I've got an actual opening of 35.5" in an opening between my basement and garage. I'd like to install a prehung door (first time), and am a bit confused about the width necessary for framing.
My door opening:
From what I've read I want at least 2" between the prehung door width and my rough opening -- which I don't have yet. It sounds like this limits me to either a 32" prehung (actual 33.5") or a 30" (actual 31.5").
If I went the 30" route, that would leave me 2" on each side for framing the rough opening which seems like it would leave me with the most play and be able to do something like a 2x6 (1.5") on each side, leaving me with 1/2" gap for rough opening and making the door square.
However, I'd prefer to use a wider 32" door (because why not?), but I'm not sure how to approach the framing:
The opening minus the size of the prehung door would leave me with 2" for both sides with no framing. I'm pretty sure I need to frame at least the hinge side which would be possible with a 2x6 (1.5") leaving 1/2" for making square on either side.
Is it okay to only frame one side? If not, would a 1x6 (3/4" width) be a thick enough board for framing and would the 1/4" gap rough opening be enough?