Cut the header from 2 x 12 lumber and to a length of the rough opening plus 6 inches.
Rough opening for 10 x 7 garage door.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
Therefore making the width of the garage door rough opening the same size as the door would be fine if you are going to use a thin layer of stucco vinyl siding or 1 by lumber.
To finish the opening cut the header and jambs from 2 lumber.
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.
If the door is 7 tall frame the opening 7 1 5.
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.
Always consider the car dimensions while designing a door opening and choosing right size of the garage door.
However if you are putting bricks thick river rock stones marble or anything else on both sides that is more than 1 thick you will want the rough opening the same.
Bigger trucks will fit in 9 x 8 doors with very few exceptions.
99 of the residential garage doors that we run across are different than these widths.
The 16 7 opening should be after the header and all the trim work is installed.
It is important to note.
Next you will need to know your door height.
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.
That for a 16 foot wide garage door the header should be at minimum 9 inches longer than the door.
Depending on your opening the lumber width will be 6 to 8 wide.
When constructing a new garage the opening for a 16 7 garage door the opening should measure 16 7.
Standard garage doors in our area are 8 9 16 and 18 wide.
Install the header on top of the trimmers and nail.
After installing the jambs your garage door opening should now be the same size as the garage door.