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.
Non load bearing garage door header.
Section r502 5shares allowable girder and header spans.
If they are load bearing a double top plate is required.
When in doubt use 2 by 12 inch headers.
When framing in 16 centers a good rule of thumb when figuring material is one wall stud per foot of bottom plate.
Non load bearing windows and doors do not require a structural header.
Pro tip you can access a free copy of the 2012 international building code here.
A header needs a full or king wall stud on each side of the opening extending from the bottom wall plate to.
I d use a double 2x6 laid flat at the head of the opening.
The beam they have specified now is 3 1 2 x 12 x 18 9.
Most door frames that are 4 feet wide or less require a 2 by 6 header.
Framing for a non load bearing door header measure the door.
If your walls are non load bearing a single top plate is all that is required.
The load that you need to resist is the horizontal force on the wall above the new door.
The person doing the takeoff had interpreted my request for an 18 9 garage door header to the least expensive 20 long beam.
A header is to hold something up.
This is non bearing so you could use studs to create the space down from the roof or ceiling for the roll up door to roll up into.
Measure the width of your door frame.
On previous projects i have been supplied a glu lam boise makes specifically for garage door headers that was 3 1 2 x 11 1 4 x 18 9.