Width of garage door opening standard widths are 8 9 10 12 14 16 17 and 18 height of the garage door opening standard residential heights are 7 7 6 8 header the header is ideally a minimum 12 wide micro laminated beam that spans the width of the garage door opening.
Rough opening for 8 x 16 garage door.
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.
Width of rough opening the width of the rough opening should be 3 inches greater than the width of the garage door you are purchasing.
If it s 9ft the opening must be 9ft 3 inches and so on.
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.
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.
For instance if the width of the garage door is 8ft the rough opening should be 8ft 3 inches wide.
Next you will need to know your door height.
For instance if you have a 16 door and are using river stones that are approximately 2 to 2 1 2 you will want the rough opening to be roughly pun intended 16 6.