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The maximum depth for a notch at the end of a joist can be what fraction of the joist's depth?

  1. 1/3

  2. 1/4

  3. 1/5

  4. 1/6

The correct answer is: 1/4

The correct fraction for the maximum depth of a notch at the end of a joist is typically one-fourth of the joist's depth. This guideline is based on structural engineering principles aimed at ensuring that notching does not significantly compromise the integrity or load-bearing capacity of the joist. When notches are deeper than this fraction, it can lead to increased stress concentrations and potential failure points, which are particularly of concern at the ends of joists where loads are more heavily concentrated. Adhering to the guideline of one-fourth keeps the structural integrity intact while still allowing for practical adjustments in finishing or other structural adjustments that may be necessary. This balance is crucial in maintaining safety and functionality in residential and commercial construction.