Buy the replacement door.
How to build exterior french door frame.
Measure from the floor up and add 1 inch for the bottom and 2 inches for the top jamb.
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 are fitting french doors to what was an original wall or single door prepare the door frames and lintels beforehand.
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.
Buy an unfinished french door frame or two single doors with pre cut centerpieces from your local lumber store.
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Building frame panel french doors.
After you find the width of the frame then calculate the height of the door frame.
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.
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.
The key to this project is a new router bit set designed expressly for french doors.
5 x research source you will need to add 1 2 of plywood between the 2x4 s to get the right wall thickness of 3 1 2.
Measure the door frame to make sure the new doors will fit.
Measure the door frame.
Add those measurements to the size of both doors and add an additional 1 1 4 inch to obtain the final dimensions.
And for the greatest stability a major requirement for entry doors i decided to make the stiles and rails using stave construction a building method commonly used by exterior door manufacturers rather than solid lumber.
Building frame panel french doors in this video i make a set of custom frame panel french doors for my shop.