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.
Rough opening for 8 x 16 garage door.
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.
Standard garage doors in our area are 8 9 16 and 18 wide.
For instance if the width of the garage door is 8ft the rough opening should be 8ft 3 inches wide.
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.
Next you will need to know your door height.
99 of the residential garage doors that we run across are different than these widths.
This guide is intended primarily for our builder customers to explain in detail the measurements and condition we need the work site to be in to properly co.
Step 1 measure the old door if you are replacing an existing door with one of the same size or the new door of choice if you are building a new garage.
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.