California Residential Inspector Practice Exam

What is the maximum notch allowed for wood studs within a bearing partition?

1. 10 percent of the stud width

2. 15 percent of the stud width

3. 25 percent of the stud width

4. 30 percent of the stud width

The correct answer is: 25 percent of the stud width

The correct choice indicates that the maximum notch allowed for wood studs within a bearing partition is 25 percent of the stud width. This specification is important in construction because notching can significantly affect the structural integrity of the stud. When wood studs provide bearing support, they are critical for maintaining the load-bearing capacity of walls. A notch is a cut made along the length of the stud, and depending on its depth, it may weaken the stud and alter the way loads are distributed through the wall assembly. By permitting a maximum notch of 25 percent of the stud width, building codes establish a balance between flexibility for utility installation—such as plumbing or electrical runs—and the structural strength necessary to support the loads above. This regulation helps ensure safety and stability in residential construction while allowing for practical modifications. Not exceeding this limit means that the structural integrity of the studs remains largely intact, which is vital for preventing failure in load-bearing scenarios.