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.
Garage door frame out.
In some designs a piece of finish lumber or trim attaches across the underside.
How to measure the finished width and height use of 2x4s for the sides and header.
By william machin a garage door jamb runs from the floor to the underside of the header at each side of the opening.
How to frame a garage door 1.
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.
If you are installing a 9 wide door the opening will be 9 3 wide.
Pine is an excellent choice for a garage door frame.
Frame the rough opening to 3 inches wider than the garage door size you have selected.
If the door is 7 tall frame the opening 7 1 5.
Header the header is ideally a minimum 12 wide micro laminated beam that spans the width of the garage door opening.
Woodworkers prefer it because they are lightweight effortless to cut stain and hit a nail into.
They are also rot resistant which means it will take decades to breakdown.
How to frame a garage doors opening in this case 9ft wide by 8ft tall.
Frame the rough opening for the garage door to 3 inches wider than the garage door you have selected.