CLC Finish Carpentry & Trim Work 2 — Questions and Answers
Question 1: When installing crown molding on an out-of-plumb wall, which adjustment technique is most appropriate?
- Scribe the back of the molding to match the wall angle
- Add shims behind the molding at regular intervals
- Spring the molding angle and adjust the miter cuts accordingly (Correct answer)
- Use flexible adhesive to compensate for the gap
Correct answer: Spring the molding angle and adjust the miter cuts accordingly
Adjusting the spring angle and recalculating miter cuts accommodates out-of-plumb walls while maintaining a tight fit at corners.
Question 2: What is the standard reveal on a door casing where it meets the door jamb?
- 1/16 inch
- 1/8 inch
- 3/16 inch (Correct answer)
- 1/4 inch
Correct answer: 3/16 inch
A 3/16-inch reveal is the industry standard setback from the edge of the jamb, providing a consistent shadow line around the door opening.
Question 3: Which saw setup produces the most accurate coped joint for inside corners of baseboard?
- Table saw with a dado blade
- Jigsaw with a fine-tooth blade
- Miter saw cut at 45° followed by a coping saw (Correct answer)
- Oscillating tool with a flush-cut blade
Correct answer: Miter saw cut at 45° followed by a coping saw
A 45° miter saw cut exposes the profile, which is then back-cut with a coping saw to create a coped joint that overlaps the first piece.
Question 4: When installing wainscoting panels, what is the correct sequence of installation?
- Cap rail, panels, chair rail, base
- Base, panels, chair rail, cap rail (Correct answer)
- Panels, base, cap rail, chair rail
- Chair rail, base, panels, cap rail
Correct answer: Base, panels, chair rail, cap rail
Installing the base first establishes the bottom reference, panels are fit to it, and the chair rail or cap rail finishes the top edge.
Question 5: What causes a mitered outside corner on base molding to open up (gap) after installation?
- Using too much adhesive behind the molding
- Wood shrinkage as the moisture content decreases (Correct answer)
- Installing the base before the flooring
- Using nails instead of screws for fastening
Correct answer: Wood shrinkage as the moisture content decreases
As lumber dries and loses moisture, it shrinks across the grain, causing mitered outside corners to open over time.
Question 6: When fitting a door casing around a rough masonry opening, which profile is typically used first?
- Ogee profile
- Backband profile
- Brick molding (Correct answer)
- Chair rail profile
Correct answer: Brick molding
Brick molding is designed with a rabbet that overlaps the window or door frame and bridges the transition to masonry or siding.
Question 7: What is the primary purpose of a backer block (rosette) at the corner of a door casing?
- To reinforce the wall framing behind the casing
- To eliminate the need for mitered or coped corner joints (Correct answer)
- To provide additional nailing surface for the casing
- To conceal the gap between the jamb and rough opening
Correct answer: To eliminate the need for mitered or coped corner joints
Rosette or plinth blocks allow horizontal and vertical casings to meet at a square-cut butt joint, eliminating difficult miter or cope work.
CLC Finish Carpentry & Trim Work 2
When installing crown molding on an out-of-plumb wall, which adjustment technique is most appropriate?