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sawdust vs. vermiculite insulation - 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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sawdust vs. vermiculite insulation

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  • sawdust vs. vermiculite insulation

    hey oven, pizza, bread, building lovers. i hail from the olympic peninsula in washington.

    i have taken part in building 3 cob ovens at this point, enjoyed baking in all but have been disappointed in their ability to hold heat, especially in the 475 degree range.

    i have just finished building a 27 by 32 oven and recently got a lot of small wood chip/sawdust material. i was planning on doing 6 inches of insulation with the chip sawdust and clay but i am beginning to think i might be much better off with vermiculite. i insulated the hearth with vermiculite portland and layer of 3 1/2 inch bottles on their side.

    the sawdust was free but im thinking i might want to just spend the extra for a better insulator. thanks.


  • #2
    Re: sawdust vs. vermiculite insulation

    You could keep a book to take bets on the sawdust catching fire before rotting.


    • #3
      Re: sawdust vs. vermiculite insulation

      thanks for your friendly advice. just trying to keep it cheap and stay out of the hardware store.


      • #4
        Re: sawdust vs. vermiculite insulation

        Kiln builders often use sawdust as an insulating material. They fire to temps way higher than we do. Maybe the sawdust burns, depending how close it is to the fire source and how high the temp goes, but what does it matter if it burns anyway, the result is a void which heat does not readily pass through.
        Kindled with zeal and fired with passion.


        • #5
          Re: sawdust vs. vermiculite insulation

          yeah, thats ultimately what you want. a friend recommended using straw which will do the same thing but provide more airspace, mix easier with the clay slip and be faster to apply.


          • #6
            Re: sawdust vs. vermiculite insulation

            Insulating firebrick voids are made with sawdust, but they are fired to a high enough temperature to completely burn the sawdust to create holes in the brick. Any plan which leaves the sawdust in contact with hot masonry is doomed to fail, imo.
            My geodesic oven project: part 1, part 2


            • #7
              Re: sawdust vs. vermiculite insulation

              "thanks for your friendly advice. just trying to keep it cheap and stay out of the hardware store."

              Vermiculite (or perlite) is not that expensive. Check with local plant nurseries.


              • #8
                Re: sawdust vs. vermiculite insulation

                on another thread someone mentioned McMaster-Carr as a source for Vermiculite. I needed some recently so I ordered a bag instead of driving all over town trying to get it from a nursery. IIRC, the 4 cubic foot bag was ~$30 including shipping and was on my doorstep in three days. Hard to beat that for easy, efficient and cheap.