Straightening Aluminum Coil


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Old 07-22-09, 09:13 AM
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Straightening Aluminum Coil

Hello,

I need to replace some gutter flashing on my mother-in-law's house. What's there is too short, and water flowing down the roof valley overwhelms it during a heavy rain.

I was looking for a piece of white flashing that I could bend for the inside corner on the gutter, but wasn't able to find it. I ended up with a 10"x10' roll of white aluminum coil, which I want to form into the flashing I need for that corner (and elsewhere). I'm able to score and break it easily, and I am even able to form 90 degree bends using a homemade brake built with a piano hinge, but how do I straight the aluminum coil so it doesn't curl? I've had it weighted down for a day or so, and that helps, but it's still a long way from flat. If I install it in its present form it will curl at the ends and look pretty bad. Also, I want to overlap a few pieces in another spot, and with the curl the overlap won't work out too well.

Thanks in advance for any tips.
 
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Old 07-23-09, 04:48 PM
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What happens if you flip it over & secure it in place?
 
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Old 07-23-09, 05:24 PM
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It curls at the corners. It's only secured on the bottom edge, so the top edge is free to do as it pleases.
 
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Old 07-23-09, 05:33 PM
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How about aluminum from an AC duct instead?
 
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Old 07-23-09, 06:01 PM
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I cut the corners off when I put up a piece of flashing for an inside corner. I never thought about the curling, it was just something that my company always did. Here's a poorly drawn perspective picture

 
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Old 07-23-09, 07:46 PM
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You can try rolling up your coil in the opposite direction, not as tight, and see if you can reduce the coil effect.

Bud
 
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Old 07-23-09, 08:22 PM
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I'm not quite sure I understand the shape of the piece you say is curling. Are you making an inside corner diverter, like Rob_C drew?

If you have a "long" piece of coil that has one leg that's tall and stands straight up, and you want it to lay straight, you either need to add a bend onto the length of it (either a 90 degree bend, or even a slight crease will help), or fold a hem on the edge of it (a hem is a crushed 180 degree bend), or roll a rib into it with a special tool. Sometimes a combination of bends is useful to add rigidity to a piece.
 
 

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