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Rough opening is an opening in a wall, or the framework of a building, into which a door frame or window frame, subframe, or rough buck is fitted.It is a measurement that a manufacture needs for installment of their component applications.
Make your rough opening 2 1/2 inches larger on the width and height.
sill opening of a wall
Rough opening are 2" wider and 2-2 1/2" taller than than the door itself. 2/8" door needs a 2/10" wide opening.
The rough opening of an interior door is two inches wider than the width of the door and two inches higher than its height. Thus your rough opening width is 38". A typical interior door has a height of 80" which would require a rough opening height of 82" but check your door to ensure that is theheight.
In most cases rough opening is 38 1/4x82 1/2.
1/2inc all around
For a 30" door, the rough opening would be 32" in width and 82" in height. Check with your local building inspection department just in case a larger door is required.
The rough opening width for a 24" door is 26-1/2" The rough opening height for a 24" door is 26-5/8" Rough openings are 2" wider and 2-1/2" taller than the actual door. This allows room for the door frame and adjustment.
Add 2 1/2" to the width and height.
Any opening in your home. ie- window frame and rough opening (use minimal expanding foam to not damage window) soffit area of roof, garage door opening, basement opening for HVAC etc...
4'1 1/2" by 4' 1 1/2"