Header the header is ideally a minimum 12 wide micro laminated beam that spans the width of the garage door opening.
Making a garage door header.
This piece of lumber will be used to attach the center bracket of your garage door spring assembly.
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.
The king studs nailed into the end of each header and the trimmers that butt just under the header combine to create a sturdy vertical support column.
When in doubt use 2 by 12 inch headers.
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.
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Click on the image below for clear detail and drawing.
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.
Danny talks about how to build headers for doors and windows.
Most door frames that are 4 feet wide or less require a 2 by 6 header.
The procedure for constructing a header for 6 inch exterior wall framing can be modified for any wall thickness.
Cut a 2 x 6 piece of lumber and nail to the face of wall exactly in the center of the garage header.
Measure the width of your door frame.