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Carpenter Red Seal Exam Prep · Question

A carpenter is installing baseboard trim in a room with an inside corner where two walls meet. What is the most widely accepted and durable method for joining two pieces of baseboard at this corner?

A coping joint is the most effective and durable method for inside corners with trim. It allows one piece of trim to butt squarely against the wall, while the s

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Question: A carpenter is installing baseboard trim in a room with an inside corner where two walls meet. What is the most widely accepted and durable method for joining two pieces of baseboard at this corner?

Answer options:

  • A simple butt joint.
  • A 45-degree mitre joint. ✅ A coping joint.
  • A scarf joint.

Correct answer: A coping joint.

Explanation: A coping joint is the most effective and durable method for inside corners with trim. It allows one piece of trim to butt squarely against the wall, while the second piece is cut to precisely scribe the profile of the first, accommodating slight imperfections in the corner angle without opening up over time due to seasonal movement. Mitre joints are prone to opening at inside corners.

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