Carpenter Red Seal Exam Prep · Question
A blueprint indicates the structural framing requires 'Douglas Fir-Larch No. 2 grade'. According to the CSA O86, what is the specified minimum bending strength (Fb) for a 38x184 mm piece of this lumber used as a joist?
According to CSA O86 'Engineering Design in Wood', the specified minimum bending strength (Fb) for Douglas Fir-Larch No. 2 grade lumber, typically used for jois
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Question: A blueprint indicates the structural framing requires 'Douglas Fir-Larch No. 2 grade'. According to the CSA O86, what is the specified minimum bending strength (Fb) for a 38x184 mm piece of this lumber used as a joist?
Answer options: ✅ 13.5 MPa
- 12.1 MPa
- 14.5 MPa
- 11.0 MPa
Correct answer: 13.5 MPa
Explanation: According to CSA O86 'Engineering Design in Wood', the specified minimum bending strength (Fb) for Douglas Fir-Larch No. 2 grade lumber, typically used for joists, is 13.5 MPa. This value is used by engineers for structural calculations.
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