Door widths vary but an easy way to size the rough opening is to use the door width plus 5 in.
Rough opening for 24 inch french doors.
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To get the total width multiply the width of each door by 2 and add 2 inches.
Framing rough opening sizes are really quite simple.
The difference between a rough opening and finished opening is usually 2 3 inches.
Standard door rough openings.
To correctly determine the size of a rough opening for double or french doors measure the size of each door.
Make sure your door opening reinforces the wall above and on both sides of the door.
For example let s say we want to frame a 6 8 x 3 0 front entry door.
The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide.
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.
This allows for 1 2 inch thick drywall on both sides and at the top 80 inches for the doors and hardware and a 1 to 1 1 2 inch space under the door the space between the floor and the bottom of the door may vary depending on the type of flooring.
For reference standard interior door widths range from 24 36 finished opening.
This takes into account the thickness of a standard 3 4 inch doorjamb on each side.
Add 2 to 2 1 2 inch to the measurement of the door s width to determine the total width of the rough opening.
There are three simple rules to framing rough openings efficiently.
If you re going to frame a rough opening for a door then you ll need to know the unit size.
Refer to the charts below to determine what size of door you will need.
Make sure your door opening reinforces the wall above and on both sides of the door.
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You should add 2 1 2 to the height of the actual door.
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Rough opening width in 25 5 3 26 0625 336 26 5 8 26 241 rough opening height in 81 5 3 81 6.
Typically a pre hung door is measured in 30 inch and 36 inch sizes with additional sizes available in non standard widths.
Maintain a simple consistent nailing pattern.
Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.
Just add 2 to the width of the actual door size.
The rough opening should be 49 by 82 for a 48 by 80 inch door.
Getting the rough opening size right the first time will save you from frustration when installing your doors.
And avoid toenailing when possible.
As the distance between the king studs.
The required size of the finished opening for a 48 by 80 inch door is 48 by 82 inches.
Presuming the door is a 36 inch wide door the dimensions of your opening should be 37 inch wide by 81 inch tall.