If you are installing a 9 wide door the opening will be 9 3 wide.
How to frame a 16 ft garage door.
Leave at least 5 of space on the sides of the door.
Leave a headroom of 14 or 12 minimum.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
Make sure the jambs are plumb by using a six foot level.
How to measure the finished width and height use of 2x4s for the sides and header.
Measure the distance from the bottom plate of the wall to a point that is 1 1 2 inches higher that the garage door height.
If you are installing a 9 wide door the opening will be 9 3 wide.
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.
Using 16 penny nails attach the jamb boards at the top and bottom.
I ll explain the process more extensively as we proceed.
Cut four 2 x 4 trimmers to this length and nail two each to either side of the rough opening.
Install the header jambs and center pad of the frame using a 2 x 6 lumber for the header jambs and center pad.