In California wood frame construction, what is the maximum spacing allowed for anchor bolts connecting the sill plate to the foundation?
Correct Answer
C) 6 feet on center
CBC Section 2308.6.1 requires anchor bolts to be spaced at maximum 6 feet on center, with at least two bolts per plate section and one bolt within 12 inches of each end. This spacing ensures adequate connection between the wood frame structure and foundation, which is essential for seismic load transfer in California construction.
Why This Is the Correct Answer
CBC Section 2308.6.1 sets the maximum anchor bolt spacing at 6 feet on center. At least two bolts are required per plate section, and one bolt must be placed within 12 inches of each plate end. This provides a reliable load path for lateral seismic forces from the wood frame to the foundation.
Why the Other Options Are Wrong
Option A: 4 feet on center
4 feet on center is more restrictive than what the code requires and is not the standard spacing. It would result in more bolts than necessary for typical conditions, increasing material and labor cost.
Option B: 8 feet on center
8 feet on center exceeds the maximum allowed spacing. At this wider interval, sill plates would have insufficient anchorage to resist the lateral forces that occur during California earthquakes.
Option D: 10 feet on center
10 feet on center is far too wide a spacing. It would leave long segments of sill plate essentially unanchored, creating a weak link in the seismic load path from structure to foundation.
Memory Technique
Picture six-foot-tall anchor bolts (like fence posts) spaced evenly along the sill plate. Six feet, six feet, six feet — the rhythm of a secure California foundation. '6 feet = sill plate anchor bolt max.'
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