B3 61 Contractor Trade Practice Exam

How much can be notched from a load bearing stud without compromising it's structural integrity?

50% 40% 25% 33%

Correct Answer:

25%

Explanation:

Notching a load-bearing stud reduces the wood that carries vertical loads, so there’s a safety limit. For a load-bearing stud, you’re allowed to notch only up to 25% of the stud’s width. With a standard 2x4 (actual width 3.5 inches), that’s about 0.875 inches deep. Going deeper weakens the stud, and you’d need reinforcement (like a steel nail plate, or sistering/replacing the stud) or an alternative routing method. The other percentages would exceed what’s considered safe for a load-bearing member, which is why 25% is the correct guideline. If you’re working with non-load-bearing walls, different allowances can apply.

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