Together the headers king studs and trimmers act as a system that transfers weight from above down and around the window and door openings to the floor and foundation below.
How does window and door header heights work.
The next jack stud will be cut to the height of your door plus 2 1 2 and minus the thickness of the bottom plate 1 1 2 as it will rest on top of this.
The longer the distance a header spans and the heavier the load it supports the more substantial it needs to be.
This is also the top of the jack studs.
82 1 2 inches also happens to be the standard header height for windows and doors.
Make sure the window head heights are set to match the top of the door frame so the interior trim can align.
So your jack stud should be cut at 81 for a 6 8 tall door.
To align a door with an adjacent window it is important to measure the entire height of the door within the frame as the frame height will be higher than the slab size.
If you re a novice framer then this is the height of the bottom of the window and door headers.
Everyone has their little issues.
Your header size is determined by the load it carries.
Mine has to do with disparate casing heights around windows and doors in the same rooms.
How to match heights of doors and windows.
Which means the jack studs are 81 inches long typically.