You should add 2 1 2 to the height of the actual door.
How to frame up french doors.
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This will give you room to space the door frame off of the sub floor.
The door frame will consist of two king studs which run the entire height of the wall frame.
Add those measurements to the size of both doors and add an additional 1 1 4 inch to obtain the final dimensions.
Now all you need to know is how to properly frame your door rough opening.
Use the long level and carpenter s square to make sure the inside of the opening is square and true.
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Remove trim carefully so you don t damage it and label the pieces as you go to make putting them back up easier.
And a horizontal header across the top of the door.
Remove the old frame around the opening with a hammer and pry bars where you want to install french doors.
Measure your door carefully and cut the opening to fit using a reciprocating saw.
After you find the width of the frame then calculate the height of the door frame.
Determine the size of the door opening.
The size of the door opening will vary depending on the size of the door you plan to install.
A typical door opening is 2 inches 5 1 cm wider than the door size being installed to allow for the thickness of the jamb material and shims to plumb the jamb.
Cut and dry fit the lumber making sure the distance between the jack studs is correct for the door casing.
Measure from the floor up and add 1 inch for the bottom and 2 inches for the top jamb.
A door jamb is 1 inch thick has an additional 1 4 inch gap.
However french doors are usually worth the extra effort for once they are up and everything is in order they make a handsome addition to your living space whether they are interior or exterior.
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.