The door frame is screwed to the jambs through shims. The screws are then concealed with PVC trim, which is supplied with a custom door and can be bought separately in the case of a standard door. Standard doors can also be installed without this PVC trim and the screw heads concealed with wood plugs.
4.1. Remove the strip at the back of the brick moulding, unless new vinyl siding is being installed at the same time as the door.
4.2. Run two or three beads of caulk along the threshold of the opening.
4.3. Place the bottom of the door frame on the threshold, then tilt the door into the opening until the brick moulding rests up against the house.
If the door does not have brick moulding, the outer edge of the frame must be flush with the lath under the siding (for vinyl siding) or positioned along the line left on the brick by the old door.
4.4. Insert shims from the inside between the door frame and jambs to adjust the frame and ensure that it is centred, square, level and plumb.
Insert shims in line with the holes drilled previously and position others every 12?, but always at least 8? from the corners. If shims are needed under the threshold, space them 8? from one another. Constantly check that the frame is level and square. Use enough shims to support the frame but not so many as to force it, which may cause it to bow.
4.5. Measure the two diagonals of the door frame.
These measurements must be identical (not exceeding 1/8? difference). The frame must also be level, both horizontally and vertically (plumb). Up to 1/16? of deviation is acceptable. Make any necessary adjustments.
4.6. Screw the sides of the door frame to the jambs, through the shims.
Do not screw the head or the sill.
4.7. Cover the thickness of wall not covered by the door frame.
- For a standard door: measure the distance between the edge of the frame and the interior wall surface. Make an extension jamb “archway” so that the door frame arrives level with the drywall surface. Distance less than 2 ½”: nail it (using finishing nails) directly around the frame edge. Distance more than 2 ½”: position the extension using shims, then nail to the jambs. This extension will be hidden by the PVC trim.
- For a custom door: the frame width should cover the entire thickness of the wall.
4.8. Cut off the ends of the shims with a tenon or flush-cutting saw.
4.9. Insert fibreglass insulation around the edge of the frame.
Push it in with a shim or similar implement, but avoid compressing it. Fill all the space with continuous layers of insulation (not small pieces inserted separately).
Note: Polyurethane foam insulation can be used, but this technique requires experience, since too much of this product can exert pressure on the frame and deform it.
4.10. If shims were installed under the threshold, caulk the gaps between them.
4.11. Fit the sliding door into the frame and check that it glides well and is parallel to the frame sides.
4.12. Adjust the rollers under the sliding panel if necessary.