The procedure for constructing a header for 6 inch exterior wall framing can be modified for any wall thickness.
Size garage door header.
Measure the width of your door frame.
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.
The standard size for double garage doors is 16 feet wide and 7 to 8 feet high.
Window door garage door headers supporting roof wall floor loads.
If there isn t enough room above the opening this can t be done without raising the roof of the garage.
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.
Many home builders do not consider this a structural necessity but a style and price choice for the homeowner.
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.
Window door garage door headers supporting roof loads only.
Garage door header size calculator posted on october 29 2019 by bandi ruma wood beam design and installation no headers in nonbearing walls code notes window headers and door garage door header size headroom door frame and calculation.
When in doubt use 2 by 12 inch headers.
Most door frames that are 4 feet wide or less require a 2 by 6 header.