Home Inspection State Practice Exam

What is the maximum allowed notch depth in a floor joist for a notch located 5 feet from the joist end?

1. 1 inch

2. 1/2 inch

3. 0 inches

4. 2 inches

The correct answer is: 0 inches

The maximum allowed notch depth in a floor joist is governed by established building codes and guidelines that prioritize the structural integrity of the joist. For a notch located 5 feet from the joist end, the depth of the notch is critical because excessive notching can weaken the joist and lead to structural failure. When a joist carries a load, its strength relies on a continuous vertical section. Notching removes material, and as such, there are stringent rules about how much can be removed. In this instance, the correct answer indicates that no notch is permitted at this location. This restriction typically applies within a specific distance from the ends of the joist, which varies by building code but is often set at 2 feet from either end for standard dimensional lumber. Allowing no notch ensures that the critical part of the joist, where bending stresses are highest, remains intact to maintain its load-bearing capacity. The presence of a notch, even if allowed at other locations, can considerably compromise the joist's strength if located too close to the ends. In contrast, notches of certain specified depths may be permissible at greater distances from the ends of the joist, but only under controlled conditions.