Cut the downspout with your tin snips.
Cutting aluminum gutter downspout.
If you re using tin snips you ll want to use one of shears to poke a hole in the downspout along the line you ve marked when you measured.
Once you have marked the correct length on the downspout lay it down on a flat surface that has the proper clearance for cutting.
To cut the aluminum you can use a metal cutting blade with the jigsaw.
This video is about helpful hints cutting the downspout.
Away from the cutting area to prevent injury.
Because aluminum is soft and very pliable the cutting should be very easy and smooth.
For cutting any kind of sheet metal tubing the weapon of choice.
Grab one side of the gutter and lower the saw slowly to the gutter.
Wear protective glasses and gloves and keep all loose jewelry hair etc.
Cut up the corner to your closest measurement mark.
Plug in the saw and squeeze the trigger button.
Crimp three times across both long edges and twice on the narrow sides.
On the bottom of the gutter itself take a pencil or marker and trace the outline of a sleeve.
Then work the tin snips through the downspout and cut along the line until you ve completely cut through the downspout.
This method doesn t produce the cleanest results.
Opt for a workbench and clamps for extra stability.
Crimp one end of the downspout crimp one end of the short length of downspout with a special sheet metal crimper.
Begin your cut at one corner on the end you wish to make your cut.
This is the thing that connects the gutter and downspout together so it is important that it is placed correctly and securely.
Sheet metal pros use double cut tin snips either hand type or electric depending on work at hand.
This video is about helpful hints cutting the downspout.
Let go of the trigger when through and then pull the saw back up to its starting position.
Repeat the process for additional cuts.
Don t rush into cutting and maintain the cutting line straight.
There is simply no other way to make a nice clean cut in the middle of a 4 water heater vent for example or the downspout tubing in your case.
Now that you ve finished cutting the old downspout is ready to be replaced.
Step 2 drill four holes in each corner of the outline you made of the sleeve drill one hole.
Cut the closest corner to your first cut to the same spot.