French Door Installation1. There may be skid boards or other framing attached to protect the system during transit. Remove any protective materials; if the unit has clips to keep the door aligned and closed, do not remove those.
2. Adjust the unit so the face is plumb, then secure one hinge jamb temporarily with a 3" drywall screw placed about 6" below the head jamb. Leave a small gap between the jamb and the wall stud.
3. Use a level and a straightedge to make sure the head jamb is level and straight across the entire width of the unit. Shim under the sill directly below either hinge jamb if necessary. Insert shims directly behind the top hinges on both sides, taking care not to drive the shims in too hard (you don't want to bow the jamb). Drive two 3" drywall screws just above the top hinges on both sides.
4. Check the gap between the doors and the head jamb to make sure it is even across the entire width of the unit. If not, the unit is out of square.
5. Once the unit is square and level, shim behind the center and bottom hinges on both hinge jambs. Secure the hinge jamb with two 3" drywall screws just above the center and bottom hinges. Remove any prehanging clips or braces and test both doors to make sure they operate properly.
6. From inside the house, stuff fiberglass insulation into the gap between the door jamb and the wall framing. Make it snug, but do not stuff it in too tightly. Nail the brick mold 16" on center outside, and install the interior casing.
7. On the outside, caulk around the outside of the brick mold where it meets the siding. Finish the door according to the manufacturer's instructions.
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