For built-up roof systems in California seismic design categories D, E, and F, what additional requirement must be met for roof membrane attachment to prevent seismic damage?
Correct Answer
B) Ballasted systems are prohibited and full adhesion or mechanical attachment is required
CBC Section 1507.10.2 prohibits ballasted roof systems in seismic design categories D, E, and F, requiring full adhesion or mechanical attachment instead. This California seismic-specific requirement prevents loose ballast from becoming projectiles during earthquakes and ensures roof membrane integrity under seismic forces.
Why This Is the Correct Answer
CBC Section 1507.10.2 prohibits ballasted roof systems in seismic design categories D, E, and F, requiring full adhesion or mechanical attachment instead. This California seismic-specific requirement prevents loose ballast from becoming projectiles during earthquakes and ensures roof membrane integrity under seismic forces.
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