In California, which type of special inspection is required during the placement of reinforcing steel for cast-in-place concrete construction in Seismic Design Category D structures?
Correct Answer
B) Continuous inspection throughout placement
CBC Section 1705.3 requires continuous special inspection during placement of reinforcing steel in cast-in-place concrete for structures in Seismic Design Category D. This ensures proper positioning and spacing of reinforcement, which is critical for seismic performance in California's high-risk seismic zones.
Why This Is the Correct Answer
CBC Section 1705.3 mandates continuous special inspection during reinforcing steel placement for cast-in-place concrete in Seismic Design Category D. Continuous means the inspector must be present the entire time steel is being placed, not just periodically. This is essential because improper rebar spacing, cover, or positioning in high-seismic zones can lead to catastrophic structural failure during an earthquake.
Why the Other Options Are Wrong
Option A: Periodic inspection only
Periodic inspection is insufficient for SDC D reinforcing steel placement. Periodic inspection (inspector present only at key intervals) is allowed for lower-risk activities or lower seismic categories, but CBC Section 1705.3 specifically requires continuous inspection for this critical structural element in high-seismic zones.
Option C: Final inspection after placement is complete
Final inspection after placement is complete is far too late to catch installation errors. Once concrete is poured over incorrectly placed rebar, the defect is buried and effectively impossible to correct without demolishing the structural element. Special inspection must occur during placement to be meaningful.
Option D: No special inspection required
Special inspection is absolutely required for this work in SDC D. California's high seismic risk means reinforcing steel inspection is one of the most critical quality control measures. Skipping it would violate CBC Section 1705.3 and expose the contractor to significant liability.
Memory Technique
SDC D = 'Demand Continuous' — the higher the seismic category, the more demanding the inspection requirement. Think: rebar must be verified BEFORE the concrete covers it up forever.
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