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