Header requirement 2 at minimum the header should be 12 wide with doubled 2 4 at opening and ceiling running the width of the door with a 2 4 in the center of the opening for the center bracket to attach to.
Garage door frame out.
Header the header is ideally a minimum 12 wide micro laminated beam that spans the width of the garage door opening.
If you are installing a 9 wide door the opening will be 9 3 wide.
Frame the rough opening to a height that is 1 5 taller than the door that you have selected.
Woodworkers prefer it because they are lightweight effortless to cut stain and hit a nail into.
By william machin a garage door jamb runs from the floor to the underside of the header at each side of the opening.
They are also rot resistant which means it will take decades to breakdown.
Cut four 2 x 4 trimmers to this length and nail two each to either side of the rough opening.
How to frame a garage doors opening in this case 9ft wide by 8ft tall.
How to measure the finished width and height use of 2x4s for the sides and header.
Pine is an excellent choice for a garage door frame.
In some designs a piece of finish lumber or trim attaches across the underside.
How to frame a garage door 1.
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.
The pale yellowish look of pine also gives it an extra edge and something to consider.