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Wraping half-circle window

JonL | Posted in Construction Techniques on October 16, 2005 08:14am

I’m having some problems coming up with a way to bend Aluminum on a half circle. Has anyone had to wrap window trim on a semi-circle?

Any help and suggestions will be greatly appreciated. Thanks

Jon L

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  1. User avater
    JeffBuck | Oct 16, 2005 11:56pm | #1

    Has anyone had to wrap window trim on a semi-circle?

     

    not flat stock trim but needed "J channel" for a round top window on a remodeling job that was improperly installed by the original builder.

    called a local metal shop and had them make it up in zinc ... then I spray painted it to match.

     

    Jeff

        Buck Construction

     Artistry In Carpentry

         Pittsburgh Pa

    1. blue_eyed_devil | Oct 17, 2005 02:53am | #2

      Great idea Jeff.

      blue 

      1. User avater
        JeffBuck | Oct 18, 2005 06:24am | #3

        it was my only choice.

        the zinc was their idea ... I forget what I originally asked for ... but what ever it was ... it wasn't paintable.

         

        I was removing a big fixed pane builders grade round top ... 7ft tall and 4ft wide ...

        the mini-mansion had the back wrapped in aluminum siding ... only 10 yrs old ...

        and they just butted the aluminum kinda close to the window and caulked the hell outta it.

        That was it.

         

        No wonder their drywall was kinda soft? All the exterior trim .. shot ... and I found all the jacks and studs anywhere near that window shot as well. Funny thing ... as I hate ThermoPly ... the sheathing was fine! Just tore back as much as I had to to surgically replace the framing ... and re-Thermo'd.

        Had to find a way to "weather-tite" the existing siding ...

        tore is all all that part with the intent of reusing ... and went old school.

        30lbs felt ... over the old and new TherMo ... flex wrapped the nailing flange ...

        and set the custom J as the first line of defense.

        I forget what it cost me ... $200 or $300 bucks? But it was well worth it.

        Had it made so the show-face of the J was wider ... matched the width of the flats on the vinyl clad windows on each side ... came in 3 sections ...

        and big semi circle for the top ... and two legs.

        just cut/fit them like any other J ...

        worked great.

         

        one can primer and 2 spray cans high gloss white ...

         

        looked like the existing. Water directed away ... life was good.

        little company here in Pittsburgh ... but they have the contract for all the historical roofing and metal work in and around DC.

        Jeff    Buck Construction

         Artistry In Carpentry

             Pittsburgh Pa

        1. dug | Oct 20, 2005 04:12am | #7

          jeff, got a job coming up to replace a window thats similar to this. its 7' tall and 6' wide. how heavy was your window. the one i need to replace is second story and i am trying to figure if two people can do this without to much ''wrassling''! im sure the HO will be spectating and you gotta look like ya got it under control at all times ya know!

          1. User avater
            JeffBuck | Oct 21, 2005 01:34am | #8

            Yours sounds similar ...

            ours was a single pane ... nothing to remove to make lighter.

            Not sure of the exact weight ... but it was a hair over "heavy"!

             

            two guys could move it around the site ... but up and into place ... add akward to the mix.

            Couldn't go thru the house ... had to get it up to the first floor from the walk-out basement level below .. and over the hedges.

            set pump jacks ... me ... another strong buddy ... and his muscle bound helper got it up on the jacks. Me and my buddy pumped her up ... pretty much over stressing the pump jacks and pic ... then ... with his helper inside reaching out ... we got the bottom set and he was able to kinda/sorta pull in and steady it.

             

            it was quite the exciting little job!

             

            Jeff    Buck Construction

             Artistry In Carpentry

                 Pittsburgh Pa

          2. blue_eyed_devil | Oct 21, 2005 02:39am | #12

            Dug, that isn't a two man window. It will be plate glass and it will be heavy! The glass will bounce and if you jiggle it too much it will  crack.

            We used to do that type of window with a minimum of three, but four guys is much easier.

            If there were three, I was usually the lead. I'd walk up the ladder dragging the window behind me with one hand. The other two guys would lift and follow it up from below. When I got to the opening, I'd walk through and onto another waiting ladder. I would lift a little at this point, but my primary task was to keep the window from falling out as they lifted it into the opening.

            Good luck.

            blue 

          3. dug | Oct 21, 2005 04:03am | #13

            Blue,  thanks for the heads up! I was thinking.... What if I extended a stout ladder up above the window opening and rigged up a windless[pulley] to the ladder rungs and harnessed the window with rope to pull it up and had a man on the inside to pull it in the hole at the bottom.   This is a custom window that we made a template for to send to a  shop to have a replacement made. Its in a brick house so if this thing doesnt slide in the first time this job could get ugly quick!  What ya think, good idea?  Bad idea?   I will be sure to have at least three people.     Many thanks.                     

          4. blue_eyed_devil | Oct 22, 2005 04:22am | #14

            Dug, I would have to agree that anything that gives you a mechanical advantage would be superior to me dragging that thing up behind me. We always had that option, but the time it would take to rig it would make me just grab the window and haul it by hand.

            Good luck. I cant help you with setting up the pulley because I've never used one but anythings possible.

            blue 

          5. User avater
            JeffBuck | Oct 22, 2005 07:22am | #15

            one thot I had after the fact ...

            if I had to do it again and had the room ...

            had an idea of building the sill plate ... short by 11 1/2 inches each end ...

            so I could slip a 2x12(11 1/4) thru that slot ... out from the inside .. over said sill .. and on top of the pic set on the pump jacks.

            That way ... there's no "dead space" ... no open space between the pic ... where the window sits and was raised up from ... and ... the sill .. where it has to live.

            It was a bit of concern tipping one corner into the opening and just hoping that second corner set just fine .... without anything kicking out and twisting ... and having the whole new unit ending up in the bushes below.

            "no where to go" is a good thing.

            Jeff

                 Buck Construction

             Artistry In Carpentry

                 Pittsburgh Pa

  2. seeyou | Oct 18, 2005 02:26pm | #4

    What Jeff said. You need a body shop or sheet metal shop that has shrinkers/stretchers. The ones I make are normally "Z" shaped with about a 1/2" front verticle. I use copper which is paintable and works well.

    Birth, school, work, death.....................

    1. JonL | Oct 18, 2005 07:06pm | #5

      Ok, Thanks

    2. User avater
      JeffBuck | Oct 19, 2005 03:08am | #6

      now I remember why zinc.

       

      it was to be J for the existing aluminum ... metal guys said zinc was a better "mis-matched metals" choice. Copper was my first thought.

       

      Jeff    Buck Construction

       Artistry In Carpentry

           Pittsburgh Pa

    3. User avater
      Sphere | Oct 21, 2005 01:39am | #9

      Ok,..I thought I waas clever using downspout crimpers to curve the DE on the dormers....LOL Now ya tell me you have a gizmo?   Spheramid Enterprises Architectural Woodworks

      "We adore chaos, because we love to restore order"

      Mauriets Chavailier Escher

      1. seeyou | Oct 21, 2005 01:43am | #10

        I can't do a hemmed edge with the shrinker and it takes three times as much butt muscle to use it. You had the right tool for the job.Birth, school, work, death.....................

        1. User avater
          Sphere | Oct 21, 2005 01:48am | #11

          I knew ya musta had a reason..

          Hey, that trailer scene happen JUST before I got there , talking to you...some butt hole left out the lug nuts or axle mount bolts..awesome. 

          Wanna bet the dishes are broke?  Spheramid Enterprises Architectural Woodworks

          "We adore chaos, because we love to restore order"

          Mauriets Chavailier Escher

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