I assume, are using expanded Perlite or what I know as Vermiculite. Is that a true assumption? Even so, how much insulating factor difference is there in the two. I'm sure people are using both.
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  • #2
    Re: Perlite vs Expanded Perlite or Vermiculite

    Perlite is a naturally occurring mineral that looks like this:

    As far as I know it has little or no insulation value.
    When crushed and heated, it pops like popcorn and produces the little lightweight white spheres that we are talking about in oven building.
    Vermiculite is also a heated mineral, but it's brown in color, and the chunks are cubic instead of spherical.

    They both work fine for oven insulation. Outside the US there may be some question of whether vermiculite is asbestos free, as the two minerals can be found in the same formations. For this reason, I'd stick with perlite if you can get it.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Perlite vs Expanded Perlite or Vermiculite

      Expanded Perlite has an R value of about 4 per inch of thickness. Vermiculite has an R value of about 3.4 per inch of thickness. Perlite also tends to be cheaper.


      • #4
        Re: Perlite vs Expanded Perlite or Vermiculite

        I found the perlite was more "workable" in terms of screeding and leveling.