Garage Door Header Span

Window door garage door headers supporting roof loads only. These details are based on testing done by the engineered wood association that included only simple span headers. Notches on the outer thirds must not exceed 1 6 of the width of the board.

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To our knowledge no additional testing has been done to justify continuous headers over multiple garage door openings.

Garage door header span.

Window door garage door headers supporting roof wall floor loads. Their is no notching permitted in the center third of any beam. 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.

When in doubt use 2 by 12 inch headers. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. Measure the width of your door frame. 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.

Portal frame details within the irc specify simple span headers with a maximum finished opening width of 18.