In California Seismic Design Category D, what is the maximum allowable building height for a wood-frame residential structure using conventional light-frame construction methods?
Correct Answer
A) 3 stories
CBC Section 2308.12.2.1 limits conventional light-frame wood construction to a maximum of 3 stories in Seismic Design Category D. This California seismic provision ensures structural safety in high seismic risk areas by requiring engineered design for taller wood-frame buildings.
Why This Is the Correct Answer
CBC Section 2308.12.2.1 limits conventional light-frame wood construction to 3 stories in Seismic Design Category D (SDC D). SDC D represents areas with high seismic risk (most of California's urban areas). Beyond 3 stories, engineered design is required to ensure the structural system can resist the larger seismic forces generated in taller buildings.
Why the Other Options Are Wrong
Option B: 5 stories
5 stories is not permitted for conventional (non-engineered) light-frame wood construction in SDC D. Five-story wood structures can exist in California but require engineered lateral systems — not conventional construction methods.
Option C: 4 stories
4 stories exceeds the 3-story maximum for conventional light-frame in SDC D. This limit exists because conventional construction relies on prescriptive provisions that are calibrated only for structures up to 3 stories in high seismic zones.
Option D: 2 stories
2 stories is too conservative and does not reflect the actual CBC limit. The code permits up to 3 stories under conventional construction in SDC D — restricting to 2 stories would unnecessarily limit residential construction without code basis.
Memory Technique
Think '3 stories, SDC D' — the letter D is the 4th letter, but the limit is 3 (one less than 4). In the danger zone (SDC D), you get 3 stories before you need an engineer.
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