Having never installed a pre-hung door before, I am wondering how accurate does the door rough-in need to be? I am planning on installing a 28" bathroom door, which has a 30" rough in. After framing it up, (and I can't figure out exactly how this happened as the bottom gap is 30" and the two Jack studs appear to be level) I noticed that the gap at the top is closer to 29 13/16" instead of 30". Is this a problem?
Doors – How accurate does a door rough-in need to be
door-framedoorsframingrough-in
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Best Answer
Generally for interior doors the RO (Rough Opening) is 2 inches wider than the door slab. This gives 3/4" for the jamb and 1/4" of 'play' for each side, for you to adjust the jamb to make the door operate properly. So if you've got 29 13/16 instead of 30, you'll end up with a little over 1/4 of play total instead of 1/2. Still should be plenty if your jacks are fairly plumb.
If you run into trouble and find you need the extra space, a couple of good swings with a hammer at the jack should get you another 1/8 or so.
Don't worry about the jacks being slightly out. Here's what you do: