FM Global's drainage philosophy places emphasis on which combination?

• A. Maximize drainage speed and aesthetic compatibility.
• B. Design simplicity and minimal materials.
• C. Focus on redundancy, reliability, and prevention of ponding.
• D. Elimination of all drainage features.

Answer: (C)

FM Global’s drainage approach is about reducing the risk of water lingering on a roof by building systems that won’t fail and that keep water moving away even when conditions are challenging. The key idea is redundancy, reliability, and preventing ponding. Redundancy means multiple drainage paths or backup routes so a single blockage or failure won’t leave water standing. Reliability focuses on components and layouts that perform under wind, debris, and aging, so the system continues to work over time. Preventing ponding targets the main failure mode that can lead to membrane damage, leaks, and structural issues.

This combination best fits FM Global’s risk-management mindset, which prioritizes consistent performance and durability under real-world conditions. Designs that merely chase faster drainage, aesthetic goals, or use less material don’t adequately reduce the risk of ponding or failure, and removing drainage features entirely would create unacceptable risk.