A notch made at the end of a floor joist should not exceed what fraction of the depth of the joist?

The correct answer is that a notch made at the end of a floor joist should not exceed one-quarter of the depth of the joist. This guideline is critical for maintaining the structural integrity and strength of the joist. Notching can weaken a joist significantly, as it removes material that contributes to its load-bearing capacity.

If the notch exceeds one-quarter of the joist’s depth, it can lead to increased stress concentration at the notch, making the joist more susceptible to cracking or failure under load. Understanding these limits is important for compliance with building codes and ensuring safety in residential construction. By adhering to this guideline, contractors can create durable and reliable flooring systems.