Finish Carpentry and Joinery
Finish carpentry and joinery tests the fit and appearance of doors, windows, trim, cabinets, stairs, and joints, plus the discipline needed to protect completed work.
Core rules
- Check openings and substrates before installation; correct framing errors before fitting trim.
- Acclimate interior wood and sheet goods to the room conditions.
- Use a test fit, then cut and adjust; do not force joints.
- Set doors plumb, level, and square with consistent reveals and specified clearance.
- Join trim with miters, copes, or scribes appropriate to the profile and movement.
- Predrill near edges, set fasteners consistently, and fill and sand without damaging grain.
- Protect installed work from traffic, moisture, and other trades.
Worked example
A door binds at the top latch side. You check the jamb for plumb, the head for level, and the door for square. You find the hinge jamb out of plumb, so you adjust the jamb and reset the hinges rather than planing the door wildly. Reasoning: planing removes material permanently; correcting the jamb restores the intended reveal and swing.
Traps
- Over-driving nails and crushing trim.
- Ignoring grain direction when planing or sanding.
- Installing cabinets before checking wall flatness.
- Leaving no expansion gap at floors or walls.
The exam looks for fit, function, and protection of finished surfaces.