In a 2x6 exterior load bearing wall, what is the maximum amount of material that can be notched?

• A. 25%
• B. 10%
• C. 15%
• D. 40%

Answer: (A)

Notching a structural member reduces its cross-sectional area, which weakens its ability to carry loads. In exterior load-bearing walls built with 2x6 studs, the guideline is to limit notches to 25% of the stud’s width to preserve strength. A 2x6 is actually 1.5 inches wide, so 25% equals 0.375 inches (3/8 inch). Therefore, the deepest notch allowed on a 2x6 exterior load-bearing stud is about 3/8 inch. Larger notches would require reinforcement or alternative routing.