What is the maximum depth that wood studs in exterior walls are permitted to be cut or notched?

The maximum depth that wood studs in exterior walls can be cut or notched is 25% of the stud's width. This guideline is established to maintain the structural integrity and load-bearing capacity of the studs.

Cutting or notching beyond this limit can compromise the strength and stability of the wall system. It can lead to failures under load conditions, such as bending or buckling, which could result in serious structural issues for the building. The 25% limitation is a widely recognized standard in building codes to ensure that while some modifications can be made for electrical or plumbing installations, they do not weaken the structural framework significantly. This threshold is critical for maintaining the safety and durability of the building.