For a built-up roof system in California seismic zones, what is the maximum allowable aggregate surfacing weight per CBC requirements to prevent seismic displacement?
Correct Answer
B) 400 pounds per square (100 sq ft)
CBC Section 1507.10.3 limits aggregate surfacing on built-up roofs to 400 pounds per square maximum. This California-specific seismic provision prevents excessive roof loads that could shift during earthquakes, potentially damaging the roof membrane or creating dangerous falling hazards during seismic events common in California.
Why This Is the Correct Answer
CBC Section 1507.10.3 limits aggregate surfacing on built-up roofs to 400 pounds per square maximum. This California-specific seismic provision prevents excessive roof loads that could shift during earthquakes, potentially damaging the roof membrane or creating dangerous falling hazards during seismic events common in California.
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