Since the 70's, I've framed (or had framed) door rough openings 2-1/2" over. But jamb stock seems to have evolved from a full 3/4" to 5/8" thick or even less nowadays. Thinking of going to only 2" over. What are your practices?
Are you saying a 2'-8" door isn't always exactly 32" wide in your area? That thought never occurred to me. I can understand with windows - they're either actual or 1/2" under callout depending on the manufacturer.
Likewise, learned at 2 1/2" and like it that way. This gives plenty of leeway to make the fit perfect plumb and shift to desired centering. Of course, we use mostly wider casings, 3 1/2" or larger, so the gap is always well covered.
Our interior doors get framed door size plus 2 1/4. Our suppliers doors are a full 36 or 32 plus reveal and they still use 3/4 jambs so 2 inch over gets a little tight at time. For exterior doors typically they are 2 1/4 over also per the ro specs from manufacturer.
I guess I should have prefaced my question with a recent experience with some volunteer work for H4H. I was assigned to hang six doors in the three bedrooms. The casing was the tiniest stuff I've ever seen - 1-13/16" wide.
In GENERAL.....2". Exterior doors I go 1/2" wider, double doors 2-1/2, bypass actual to + 1 depending on the casing. 2-1/2 on the height every time. Lots of other variables like handicap accessible.
If they are real good 2" is enough.
I used to do 2 1/4, but since I started doing trim behind my framing ,I have cut it down to 2"
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