Notches in beams should:

When assessing the structural integrity of beams, it is crucial to understand that notches can significantly weaken the beam. The presence of notches can compromise the beam's load-bearing capacity and overall structural safety. An unnotched beam is designed to uniformly distribute loads, and cutting into it can create points of weakness and increase the likelihood of failure under pressure.

The preferred practice is to avoid notching beams altogether, as it helps to maintain their strength and functionality. While there are certain guidelines regarding where notches may be permissible if they must exist, the safest and most structurally sound option is to ensure that beams remain free of notches.

This prioritization of structural integrity is why the assertion that notches in beams should not be present is the most valid response.