For wood structural panel shear walls in California Seismic Design Category D, what is the minimum nail penetration requirement into framing members when using 8d common nails?
Correct Answer
A) 1.5 inches
CBC Table 2306.4.1 requires 8d common nails to penetrate at least 1.5 inches into framing members for wood structural panel shear walls. This penetration ensures adequate withdrawal and lateral resistance for the high seismic forces expected in California's Seismic Design Category D zones.
Why This Is the Correct Answer
CBC Table 2306.4.1 specifies that 8d common nails used in wood structural panel shear walls must penetrate at least 1.5 inches into framing members. This embedment depth ensures sufficient withdrawal resistance and lateral load transfer in high-seismic zones like California's Seismic Design Category D. Inadequate penetration would allow nails to pull out under the racking forces generated by a significant earthquake.
Why the Other Options Are Wrong
Option B: 1.25 inches
1.25 inches is below the minimum required 1.5-inch penetration. While it may seem close, the code requirement is not a recommendation — it is a minimum, and 1.25 inches does not meet code for SDC D applications with 8d common nails.
Option C: 1 inch
1 inch is significantly below the required 1.5-inch minimum. A 1-inch penetration provides inadequate lateral and withdrawal capacity for seismic shear wall applications. This depth might be confused with minimum penetration for lighter-duty connections or thinner sheathing.
Option D: 1.75 inches
1.75 inches exceeds the minimum requirement. While deeper penetration is not inherently harmful, this value does not represent the code minimum. Choosing 1.75 inches suggests misremembering the requirement as more conservative than it is.
Memory Technique
Remember '8d = 1.5 inches deep' as a pairing: the nail designation '8d' and the depth '1.5' are the key numbers. Visualize an 8-penny nail driven 1.5 inches into a stud — that's the minimum for California seismic shear walls.
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