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Beams or joists made with sawn lumber or glulam can be notched. End notches affect the shear resistance in a number of ways depending on the material, whether it is on the tension side of the member (ordinarily the bottom), or the compression side, and the length of the notch.
Sizer evaluates the notching requirements at each end support for each load combination. It is possible therefore for it to apply compression edge provisions at a support for some load combinations and tension edge provisions for others. Only the critical case is shown in the design results.
Similarly, the design results show the critical case from all the supports, so it is possible that notch results are not shown if another, non-notched support is critical for shear design.
Refer to Notch Design for the reductions in shear strength for end-notched members.
Interior notches result in a reduced section size in the calculation of moment resistance. This reduction is not applied to end notches unless there is an applied moment at the end, as otherwise the moment can be expected to be close to zero.