Mark the exact location of the opening on the bottom plate.
How to frame a prehung french door.
To construct a header cut two pieces of 2x6 or larger to the width of the rough opening plus 3 inches to allow for the thickness of the two jack studs.
How to install exterior and interior french doors in a existing opening step 1.
Caulk the lower edges of each side jamb where they meet the top of the threshold with exterior.
Working on the floor stack the pieces with the crowns facing the same direction see next step and use a square to make sure they are aligned.
Cut 1 2 inch plywood spacers.
Use a carpenter s square and pencil to place two marks that are exactly 88 inches apart.
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Cut off the lower ends of the side jambs on the door frame to fit atop each end of the threshold.
Provided the wall in which the door is to be installed is not a support wall for the roof cut the door opening in the 2x4 frame after the wall is built.
Step one plan the opening.
Measure the dimensions along the outside of the pre fabricated frame that encloses the pre hung door.