General B Contractor Trade Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success!

When working with non-bearing walls, it is essential to adhere to specific guidelines regarding the structural integrity of the studs. The correct answer states that a maximum of 60% of a stud can be cut when boring holes. This limit is established to ensure that enough material remains to maintain the strength and stability of the stud, preventing any potential failure in the wall structure.

Boring involves drilling a hole through the stud for things like electrical or plumbing runs, which can weaken the structural component. Thus, the guideline of allowing up to 60% cutting ensures that there's still sufficient material left to resist loads and maintain the wall's overall integrity.

When it comes to notching, which involves removing a portion from the edge of a stud, the guidelines typically allow for a maximum cut of 40%. This is because notching can further compromise the stud's structural capacity, and less material should be removed compared to boring.

In summary, the percentages established for boring and notching are critical in managing the structural performance of non-bearing walls while still allowing for necessary alterations in the framing for functional purposes.