Depending on where the old studs were placed in the pre existing wall you may need to install a few new studs.
How to plumb french doors.
Then sit the wheels of the bottom of the door back onto the track.
Tighten the screws in the hinges at the edges of the doors and at the faces.
Push the doors closed but don t latch them.
Set up a power or cordless drill with a screw tip attachment.
If the reveals around the door frame are not even we ll have to do some adjustment.
If a door has come off it s track take the edge of the top of the door and raise it a little above the track glide.
Rest the door on the glide and lift the door up over the bottom glide track.
Open both doors fully and stabilize each with a doorstop.
If the french doors are leading outside you need to insulate the wall in which the doors are placed.
Measure and cut pieces.
This will be the main alignment aid for the door installation.
Snap the door back into place.
One door is sitting higher than the other.
How to hang and finish french doors step 1.
Working on the left side of the rough door opening using a 6 or 4 level carefully draw a perfectly plumb level line all the way down the drywall roughly 1 2 from the opening.
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Draw a line down the drywall a level plumb line will be needed for the double door installation.