For example let s say we want to frame a 6 8 x 3 0 front entry door.
Rough door opening in concrete wall.
Room to adjust the door and the frame in the opening.
Using a 3070 door as an example the rough opening size for a kd cased open frame would be 38 x 85.
As the distance between the king studs.
Rough opening size welded frame.
Frames that butt wall block or exterior wood stud a opening width 4 1 2 b opening height 2 1 4 the rough opening would be 40 1 2 x 86 1 4 for a 3 0 x 7 0 door frame.
Not all rough openings are completely plumb and square.
Use shims and or caulk to seal gaps between wall and frame.
Take the nominal door width and add 4 1 4 and the nominal door height and add 2 1 4.
Therefore the rough opening would be 82 1 2 tall by 38 1 2 wide.
The 6 8 stands for 6 8 tall and the 3 0 stands for 3 0 wide.
In this example the total we will use is 99 96 door height plus 1 1 4 for the top rough opening and 1 3 4 for the bottom rough opening.
There are three simple rules to framing rough openings efficiently.
Why does the opening need to be bigger than the door and its frame.
And avoid toenailing when possible.
Of frame is 40 x 86 as the frame face is 2 around all 3 sides.
If you re going to frame a rough opening for a door then you ll need to know the unit size.
Door widths vary but an easy way to size the rough opening is to use the door width plus 5 in.
Maintain a simple consistent nailing pattern.
Standard door rough openings.