The following lines were added (+) and removed (-):
* Measure and cut two jack studs (studs that do not run the full height of the floor, used to support heavier framing at both sides of a door, window, or other opening) so they are 1 and 3/4 inches longer than the height of the door.* Measure and cut two jack studs (studs that do not run the full height of the floor to ceiling, used to support heavier framing at both sides of a door, window, or other opening) so they are 1 and 3/4 inches longer than the height of the door. A jack stud is a partial stud nailed next to full studs to support the header at the door opening. The first studs on either side, the jack studs, go only as high as the rough opening of the doorway. On top of those go a double header. * Nail the jack studs to the frame studs with 8d nails placed one foot apart from top to bottom. * Cut two 2x4s each 35 and 1/2 inches long (for a 30-inch door) and nail them together. Place this double header on top of the jack studs. Secure them by driving two 16d nails through each side of the door frame studs. * Measure the opening between the top of the header and the top plate, and cut three cripple studs. Nail one against each frame stud, and center the third over the door opening.