Octagonal Metal Roof Cap

Lets say, hypothetically, that I'm going to build a 25 foot tall wizard tower in the woods.
The building is octagonal, which means there will be 8 ridge caps intersecting at the peak of the metal roof. The roof is 18/12 so it'll be a pretty big area where the ridge caps intersect. How the hell do I cap or seal that? I have everything else figured out (aside from permits but this is another step in that direction)

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  1. 2 months ago
    Anonymous

    I don't even know how to research this sort of thing which is why I ask

  2. 2 months ago
    Anonymous

    Overhang it and make eaves? Why does it need to be airtight? What dark machinations are you doing?

    • 2 months ago
      Anonymous

      >airtight
      I just need the very tip to be shielded from rain. I'm not sure how to acquire or attach some type of roof cap.
      >What dark machinations are you doing?
      It's basically just going to be an office. My wife is letting me build it in hopes that I stop trying to do similarly absurd things in our actual house

      • 2 months ago
        Anonymous

        Sheet of copper or tin cut and folded into a cone then nailed to the top. Possibly a bit of brazing to seal the tip and some overlap in the folding to make it watertight.

      • 2 months ago
        Anonymous

        >My wife is letting me build it in hopes that I stop trying to do similarly absurd things in our actual house
        I'm building a similar tower in a year or two on the hilltop in my woods for similar reasons; considering starting with a two-tier gazebo type thing and closing it in later if I like it well enough. It seems polite to ask her opinion before I visibly modify the house or anything adjacent to her gardens but innawoods I just do whatever.

      • 2 months ago
        Anonymous

        Couldn't you just make a solid tip from a mold, then put it on top of a truncated octagonal pyramid? The tip wouldn't have to be very big, and you probably wouldn't notice it from afar

  3. 2 months ago
    Anonymous

    I scrubbed through this video on mute for a bit and I think there's a chance it could be useful.

    ?si=onzo-0gG10bjCyIE

  4. 2 months ago
    Anonymous

    Check out Guédelon Castle, it’s a French giga larp project where they’re making a castle from scratch with period tools.
    It’s got some handy shit that could help you

    • 2 months ago
      Anonymous

      https://i.imgur.com/TDIjTDj.jpg

      I scrubbed through this video on mute for a bit and I think there's a chance it could be useful.

      ?si=onzo-0gG10bjCyIE

      I'm not larping, this is all cinder blocks and standing seam. Its basically the same as a shed as far as materials goes, just a weird shape.
      Forgetting the "tower" aspect, how do I cap an 8 sided metal roof?

      • 2 months ago
        Anonymous

        Neither are they, anon is moronic. It’s a real castle.

        • 2 months ago
          Anonymous

          Yeah I knew about it already, that's not at all what I'm building

          silicone from a caulking gun you notools moron.
          did you really need to ask here and not just google it in the first place?

          Are you telling me the peak of a roof can be silicone? Did you misread something or am I just not following what you're saying

      • 2 months ago
        Anonymous

        silicone from a caulking gun you notools moron.
        did you really need to ask here and not just google it in the first place?

      • 2 months ago
        Anonymous

        Cut this shape out of a flat sheet of steel, where the radius is how far you want the cap to go down
        For an 18/12 roof that doesn't have to be very long
        Bend each line a bit at a time until the first and last faces overlap as perfectly as possible, then spot weld / epoxy them together
        You'll need something to seal the tip, then paint the hell out of it. Maybe do a mockup with cardboard first

        • 2 months ago
          Anonymous

          Holy shit thanks anon. Didn't know it was something I could actually make.
          >You'll need something to seal the tip
          Like silicone or some other piece of metal or what?

          • 2 months ago
            Anonymous

            I mean, you could probably buy an artisan one online but this is diy after all
            Since it'll barely be visible I would use a galvanized / hot dipped / whatever screw / nail and epoxy it into the tip
            Keep in mind if you cut / bend pre-painted sheet metal it can ruin the coating, so you'll definitely want to research and prep for a final coating on whatever you make

            Also this is what the software says for a mathematically perfect 18:12 octagon pyramid, your actual roof may vary a little.

            • 2 months ago
              Anonymous

              Awesome, this is perfect. Thanks for the info man

              • 2 months ago
                Anonymous

                No problem, hope it goes well

          • 2 months ago
            Anonymous

            you could just do another smaller one and stagger the seams (e.g. spin it 180º)

  5. 2 months ago
    Anonymous

    just hammer some lead over the top fa.m

  6. 2 months ago
    Anonymous

    Pic is my actual plan so far by the way. 25' tall, 8' at the widest inside, with the width of the 8 internal walls being about 40". The door starts high because of the water table. There will be a staircase there. The arched doorway and window frames will be custom cast stone that I'm 3d printing the molds for. Technically it is 2 stories but it will be uncomfortable to stand on the second floor which is fine because that's where the desk will be. I'm building everything to code.

    • 2 months ago
      Anonymous

      8' diameter is pretty tight. My house is french country / french provincial and I have an octagonal turret. I went 11' diameter and it's a good size for a cozy study but emphasis on cozy, I would have gone a little bigger if I did it all again. 8' will feel like a closet or a bathroom.

      • 2 months ago
        Anonymous

        >I would have gone a little bigger if I did it all again.
        How big?

        • 2 months ago
          Anonymous

          Maybe just 12' or 12'6", too wide and the proportions are off... but with furniture in there the feel of the space starts to close in quicker than you'd think.

      • 2 months ago
        Anonymous

        Maybe just 12' or 12'6", too wide and the proportions are off... but with furniture in there the feel of the space starts to close in quicker than you'd think.

        https://i.imgur.com/PS6oHdM.jpg

        Blast

        you could just do another smaller one and stagger the seams (e.g. spin it 180º)

        Sheet of copper or tin cut and folded into a cone then nailed to the top. Possibly a bit of brazing to seal the tip and some overlap in the folding to make it watertight.

        Much obliged. Adding to my document

        >My wife is letting me build it in hopes that I stop trying to do similarly absurd things in our actual house
        I'm building a similar tower in a year or two on the hilltop in my woods for similar reasons; considering starting with a two-tier gazebo type thing and closing it in later if I like it well enough. It seems polite to ask her opinion before I visibly modify the house or anything adjacent to her gardens but innawoods I just do whatever.

        >two-tier gazebo type thing
        That sounds awesome and I hope to see it here someday

  7. 2 months ago
    Anonymous

    15 seconds in google. Just cut and solder a cone and slap it on top.

    • 2 months ago
      Anonymous

      Blast

  8. 2 months ago
    Anonymous

    really? just use a cone for the cap...how moronic can you be to not realize that! i have an extra chromosome and it took me 10 seconds

    • 2 months ago
      Anonymous

      roofing doesn't lay on a radius as well as a flat
      also, wasted quads

      [...]

      • 2 months ago
        Anonymous

        you just connect the roof with whatever polygon you want. they don't have to connect perfectly at the top. you cap the whole with a flat piece, and flash over the whole thing with a small cone that you would barely see from the ground.

  9. 2 months ago
    Anonymous

    You may be able to find something pre-made.
    Good search terms:
    gazebo cap flashing
    gazebo roof cap
    turret cap flashing
    octagonal roof cap

    These guys have a selection.
    https://www.statuary-weathervane.com/contents/en-us/d298.html

    Make sure you use a compatible metal since some metals left in-contact will have galvanic corrosion.

  10. 2 months ago
    Anonymous

    Why cap it…4 drops ofvrain aint shit

  11. 2 months ago
    Anonymous

    >How the hell do I cap or seal that?

    try copper finials or spires

  12. 2 months ago
    Anonymous

    Dont try anything because you’re obviously full of shit

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