Coastal and Floodplain Construction Inspector's Practice Exam

What is the Fb value for a #3 Douglas Fir 2 X 4 Wood Structural panel?

1. 1000

2. 1200

3. 1400

4. 1300

The correct answer is: 1200

The Fb value, or bending stress value, for a #3 grade Douglas Fir 2 x 4 wood structural panel is typically recognized as 1200 psi. This value represents the maximum stress that the wood can withstand during bending before failure occurs. Knowing the specific Fb value is crucial for engineers and builders when designing structures, as it ensures that the material can support the anticipated loads while maintaining safety standards. The grading system for wood, including Douglas Fir, is based on various characteristics, including the strength properties of the wood. A #3 grade indicates a lower strength rating compared to higher grades, which is important for applications where cost-effective materials are required for non-structural or light structural applications. Understanding these values helps inspectors assess the suitability of materials used in construction projects related to coastal and floodplain settings. In this case, the chosen value of 1200 psi aligns with the standards typically referenced in building codes and design guidelines, making it the appropriate answer for this question.