Installation instructions for interior prehung doors make sure.
28 inch interior door rough opening.
But since i can t find my tape measure i can t duplicate this measurement.
The rough opening size for a 24 inch interior door is 26 by 84 1 2 inches.
I can recall measuring a 30 nominal door that was actually 29 3 4.
Pre hung door is your best choice.
A 36 x 80 pre hung single door will use a rough opening of approximately 38 1 2 x 82 1 4 to fit.
When the door opens to you and the knob is on the left it is a left hand door.
First what is the real size of a door relative to its nominal size.
Check the height of the rough opening it should be 6 10.
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Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening.
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The hinge side of the rough opening is plumb 3.
The difference between a rough opening and finished opening is usually 2 3 inches.
With the actual door and frame measurement being approx 31 25 rdquo.
For reference standard interior door widths range from 24 36 finished opening.
Door the required rough opening is 32 5 rdquo.
Recommended rough opening sizes for commercial metal door frames hollow metal frames that wrap wall interior knockdown frames hollow metal frames that butt wall block or exterior wood stud nominal door size recommended opening 2 0 x 6 8 28 1 2 x 82 1 4 2 4 x 6 8 32 1 2 x 82 1 4.
28 inch 133 30 inch 131 32 inch 141 34 inch 14 36 inch 136 48 inch 30 60 inch 30 nominal door height.
Is your best option.
You have to factor in the fact that you still need to shim.
Next as i understand it the rough opening for a door jamb is exactly 2 greater than nominal with 1 on each side of the door itself.
Install a pre hung door 30 or 2 6 the rough frame door opening 32 will most likely be large enough to install a new pre hung door without having to rework the rough opening.
The head is square to the hinge side of the rough opening center the prehung unit into the rough opening bottom first.
Refer to the charts below to determine what size of door you will need.
While a standard door height is 80 finished opening.
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This takes into account the thickness of a standard 3 4 inch doorjamb on each side.
Always remember to square up your door before you nail the frame in place to assure it will close properly.
If you go with a 30 rdquo.