In California seismic zones, what is the required nailing pattern for structural sheathing panels when used as shear walls according to the CBC?
Correct Answer
B) 8d nails at 6 inches on center at panel edges and 12 inches on center in the field
CBC Section 2306.4.1 and Table 2306.4.1 specify that structural sheathing for shear walls requires 8d common nails spaced 6 inches on center at panel edges and 12 inches on center in the field. This nailing schedule provides the required shear capacity for California's seismic design requirements.
Why This Is the Correct Answer
CBC Section 2306.4.1 and Table 2306.4.1 specify 8d common nails at 6 inches on center at panel edges and 12 inches on center in the field as the standard shear wall nailing schedule for structural sheathing. The 8d nail provides the required diameter and penetration for shear transfer, and the 6"/12" spacing delivers the code-required shear capacity for California's seismic design demands.
Why the Other Options Are Wrong
Option A: 6d nails at 6 inches on center at panel edges and 12 inches on center in the field
6d nails are undersized for structural shear wall applications. 6d common nails have a smaller diameter and shorter length than 8d nails, resulting in less shear capacity per fastener. Using 6d nails would not meet CBC shear wall table requirements.
Option C: 10d nails at 4 inches on center at panel edges and 6 inches on center in the field
10d nails at 4"/6" spacing represent a higher-capacity shear wall schedule used when greater seismic resistance is needed (higher shear wall unit values). This schedule exceeds the standard minimum requirement and would typically appear in high-demand shear wall designs, not the baseline CBC requirement.
Option D: 8d nails at 4 inches on center at panel edges and 8 inches on center in the field
8d nails at 4"/8" spacing is not the standard schedule listed in CBC Table 2306.4.1 for the base shear wall configuration. While 8d nails are correct, the spacing does not match the code table's standard 6"/12" pattern.
Memory Technique
Remember '8d = Edges at 6, Field at 12' — think of the nail as an '8' with two circles: the top circle (edges) gets nails every 6 inches, the bottom circle (field) gets them every 12 inches. The '8d' nail is the California seismic standard.
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