Carpenter Red Seal Exam Prep · Question
What is the function of a 'bird's mouth' cut in a common rafter?
A bird's mouth cut is a notch made in a rafter to allow it to sit securely and level on the top plate of an exterior wall, providing adequate bearing area.
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Question: What is the function of a 'bird's mouth' cut in a common rafter?
Answer options:
- To create an aesthetic detail for exposed rafter tails ✅ To provide a level bearing surface on the top plate of the wall
- To facilitate the installation of insulation between rafters
- To connect the rafter to the ridge board with a stronger joint
Correct answer: To provide a level bearing surface on the top plate of the wall
Explanation: A bird's mouth cut is a notch made in a rafter to allow it to sit securely and level on the top plate of an exterior wall, providing adequate bearing area.
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