Can't remember ... it's been so long. I will be installing a pre-hung
I found this link useful when I was looking for the same information:
Usually the door will have the rough opening dimensions on it when you buy it. I think the norm is 1 1/2" wider than the door, and 3/4" taller, but confirm this when you buy it.
2-1/2" wider and taller than the nominal door size. For a standard 2'-8" x 6'-8" door, the rough opening is 34-1/2" wide by 6'-10-1/2" tall.
On a nonbearing wall, a 2x4 header is fine. I usually use
2x6, just to be sure. You never know, for sure, if the wall will become loadbearing due to future projects, or storage of heavy items above.
I just measure the prehung door. I do not use the measurements supplied by the manufacturer, I think they are way too big for my tastes, I go about 3/4 to one inch larger than the outside measurement.. I attach directly, w/o shims, on the hinge side (Ensure jack stud is perfect first) then just shim on the opposite side. Works for me.
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