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Carpentry Level 3 Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What is the maximum spacing allowed between balusters on a residential guardrail in BC?✔✔ 4 inches (100 mm)
What is the minimum headroom required above stair treads in residential construction?✔✔ 6 feet 6 inches (1980 mm)
What is a “dead load” in building construction?✔✔ The weight of the permanent parts of the structure
What is a “live load”?✔✔ The weight of movable objects and occupants on a structure
What is the recommended nail spacing for fastening subfloor to joists using glue and nails?✔✔ 6 inches on edges, 12 inches in the field
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What is the purpose of a weep hole in masonry or cladding?✔✔ To allow water to drain out from behind the wall system
What is the correct sequence for installing a window in wood-frame construction?✔✔ Flashing membrane, window, caulking, and trim
What is a “birdsmouth” in roof framing?✔✔ A notch cut into a rafter to seat it on the top plate
Why is diagonal bracing used in framed walls?✔✔ To resist racking and maintain wall alignment
What is the maximum riser height allowed for residential stairs in BC?✔✔ 7 7/8 inches (200 mm)
What is the minimum tread depth allowed for residential stairs in BC?✔✔ 10 inches (255 mm)
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What is the purpose of a fire-rated wall?✔✔ To prevent the spread of fire between building sections
What is a “rough opening” in carpentry?✔✔ The framed opening required to install a window or door
What does “O.C.” mean on carpentry blueprints?✔✔ On center (measuring from center of one member to the next)
Why must you install metal joist hangers properly with all specified fasteners?✔✔ To ensure full structural load capacity is achieved
What does "kick-out flashing" do on a roof?✔✔ Diverts water away from wall intersections to protect cladding
Why are control joints placed in concrete slabs?✔✔ To reduce random cracking due to shrinkage and movement
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