Frame the rough opening to 3 inches wider than the garage door size you have selected.
Sieting garage door.
If the door is 7 tall frame the opening 7 1 5.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
If you need a double garage door the typical measurement is 16 ft.
If you are installing a 9 wide door the opening will be 9 3 wide.
Garage door springs offset the weight of the door and allow it to open and close with ease.