If your home has vinyl gutters follow these steps about how to join gutter sections.
Connecting gutter sections.
How to connect two sections of gutters.
On the ground assemble the gutter pieces and overlap the sections by 3 to 4 inches.
Make sure that the top edge of each overlapping piece is pointed in the direction of the water flow.
Measure the total run of the gutter length you need.
Now you can install the gutters.
Connect the overlapping areas along the sides of the gutters with pop rivets or sheet metal screws.
If you have a straight run gable roof measure from shingle to shingle and then add.
Spread gutter sealant on the overlapping areas.
If you have a straight run gable roof measure from shingle to shingle and then add 1 2 inch to each side.
The first gutter piece and maybe the second and even a third piece will likely be full 10 ft.