Under California Building Code requirements, what is the maximum spacing allowed for anchor bolts in wood sill plates for single-story residential construction?
Correct Answer
A) 6 feet on center
CBC Section 2308.6 requires anchor bolts in wood sill plates to be spaced no more than 6 feet on center for single-story construction. Additionally, bolts must be located within 12 inches of each end of each piece, which is critical for California's seismic requirements.
Why This Is the Correct Answer
CBC Section 2308.6 requires anchor bolts to be spaced no more than 6 feet on center in wood sill plates for single-story construction. Additionally, bolts must be placed within 12 inches of each end of each sill plate piece. This spacing ensures adequate load transfer between the wood framing and concrete foundation.
Why the Other Options Are Wrong
Option B: 10 feet on center
10 feet on center is too large a spacing and not permitted under the CBC. Such wide spacing would leave long sections of sill plate inadequately anchored, especially problematic in seismic events.
Option C: 4 feet on center
4 feet on center is more conservative than required but is not the maximum — it is allowed but the question asks for the maximum permitted spacing, which is 6 feet.
Option D: 8 feet on center
8 feet on center exceeds the 6-foot maximum permitted by CBC Section 2308.6 and would not meet California's seismic anchoring requirements.
Memory Technique
Six feet, six feet — the standard spacing for anchor bolts in a sill plate. A standard 8-foot stud wall width is too wide; keep bolts within 6 feet of each other.
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