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tile flue question

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  • tile flue question

    If I want to use a clay tile chimney flue, do I need to use some form of masonry to support it, or can I use metal studs and backerboard to create a stucco chase?
    -jamie

    My oven build is finally complete!

  • #2
    Re: tile flue question

    I just sat mine into a bed of mortar then bricked around it. I did fill the gap between the flue and brick with the vermiculite/portland mix for insulation.

    Les...
    Check out my pictures here:
    http://www.fornobravo.com/forum/f8/les-build-4207.html

    If at first you don't succeed... Skydiving isn't for you.

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    • #3
      Re: tile flue question

      I should be more clear. When I say support, I mean the top end. The flue would be mortared to the vent transition I have built on my arch and the front of the dome.

      I guess my question is this: Is a lighter weight chase, a stuccoed box basically, enough to support the top end of the chimney flue and the chimney cap? I don't want to have to build a massive brick chimney; I am not confident in adding all that much weight to the arch, so I would have to go outward of that and build quite a large brick enclosure. Plus, the head of the design committee says she doesn't want to create the "mausoleum" look.
      -jamie

      My oven build is finally complete!

      Comment


      • #4
        Re: tile flue question

        Mausoleum's are cool. I think of mine as a crematory. I think you are good - gravity is on your side. The metal studs can carry a butt load of weight.

        Les...
        Check out my pictures here:
        http://www.fornobravo.com/forum/f8/les-build-4207.html

        If at first you don't succeed... Skydiving isn't for you.

        Comment


        • #5
          Re: tile flue question

          I used the steel studs to support the flue tile, with FB blanket between the studs and the tile. It's not moving.

          This picture is the best I have. I put the brick on top of the steel, but the steel also surrounds the flue tile and supports it on all four sides.

          Joe
          Attached Files
          Last edited by jmhepworth; 10-14-2009, 07:03 PM. Reason: Added picture
          Joe

          Member WFOAMBA Wood Fired Oven Amatueur Masons Builders America

          My thread: http://www.fornobravo.com/forum/f8/j...oven-8181.html

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          • #6
            Re: tile flue question

            I built a masonary flue, surrounded by metal studs and concrete board. The flue projected 1" above the top of the flue. i cut the concrete board close, then used a high temp caulk to fill the gap. I didn't use any insulation as i wanted to make sure i had a good draw. has stood up very well for more than 2 years.

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            • #7
              Re: tile flue question

              Why would insulation affect the draw?

              Joe
              Joe

              Member WFOAMBA Wood Fired Oven Amatueur Masons Builders America

              My thread: http://www.fornobravo.com/forum/f8/j...oven-8181.html

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              • #8
                Re: tile flue question

                I thought, and I could be very wrong, that we wanted to keep the flue hot so that it would create a stronger draw. And the concrete board gets quite hot to the touch.

                Maybe it doesn't matter, but i have fabulous draw, even with a large flue.

                Comment


                • #9
                  Re: tile flue question

                  I had the same thought, but my rationale was different. By insulating the flue, it would loose less heat and stay hotter. Mine also draws well -- 5 feet of 8 inch flue tile (6 inch inside). I suspect it simply doesn't matter. The other reason I used for putting insulation between the flue tile and the steel framing was that I wanted to hold the tile snuggly in place, but I did't want to attach anything to it.

                  Joe
                  Joe

                  Member WFOAMBA Wood Fired Oven Amatueur Masons Builders America

                  My thread: http://www.fornobravo.com/forum/f8/j...oven-8181.html

                  Comment


                  • #10
                    Re: tile flue question

                    I have also heard that insulating the flue would increase draw by allowing the tile to heat up faster; but I've also read about leaving airspace around the tile to allow for expansion and movement. That's part of the question for me. Insulate, or airspace? How soild?
                    -jamie

                    My oven build is finally complete!

                    Comment


                    • #11
                      Re: tile flue question

                      If you insulate with vermiculite/concrete mix, like Les, that should still allow for some expansion, yet provide stability. Many builders cover the entire dome with this stuff, and it works well. That's my plan. If you look at my pics, I used a steel framed surround with concrete board that I will stick on some stone veneer. The space in between is filled with vermicucrete. I think I went with the Mausoleum look that your wife was hoping to avoid!
                      Mike - Saginaw, MI

                      Picasa Web Album
                      My oven build thread

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                      • #12
                        Re: tile flue question

                        Insulate, or airspace?
                        The airspace IS insulation, as well as a provision for expansion. I think, in seismically active areas like California, that firestopping (which is a form of refractory insulation) is supposed to substitute for the airspace.
                        My geodesic oven project: part 1, part 2

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                        • #13
                          Re: tile flue question

                          I live in Sacramento, which is a seismically stable area (knock on wood). But does the airspace alone provide sufficient insulation? Would it be better to put in insulation? If so, would loose perlite filling the chimney chase be a good idea?

                          Mike, that's basically what I'm thinking/hoping, but with a slightly smaller enclosure. Or possibly just a chminey tower with an igloo. I don't know... the conversation about design styles has reached a fever pitch around the house recently, as we're at a crucial turning point.
                          -jamie

                          My oven build is finally complete!

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