What is the required stud spacing for exterior walls in California when using 2x4 framing members according to the CRC?
Correct Answer
C) 16 inches on center
CRC Section R602.3.1 specifies that 2x4 exterior wall studs must be spaced at 16 inches on center maximum. While 2x6 studs can be spaced at 24 inches on center, the smaller 2x4 members require closer spacing to maintain structural integrity and provide adequate attachment for sheathing materials.
Why This Is the Correct Answer
CRC Section R602.3.1 specifies a maximum stud spacing of 16 inches on center for 2x4 exterior wall studs. The smaller cross-section of a 2x4 (compared to 2x6) limits its capacity to span between top and bottom plates without excessive deflection or buckling, making 16-inch spacing the prescriptive maximum.
Why the Other Options Are Wrong
Option A: 12 inches on center
12 inches on center is more restrictive than what the CRC requires for 2x4 studs and is not the standard spacing. It would use significantly more lumber than the code mandates.
Option B: 24 inches on center
24 inches on center is permitted for 2x6 exterior wall studs, not 2x4. Using 2x4s at 24-inch spacing would leave them overspanned, reducing wall strength and sheathing support.
Option D: 19.2 inches on center
19.2 inches on center (a 5-stud-per-8-foot module) is sometimes used in floor framing but is not the standard for exterior wall studs. The CRC prescribes 16 inches as the maximum for 2x4 exterior walls.
Memory Technique
A 2x4 is the smaller stud, so it gets the smaller spacing: 16 inches. A 2x6 is the bigger stud, so it can go to 24 inches. Small stud = small spacing (16); big stud = big spacing (24).
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