What percentage of depth is allowed for notching of non-load bearing studs?

Notching of non-load bearing studs is governed by the building codes to ensure structural integrity while allowing for necessary alterations to accommodate various installations, such as plumbing, electrical, or insulation. The maximum percentage of depth that can be notched on a non-load bearing stud is set at 40%. This limitation is in place to prevent compromising the strength and stability of the stud, while still allowing enough room for utilities to pass through the framing.

By restricting notching to a maximum of 40%, the code helps maintain the overall structural capacity of the wall assembly. This is particularly important for non-load bearing walls, which may not support significant structural loads, but still require careful consideration in terms of maintaining functionality and safety in residential construction. Adhering to this guideline helps prevent potential issues such as bowing, cracking, or failure of the framing members over time.

The other percentages are either too high or too low, which could lead to unsafe conditions or inadequate provision for necessary installations.