Florida Building Code Practice Exam

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If floor joists are notched, where should the notches be located?

Near the ends of the joist
In the middle third of the span
In the last quarter of the span
Any position is acceptable

The correct answer is: In the middle third of the span

The correct answer centers on maintaining the structural integrity of the floor joists. Notching floor joists helps accommodate piping, electrical conduits, or other installations. However, the placement of these notches is crucial to ensure the joists can effectively support loads without compromising strength. Positioning notches in the middle third of the span is ideal because this area experiences the least amount of bending stress and allows the joists to retain the greatest amount of strength. Bending moments are highest near the supports (the ends of the joists), so notching in those areas can lead to failure due to increased stress concentrations. By following this guideline, builders ensure that the floor system remains safe and functional, which aligns with best practices outlined in the building codes. Properly locating notches not only contributes to structural safety but also complies with the requirements established by the Florida Building Code.