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.
Ruff opening for a 10 ft 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.
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.
99 of the residential garage doors that we run across are different than these widths.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
Standard garage doors in our area are 8 9 16 and 18 wide.
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.
If the door is 7 tall frame the opening 7 1 5.
Frame the rough opening for the garage door to 3 inches wider than the garage door you have selected.
Next you will need to know your door height.
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.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
It should be obvious that you don t use twice the thickness for the height since you will not be putting anything on the floor but you have been reminded just in case this thought escaped you at the moment.
If it s 9ft the opening must be 9ft 3 inches and so on.
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.
Cut four 2 x 4 trimmers to this length and nail two each to either side of the rough opening.
For instance if the width of the garage door is 8ft the rough opening should be 8ft 3 inches wide.