Locate where you want to place your new downspout.
Adding downspout to existing gutter.
If you have a stretch of gutter with only one downspout the best bet is likely to add the new one at the opposite end.
Measure from the gutter to the wall of the house and then from the gutter to the ground.
Adding a downspout to an existing gutter.
Just be aware that if the gutter was hung correctly it should be sloped slightly toward the existing downspout.
5 gutters typically get the 2 3 downspout so be aware that if you add 3 4 downspouts to 5 gutters it will look very odd.
You can add a downspout to your gutters with little difficulty.
On the bottom of the gutter itself take a pencil or marker and trace the outline of a sleeve.
This is the thing that connects the gutter and downspout together so it is important that it is placed correctly and securely.
It s important to think about where the most water drains out from the bottom of the existing downspout.
And keep in mind gutters have pitch to them so often adding a down at the uphill end has marginal benefit.
Gutters over flows add downspout to bring water down from roof faster.
If your gutters overflow regularly during heavy rains you may want to consider adding an extra downspout.
Watch and learn how and stop.