Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
Pole barn garage door rough opening.
If you are installing a 9 wide door the opening will be 9 3 wide.
The rough opening is equal to the size of the door but you need to figure back head and side room before choosing and installing the new garage door.
The doors extend beyond the finished trim you see from the front a fact that must be taken into consideration when framing and preparing the area for installation.
1 2 or 1 in one direction of the other will won t typically cause you to have to shop for a non standard garage door size.
99 of the residential garage doors that we run across are different than these widths.
The height of the rough opening would be the height of the garage door plus the thickness of whatever you are putting underneath the header in addition to the thickness of the mortar etc.
Next you will need to know your door height.