For built-up roof systems in California seismic design categories D, E, and F, what additional requirement must be met for roof membrane attachment?
Correct Answer
A) Design for increased uplift forces due to seismic motion amplification
California Building Code Section 1613A.5.4 requires consideration of seismic motion amplification effects on roof systems in high seismic zones. This includes designing for increased uplift forces that result from building acceleration during seismic events, ensuring the roof membrane and attachment system can withstand combined wind and seismic loads.
Why This Is the Correct Answer
CBC Section 1613A.5.4 requires that roof systems in high seismic zones (categories D, E, F) be designed to account for seismic motion amplification — the amplified lateral and uplift forces caused by building acceleration during an earthquake. The membrane attachment must resist these combined forces, which exceed standard wind-only design loads.
Why the Other Options Are Wrong
Option B: Use only mechanical fasteners, no adhesives
Prohibiting adhesives and requiring only mechanical fasteners is not a CBC requirement for seismic zones. Adhesives can perform adequately in seismic conditions when properly engineered; the code requires designing for increased forces, not mandating a specific attachment method. This answer oversimplifies and misrepresents the requirement.
Option C: Install seismic isolation joints every 200 feet
Installing seismic isolation joints every 200 feet is not a CBC roofing requirement. Seismic isolation joints are used in structural systems for large buildings, not as a roof membrane installation requirement. This answer conflates structural engineering concepts with roofing installation practices.
Option D: Increase fastener density by 50% over standard requirements
Increasing fastener density by a fixed 50% is not the code requirement. The CBC requires a performance-based design approach — engineering for the actual amplified uplift forces — rather than a blanket 50% increase. Different projects will have different force demands based on building weight, height, and location.
Memory Technique
Think: 'Seismic = Amplified Forces = Design for It.' The key word is 'amplification' — seismic motion amplifies the forces on the roof. Your attachment system must be engineered to resist these amplified uplift forces. No shortcuts, no fixed percentages — proper engineering design is the answer.
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