California Residential Inspector Practice Exam

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What do the numbers in wood structural panel span rating, such as 40/20, indicate?

Maximum design load in pounds per square foot
Maximum allowable span in inches with full support
Maximum allowable span in inches with limited edge support
Maximum live load capacity during construction

The correct answer is: Maximum allowable span in inches with limited edge support

The numbers in a wood structural panel span rating, like 40/20, indicate the maximum allowable span in inches under different loading conditions with limited edge support. The first number represents the maximum span in inches that the panel can support a uniform live load, while the second number indicates the maximum span for a smaller live load with reduced edge support. For example, the '40' means that the panel can span up to 40 inches when adequately supported and loaded according to specified live load conditions. The '20' indicates that under limited edge support, such as when the panel's edges are not fully supported, the maximum span should not exceed 20 inches. Understanding this span rating is crucial for ensuring proper panel installation and structural integrity in building applications. It helps builders and inspectors determine the appropriate use of wood structural panels in different contexts, ensuring compliance with safety standards.