When building a door jamb to fit a standard wall with a two by four frame and 1 2 inch drywall on each side the width of the jamb board typically is 4 9 16 inches.
How to build exterior french door frame.
If you are fitting french doors to what was an original wall or single door prepare the door frames and lintels beforehand.
Measure the door frame.
A door jamb is 1 inch thick has an additional 1 4 inch gap.
The key to this project is a new router bit set designed expressly for french doors.
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Buy an unfinished french door frame or two single doors with pre cut centerpieces from your local lumber store.
Framing for a french door is similar to framing for a single door except there are two doors and each door will be hung one on each side of the opening.
Buy the replacement door.
Building frame panel french doors.
Add those measurements to the size of both doors and add an additional 1 1 4 inch to obtain the final dimensions.
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.
Measure the door frame to make sure the new doors will fit.
Measure from the floor up and add 1 inch for the bottom and 2 inches for the top jamb.
To make the door header the top of the door frame cut two 2x4s to the same length as the width of the original opening and nail them securely together.
After you find the width of the frame then calculate the height of the door frame.
I love the arts crafts style furniture so i picked some simple doors to practice so one day i can tackle my front door.
If you re not using premade jamb material or if your walls are a nonstandard thickness you can buy 5 or 6 inch wide lumber and rip cut it to the width of the wall using a table saw.