California Residential Inspector Practice Exam

Where should notches not be located in solid lumber floor joists?

1. At the ends of the span

2. In the middle third of the span

3. In the first quarter of the span

4. In the last third of the span

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

Notches in solid lumber floor joists should not be located in the middle third of the span because this area experiences the greatest amount of stress and bending forces during loading. The middle third represents the portion of the joist where the maximum deflection and tension are likely to occur, making it critical for structural integrity. Introducing notches in this area can significantly weaken the joist, as it reduces the effective structural material that resists these forces. Properly maintaining solid lumber with no notches in the middle third plays a crucial role in ensuring that the joist can carry its intended load without risking structural failures, excessive sagging, or potential collapse. The other locations mentioned may allow for some degree of notching, provided that proper guidelines are followed to maintain sufficient structural soundness in those areas. This underscores the importance of adhering to best practices in construction to ensure the durability and safety of the structure.