The rough opening would be 40 1 2 x 86 1 4 for a 3 0 x 7 0 door frame.
Rough in dimensions for french doors.
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Of frame is 40 x 86 as the frame face is 2 around all 3 sides.
The difference between a rough opening and finished opening is usually 2 3 inches.
Refer to the charts below to determine what size of door you will need.
To correctly determine the size of a rough opening for double or french doors measure the size of each door.
Just add 2 to the width of the actual door size.
This will give you room to space the door frame off of the sub floor.
This takes into account the thickness of a standard 3 4 inch doorjamb on each side.
Standard door rough openings.
Framing rough opening sizes are really quite simple.
While a standard door height is 80 finished opening.
So if each door measures 30 inches wide the width of the rough opening should be 62 inches.
Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.
For reference standard interior door widths range from 24 36 finished opening.
To get the total width multiply the width of each door by 2 and add 2 inches.
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.
You should add 2 1 2 to the height of the actual door.