Their is no notching permitted in the center third of any beam.
Garage door header span.
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.
When in doubt use 2 by 12 inch headers.
To our knowledge no additional testing has been done to justify continuous headers over multiple garage door openings.
Window door garage door headers supporting roof loads only.
Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts.
Notches on the outer thirds must not exceed 1 6 of the width of the board.
Measure the width of your door frame.
Most door frames that are 4 feet wide or less require a 2 by 6 header.
Between 4 and 5 feet the header should be built 2 inches wide and 8 inches long while a larger opening needs a header that is 2 by 12.