California Residential Inspector Practice Exam

Which of the following is not an acceptable location for notches in floor joists?

1. Check the ends of the span

2. Check the supports

3. Check the middle third of the span

4. Check around duct openings

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

Notches in floor joists are critical for maintaining structural integrity and load-bearing capabilities. There are specific guidelines about where notches can be made. The correct answer highlights that notches in the middle third of the span are not acceptable. This is because the middle third of a span in a joist is where the maximum bending moment occurs due to the load being exerted on the structural element. Notching in this area compromises the strength of the joist and increases the risk of failure under load. In contrast, notches at the ends of the span or near supports can be acceptable to a certain extent, provided they adhere to specific limitations and guidelines based on the size and spacing of the joists. Additionally, notches around duct openings may be permissible when properly sized and placed according to local building codes. Thus, avoiding notching in the middle third is a fundamental rule for ensuring the adequate performance and safety of floor systems.