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  • #46
    Yes, I do love the upper transition "curve". If you have a smooth flow, you don't have cool spots (ledges/edges) that collect creosote. The flow for my oven out is pretty good, however I have a straight wall and top ledge immediately above the oven opening (into the smoke funnel). I do get buildup there and when I open either my fire door or working door, the pulse of heated air rising up the flue will often cause a brief soot/creosote "snow fall" onto the landing . So I always include a little pause between changes to "flow up the chimney" and bringing any food items out onto my landing.

    You oven's looking spectacular!
    Last edited by SableSprings; 04-23-2019, 09:58 AM.
    Mike Stansbury - The Traveling Loafer
    Roseburg, Oregon

    FB Forum: The Dragonfly Den build thread
    Available only if you're logged in = FB Photo Albums-Select media tab on profile
    Blog: http://thetravelingloafer.blogspot.com/

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    • #47
      Thanks Mike,

      Interesting observation for those wondering about the time it takes for vermecrete to dry:
      I poured the insulation for the front landing 7 weeks ago 7 vermiculite (No3) 1 cement at 30% hydration
      I have just taken off the front of the form (boxing) and you can see clearly that there is still a lot of moisture in the vermecrete, It has been baking in the sun at 40c plus for most of the seven weeks
      This is just inside the form work so imagine how wet it is under the hearth, luckily I have drilled weep holes under the base to allow the excess moisture to escape when I start to heat the oven up
      https://community.fornobravo.com/for...-s-48inch-oven

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      • #48
        Originally posted by Karangi Dude View Post
        Thanks Mike,

        Interesting observation for those wondering about the time it takes for vermecrete to dry:
        I poured the insulation for the front landing 7 weeks ago 7 vermiculite (No3) 1 cement at 30% hydration
        I have just taken off the front of the form (boxing) and you can see clearly that there is still a lot of moisture in the vermecrete, It has been baking in the sun at 40c plus for most of the seven weeks
        This is just inside the form work so imagine how wet it is under the hearth, luckily I have drilled weep holes under the base to allow the excess moisture to escape when I start to heat the oven up
        Yes, this doesn't surprise me. The vermicrete can only really dry from the top surface when all others are covered. It invariably takes longer than you’d think also when you are judging from the appearance of the top surface which looks really dry. I bet that steel would also get pretty hot standing in the sun, it would be pushing out moisture from the bottom.
        You may be interested in an experiment I did a number of years ago (attached).
        I have just done some more tests on some different insulating materials (calsil board, 5;1 vermicrete, 10;1 vermicrete, pumice, IFB, loose perlite) to record both absorbency and drying rates, but I'm currently battling with Excel and graphs to get it into a decent readable form. I will post it when done.
        Vermicrete insulating slab copy.doc.zip
        Attached Files
        Last edited by david s; 04-26-2019, 11:29 PM.
        Kindled with zeal and fired with passion.

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        • #49
          Thanks David,

          I have read some of the test results you have done in the past they all make good sense, what I was trying to point out is that there is a lot of water under the hearth that needs to be removed one way or another and that a lot of people don't realise that it is hard to remove
          https://community.fornobravo.com/for...-s-48inch-oven

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          • #50
            Closed up the oven by putting the last row of bricks above the door arch, I then climbed inside and did some pointing up and cleaning up, that part of building ovens is my least favourite thing
            Last edited by Karangi Dude; 05-02-2019, 11:48 PM.
            https://community.fornobravo.com/for...-s-48inch-oven

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            • #51
              Coming along nicely. Yes, climbing inside is not pleasant but a rite of passage.......LOL.
              Russell
              Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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              • #52
                I like the “red carpet” entry
                Kindled with zeal and fired with passion.

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                • #53
                  I have to say that my mind immediately started playing Steppenwolf's 1968 classic Magic Carpet Ride when I saw your entry pic! Thanks for not only doing the documentation on this fabulous build, but for bringing me back a great music memory!
                  Mike Stansbury - The Traveling Loafer
                  Roseburg, Oregon

                  FB Forum: The Dragonfly Den build thread
                  Available only if you're logged in = FB Photo Albums-Select media tab on profile
                  Blog: http://thetravelingloafer.blogspot.com/

                  Comment


                  • #54
                    Funny Mike, I was singing that same song as I was going in and out cleaning up the entry (those were the days)

                    Well, you don't know what we can find
                    Why don't you come with me little girl
                    On a magic carpet ride
                    Last edited by Karangi Dude; 04-30-2019, 02:36 AM.
                    https://community.fornobravo.com/for...-s-48inch-oven

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                    • #55
                      Set out and laid the sides of the flue arch leaving a thermal break of about 12 mm, I then welded the folded steel sides for buttress and filled them with vermecrete
                      https://community.fornobravo.com/for...-s-48inch-oven

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                      • #56
                        I cut the 2 corner bricks of the flue arch laid them then filled the sides with vermecrete for more buttress

                        I finishes making the form for the flue arch, I then set it in place and cut the flue arch bricks and got them laid
                        https://community.fornobravo.com/for...-s-48inch-oven

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                        • #57
                          I had to do some fancy cutting so the bricks at the top of the flue arch would be level for the flue pipe riser that is a two skin stainless (8'' and 10'') 200mm and 250mm
                          I decided to go 50mm higher so I cut a 200mm hole in a 300mm x 300mm x 50mm tile (now that was a bit different) it took some doing but it is now nice and level
                          The flue pipe opening from inside the arch to the top of the 50mm paver tapers from about 10'' at the bottom of the arch bricks to 8'' where the riser will sit.
                          I mortared them in place and pointed up the inside of the flue arch
                          Last edited by Karangi Dude; 05-15-2019, 04:47 PM.
                          https://community.fornobravo.com/for...-s-48inch-oven

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                          • #58
                            Before laying the entry bricks I poured a layer of vermecrete to bring it up to height, to make a thermal break I used a 50mm thin walled stainless tube filled with blanket and cut a piece of fibre board to sit it on
                            I then laid the entry bricks up level with the stainless tube, there will be a decorative arch to go out front at a later date
                            https://community.fornobravo.com/for...-s-48inch-oven

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