What is the maximum notch allowed in a 2x10 exterior wall stud?

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Multiple Choice

What is the maximum notch allowed in a 2x10 exterior wall stud?

Explanation:
Notching a stud reduces its cross‑section, which weakens the wall framing. To keep enough wood in place, codes cap notch depth at a fraction of the stud’s width. The common rule is 25% of the stud width. A 2x10 has a width of 5.5 inches, so 25% equals 1.375 inches, i.e., 1 3/8 inches. That is the maximum notch you can make without requiring extra reinforcement. Notches deeper than that would compromise strength and would need alternative routing or reinforcement.

Notching a stud reduces its cross‑section, which weakens the wall framing. To keep enough wood in place, codes cap notch depth at a fraction of the stud’s width. The common rule is 25% of the stud width. A 2x10 has a width of 5.5 inches, so 25% equals 1.375 inches, i.e., 1 3/8 inches. That is the maximum notch you can make without requiring extra reinforcement. Notches deeper than that would compromise strength and would need alternative routing or reinforcement.

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