I am replacing a 36-inch exterior door with a double door, 6 feet wide. It is going into a studded ground floor wall. There is another story above it. House is 24 feet wide.
Assuming I am reading the right table, and reading the table right...
Table R502.5(2) says I use 3 2x8s to span a max of 6' 3" with one jack stud at either end.
Since it is a 2x6 wall, I plan to laminate in some plywood to make the header wide enough.
And then, when I remove the existing door, its frame and header, do I really need to use jacks, etc., or can I just screw a 2x10x8 to the studs on both sides of the new opening while I work?