When installing plywood wall sheathing in California high seismic areas, what is the required nail spacing at panel edges per the California Residential Code?
Correct Answer
A) 3 inches on center at edges, 6 inches on center in the field
CRC Section R602.10.4 and Table R602.3(1) specify that in seismic design categories D1 and D2, structural wall sheathing requires 8d common nails at 3 inches on center at panel edges and 6 inches on center in the field to provide adequate shear resistance.
Why This Is the Correct Answer
CRC Section R602.10.4 and Table R602.3(1) specify that in Seismic Design Categories D1 and D2 (which encompass most of California), structural wall sheathing must use 8d common nails at 3 inches on center at panel edges and 6 inches on center in the field. The tighter edge nailing is critical because shear forces are transferred at panel edges into the framing members. This 3/6 pattern provides the lateral resistance needed to meet California's seismic demands.
Why the Other Options Are Wrong
Option B: 4 inches on center at edges, 8 inches on center in the field
4 inches at edges and 8 inches in the field is a less aggressive nailing pattern used in lower seismic zones or for non-structural applications. In California's high seismic zones (SDC D1/D2), this spacing does not provide adequate shear wall capacity and does not comply with the CRC prescriptive requirements.
Option C: 2 inches on center at edges, 4 inches on center in the field
2 inches at edges and 4 inches in the field is more aggressive than required and is not a standard prescriptive nailing schedule in the CRC. While tighter nailing provides more shear capacity, it can cause framing splitting and is not the code-specified minimum for SDC D1/D2 — it would also be unnecessarily costly.
Option D: 6 inches on center at edges, 12 inches on center in the field
6 inches at edges and 12 inches in the field is the standard minimum nailing for wall sheathing in low seismic areas or for non-structural sheathing. This pattern is far too loose for California's high seismic zones and would not satisfy the lateral force resistance requirements of the CRC.
Memory Technique
In California's earthquake country, think '3-6 for seismic': edges at 3 inches (tight, because that's where shear transfers), field at 6 inches (looser, interior of panel). The ratio doubles from edge to field: 3 → 6.
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