To get the total width multiply the width of each door by 2 and add 2 inches.
Rough in dimensions for french doors.
To correctly determine the size of a rough opening for double or french doors measure the size of each door.
Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.
This takes into account the thickness of a standard 3 4 inch doorjamb on each side.
If you re going to frame a rough opening for a door then you ll need to know the unit size.
Standard door rough openings.
The rough opening would be 40 1 2 x 86 1 4 for a 3 0 x 7 0 door frame.
While a standard door height is 80 finished opening.
This will give you room to space the door frame off of the sub floor.
So if each door measures 30 inches wide the width of the rough opening should be 62 inches.
Refer to the charts below to determine what size of door you will need.
For reference standard interior door widths range from 24 36 finished opening.
Getting the rough opening size right the first time will save you from frustration when installing your doors.
For example let s say we want to frame a 6 8 x 3 0 front entry door.
The difference between a rough opening and finished opening is usually 2 3 inches.
Just add 2 to the width of the actual door size.
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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.
You should add 2 1 2 to the height of the actual door.