Window door garage door headers supporting roof wall floor loads.
Garage door header span.
Notches on the outer thirds must not exceed 1 6 of the width of the board.
Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts.
When in doubt use 2 by 12 inch headers.
Their is no notching permitted in the center third of any beam.
Measure the width of your door frame.
These details are based on testing done by the engineered wood association that included only simple span headers.
Most door frames that are 4 feet wide or less require a 2 by 6 header.
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.
To our knowledge no additional testing has been done to justify continuous headers over multiple garage door openings.