Massachusetts Construction Supervisor License (CSL) Practice Test

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What is the maximum allowed span of a 2x10 floor joist, #2 grade Hem-Fir lumber spaced 16 inches on center in a bedroom in a single family dwelling?

19 ft 6 in.
17 ft 3 in.
14 ft 3 in.
16 ft 10 in.

The correct answer is: 16 ft 10 in.

The correct answer is 16 ft 10 in. This value is derived from the National Design Specification (NDS) for Wood Construction, which establishes guidelines for various types of lumber, including their spans based on specific conditions. In the case of a 2x10 floor joist made from #2 grade Hem-Fir lumber, the maximum allowable span is determined by the load it is expected to carry, the spacing between the joists, and the application type, which includes factors such as live load, dead load, and use category. For a single-family dwelling, particularly in a bedroom where the expected live load is typically around 40 pounds per square foot, the span of 16 ft 10 in. is the maximum that can be safely used, ensuring adequate structural integrity without excessive deflection or risk of failure. This maximum span provides both safety and performance within the expected usage patterns in a residential setting. Choosing spans that exceed these limits may lead to structural issues, including sagging or even failure under load, thus it is essential to adhere to established guidelines for material properties and structural requirements in construction.