In California seismic zones, what is the required nail spacing for structural sheathing at panel edges when using 15/32-inch plywood or OSB?
Correct Answer
A) 6 inches on center at edges, 12 inches on center in the field
CRC Table R602.3(1) and California's seismic provisions require structural sheathing to be nailed 6 inches on center at panel edges and 12 inches on center in the field when using 8d common nails with 15/32-inch plywood or OSB. This spacing provides adequate shear resistance for California's seismic requirements.
Why This Is the Correct Answer
CRC Table R602.3(1) and California's seismic provisions specify 6 inches on center at panel edges and 12 inches on center in the field when using 8d common nails with 15/32-inch plywood or OSB. This is the standard prescriptive shear wall nailing pattern that provides adequate lateral resistance for California seismic conditions.
Why the Other Options Are Wrong
Option B: 2 inches on center at edges, 4 inches on center in the field
Nailing at 2 inches on center at edges and 4 inches in the field represents an extremely tight pattern used only in high-demand engineered shear walls (often called 'case 6' or special shear walls) and requires specific engineering design. This is not the standard prescriptive requirement for 15/32-inch sheathing.
Option C: 3 inches on center at edges, 6 inches on center in the field
A 3-inch edge / 6-inch field pattern is an intermediate schedule sometimes used in higher shear demand applications but is not the standard requirement for 15/32-inch sheathing under the general CRC provisions. It would represent over-nailing for standard applications.
Option D: 4 inches on center at edges, 8 inches on center in the field
A 4-inch edge / 8-inch field pattern is another intermediate nailing schedule. Like option C, it does not match the standard CRC Table R602.3(1) prescription for 15/32-inch panels and 8d common nails in standard seismic applications.
Memory Technique
For standard 15/32-inch sheathing: 6 at the edge, 12 in the middle. Think of it as a 2:1 ratio — the field gets twice the spacing of the edge, meaning half the nail density where loads are lower.
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For wood structural panel shear walls in California, what is the minimum nail penetration requirement into framing members when using 8d common nails?
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