Jack up the centre of the trusses then reinforce each bottom chord with a 2x4 that spans the entire width of the garage.
Garage door header truss.
The garage door opener mounting bracket also called the header bracket secures the carriage tube to the wall above the door.
The exact location depends on the type of door.
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Most residential garage doors attach to the vertical jambs of the door so any wind loading will not be seen by the header but by the jambs which is picked up by the king studs at the sides of the door.
Then i would run the 5 8 sheetrock firewall up the house wall lid over the 10 and then drywall the truss.
The truss will put a little bit of weight on it but not a whole lot the majority of the weight will be split evenly by the two side walls the truss company will size the trusses i would use a dropped truss for the gable end it will make framing easier and stronger than building a barge.
In an attempt to construct portal frames some garages are built with one continuous garage header extending over two or three garage door openings as shown in figure a.
However this is assuming that the pony wall above the header is non existent or relatively short.
Garage door header depth in reference to the structure truss above i had a wierd situation which i wanted to set a gable end truss in 10 from the house wall and then build a gable wall on the house 22 10 garage.
Set it securely on top of a stepladder so it s conveniently close to the ceiling.
Lift the power unit.
4mount the header bracket.