Garage Door Header

I m re doing my plans for resubmittal.
Garage door header. This piece of. Garage door header size i m building a 3 car garage and it now looks like i ll have to have 1 9 door and 1 16 door instead of 3 9 doors. That would take care of the wind and seismic shear loads. Cut a 2 x 6 piece of lumber and nail to the face of wall exactly in the center of the garage header.
Would like opinions on the size of header beam needed for a 10 wide garage door on the gable end of the building. Standard systems require 10 inches of headroom while some require 12 inches while garage door openers often require an additional three inches of clearance. 16 garage door headers the garage and other window and door openings are prescriptive see figure r602 10 6 2 alternate braced wall panel adjacent to a door or window opening a minimum 3 x 11 25 net header size is required for opening from 6ft to a maximum 18 ft. What size type header do i need for the 16 opening.
The garage door header is the large piece of wood at the top of the garage which supports the roof of the garage and any living space above it. If you notice that your garage door header is starting to sag or has developed cracks then you may have a serious structural problem. Last pull a measurement from the top of the 2 x 6 piece of lumber that you just installed to the ceiling of the garage. The best way to fix this problem is to replace the header.
Attach lumber to the face of the garage wall to the edge of the garage door header. The header for a door is much like a bridge transferring the weight above it to the floor and foundation below. Due i need a solid engineered beam or can i sandwich 2 lvl s or microlams together. Measure the head room the distance between the top of the door opening or door jamb header and the ceiling of the garage.
Doors in a load bearing wall that holds the weight of the house created by beams and trusses need a larger header than those in non load bearing walls.