According to California building standards, what is the required stud spacing for exterior walls in residential construction using 2x4 framing members?
Correct Answer
D) 16 inches on center
California Residential Code Section R602.3.1 establishes 16 inches on center as the standard spacing for 2x4 wall studs in residential construction. While 24-inch spacing is allowed for interior non-bearing walls, exterior walls require the more restrictive 16-inch spacing for structural integrity.
Why This Is the Correct Answer
CRC Section R602.3.1 establishes 16 inches on center as the standard maximum spacing for 2x4 studs in residential exterior walls. This spacing ensures adequate structural support and shear capacity required by California's seismic and load requirements.
Why the Other Options Are Wrong
Option A: 12 inches on center
12 inches on center is more restrictive than required, adds unnecessary material cost, and is not the code-mandated spacing for standard residential exterior walls. It is not listed as a standard spacing in CRC framing tables.
Option B: 19.2 inches on center
19.2 inches on center is used in specific applications (e.g., some engineered floor systems) but is not the standard spacing for 2x4 exterior wall studs under the CRC. It falls between the two common spacings and is a distractor.
Option C: 24 inches on center
24 inches on center is permitted for interior non-load-bearing walls and may be acceptable for 2x6 exterior walls in certain configurations, but it is not the required spacing for 2x4 exterior walls under California residential standards.
Memory Technique
Associate '2x4 exterior = 16 o.c.' as a fixed pair. The smaller the stud (2x4 vs. 2x6), the tighter the spacing required for exterior walls in California.
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