Other Skilled Trades Carpentry 2 — Questions and Answers
Question 1: What is the recommended nail length for face-nailing 3/4-inch hardwood flooring?
- 1-inch nail
- 1.5-inch nail
- 2-inch nail (Correct answer)
- 2.5-inch nail
Correct answer: 2-inch nail
2-inch nails or cleats are standard for nailing down 3/4-inch solid hardwood flooring to ensure adequate penetration into the subfloor.
Question 2: Which type of subfloor material is most commonly used in modern US residential construction?
- Solid lumber planks
- Oriented strand board (OSB) (Correct answer)
- Fiberboard
- Hardboard
Correct answer: Oriented strand board (OSB)
OSB (Oriented Strand Board) has become the most common subfloor material in US residential construction due to its cost-effectiveness and structural performance.
Question 3: What is a 'bird's mouth' cut in roof framing?
- A decorative cut on rafter tails
- A notch cut in a rafter to sit on the top plate (Correct answer)
- A cut for ridge board connections
- A cut for hip rafter intersections
Correct answer: A notch cut in a rafter to sit on the top plate
A bird's mouth is an L-shaped notch cut into a rafter where it bears on the wall's top plate, providing a stable seat for the rafter.
Question 4: What does 'on center' (OC) mean in framing specifications?
- From the edge of one member to the edge of the next
- From the center of one member to the center of the next (Correct answer)
- The total span of the framing
- The depth of the framing member
Correct answer: From the center of one member to the center of the next
On center (OC) measurement refers to the distance from the center of one framing member to the center of the adjacent member.
Question 5: Which type of glue is best suited for outdoor woodworking projects exposed to moisture?
- PVA glue (white glue)
- Hide glue
- Polyurethane glue (Correct answer)
- Rubber cement
Correct answer: Polyurethane glue
Polyurethane glue is waterproof and expands as it cures, making it ideal for exterior woodworking projects exposed to weather and moisture.
Question 6: What is the minimum required header size over a 4-foot door opening in a load-bearing wall?
- (2) 2x4
- (2) 2x6
- (2) 2x8 (Correct answer)
- (2) 2x10
Correct answer: (2) 2x8
A 4-foot opening in a load-bearing wall typically requires a double 2x8 header to safely carry the loads above the opening.
Other Skilled Trades Carpentry 2
What is the recommended nail length for face-nailing 3/4-inch hardwood flooring?