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Interior door rough opening size chart.
While a standard door height is 80 finished opening.
For fire rated openings drywall must extend at least 1 2 into frame.
For reference standard interior door widths range from 24 36 finished opening.
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.
The standard height of the rough opening for a door is the door height plus 2 5 8 inches.
Interior knockdown frames that wrap wall a opening width 2 b opening height 1 the rough opening would be 38 x 85 for a 3 0 x 7 0 door frame.
You should add 2 1 2 to the height of the actual door.
The additional room allows for a 3 4 inch top jamb a shim.
Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.
The height of common doors is 6 feet 8 inches.
For example let s say we want to frame a 6 8 x 3 0 front entry door.
Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening.
The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide.
If you re going to frame a rough opening for a door then you ll need to know the unit size.
Framing rough opening sizes are really quite simple.
Refer to the charts below to determine what size of door you will need.
Standard door rough openings.