If you need a double garage door the typical measurement is 16 ft.
Sieting garage door.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
If you are installing a 9 wide door the opening will be 9 3 wide.
There is no standard garage door size.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
A problem with the spring tension could cause the door to open or close unevenly improperly or at the wrong speed and adjusting the springs will likely solve the problem.