10 Garage Door Header Size

Header spans for exterior walls on buildings 20 wide.
10 garage door header size. Would like opinions on the size of header beam needed for a 10 wide garage door on the gable end of the building. Roof ceiling 6 10 1 8 5 2 9 9 2 10 6 1 12 2 2 14 1 1 roof ceiling center bearing floor. Measure the width of your door frame. Standard systems require 10 inches of headroom while some require 12 inches while garage door openers often require an additional three inches of clearance.
Building a structural header for a garage door opening can be handled on the jobsite and will offer the same structural support as more expensive solid wood beams. Most door frames that are 4 feet wide or less require a 2 by 6 header. I framed my basement when finishing it but nothing this wide. Measure the backroom the distance from the garage door.
Header the header is ideally a minimum 12 wide micro laminated beam that spans the width of the garage door opening. Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications. Number of plies and jacks in 2 2 x 8 2 2 x 10 2 2 x 12 3 2 x 10 3 2 x 12 4 2 x 12. 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.
I am wanting to add a divider wall in my garage to separate a work space from the parking area. The procedure for constructing a header for 6 inch exterior wall framing can be modified for any wall thickness. When in doubt use 2 by 12 inch headers. Window door garage door headers supporting roof wall floor loads.
Since there is very little weight on this end my thoughts are 2 2x8 s. Window door garage door headers supporting roof loads only. All documentation i have found on header sizing refers to load bearing walls.