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Interior Door Rough Opening


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#1 Charlie M

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Posted March 03 2005 - 2:54 PM

I have to frame the opening for a couple doors, but haven't ordered them yet. I was thinking that I needed a RO of 2'-8 1/2" for a 2-6" door Sound right?

#2 livetofish br

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Posted March 03 2005 - 3:09 PM

2'8-1/2" will work, you could go a little bigger for some extra shimming space if the opening is out of dimension (not square or plumb).

#3 specialist

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Posted March 03 2005 - 3:12 PM

Most prehungs have a 3/4" jamb around them. So I would add 2" to the door size to allow for shimming. For example a 30" x 80 " door I would rough at 82" x 32".. If you are rouughing it yourself make sure you square, and plumb the opening.

#4 Charlie M

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Posted March 03 2005 - 3:41 PM

I am framing it myself, so I can control that everything is plumb / level. Thanks!

#5 Stewie

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Posted March 03 2005 - 8:44 PM

Every carpenter I ever worked with does it the same way: Add 2 1/2" to width and height of door itself for rough. 2'6" 6'8" door R.O.= 2'8 1/2" X6'10 1/2" If you are working from a sub floor set the door 1 1/4" from floor if floor is already finished try for 1/2 space under unless floor is way out of level in a way that would interfere with the door's swing.
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#6 mrsunrise

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Posted March 03 2005 - 10:40 PM

As stated, mind the finish floor height. I would go 83" from there unless you are using some tiny casing. Otherwise you'll have to cut off the leg jamb ears that protrude above the head jamb. Just trying to save ya a step. With new prehungs, 2" over the door width should give enough wiggle room in the RO. You don't want to use too many shims, two opposing ones is ideal. Good luck.