Doors always add 5 and windows add 3 for header sizes.
What is the rough opening for a 30 inch prehung door.
The rough opening how you would frame for it for a typical prehung interior wood framed door that is listed as 30 is 32 but varies by manuf from 31 5 33 0.
The rough opening for a door is directly relational to its size.
When i frame rough openings i always go with the header sizes.
If over 6 feet windows get another trimmer each side.
Measure the opening to your door frame.
If you mean what is the dimension between the jambs it is usually 1 4 more than the door.
That is a perfect rough opening for 30 exterior door.
Use shims and or caulk to seal gaps between wall and frame.
The height is 80 which is considered 6 8 or 6 8 add 2 1 2 to the actual door height and frame it 82 1 2 high.
Of frame is 40 x 86 as the frame face is 2 around all 3 sides.
A 30 door is undersized and so will fit in a finished 30 opening.
If your door s height is 80 inches then the height of the rough opening should be 82 inches.
That s 1 for the 2 layers of rock and.
For a 3 0 x 7 0 door frame.
Rough openings for doors.
It s not practical to plan an opening that you ca.
So as you can see it would be an ideal size for your opening.
The rough framing should be 2 1 2 inches wider than the door itself.
Now all you need to know is how to properly frame your door rough opening.
A opening width 1 1 4.
I owuld love to help.
B opening height 2 1 4.
That leaves room for the 3 4 inch finish frame on each side of the door and then 1 2 inch on each side for the shims between the finish frame and the rough frame.
Let me know if you have any other questions.
Typically a pre hung door is measured in 30 inch and 36 inch sizes with additional sizes available in non standard widths.
The reason why the rough opening is 2 wider than the door is because of the door jamb on each side and the room needed to set the door.
For prehung single doors the formula is simple just add 2 for the width and 2 1 2 for the height.
The net frame size for a 30 exterior door is 31 1 2 x 81 1 2 so it leaves 1 2 on the top and both sides for your shims.
So add 6 for header.
So if each door measures 30 inches wide the width of the rough opening should be 62 inches.
Be sure to allow for about a 1 inch larger opening than the standard door sizes.
So if you have a bedroom door that is 30 wide which is considered a 2 6 or 2 6 door just add 2 to the width and frame it 32 wide.
For the height of the rough opening you need to add 2 inches to the height of the door.
If you are going to have 1 2 sheetrock jambs then you should frame the opening 31 1 4.