What is an acceptable type of notch in ceiling joists?

A notch in ceiling joists is acceptable when it allows for minimal structural compromise, particularly if it is located in an area that does not bear a significant load. A 2x2 notch in the center bottom of the joist can be permissible because it reduces the potential for weakening the joist's structural integrity, especially if it remains within the dimension (depth) that the joist can effectively carry its load.

Notching at the center bottom can maintain more of the joist's strength compared to notches located elsewhere, especially those that might cut through the joist's critical load-bearing areas. When determining the acceptability of notches, building codes typically emphasize minimizing stress and maintaining load-bearing capabilities. In contrast, notches near the edges or in larger dimensions can more appreciably compromise the joist's strength, making them less acceptable. Thus, the dimensions and location of the notch play crucial roles in assessing their safety and compliance with building standards.