Glossary
Fire Rating
Plain-Language Definition
The measured time in minutes that a building element (wall, door, floor, column) can withstand a standard fire test while maintaining its structural integrity, preventing flame passage, and limiting heat transmission.
Technical Context
Fire ratings are determined by standard fire tests: ASTM E119, BS 476, AS 1530.4, EN 1363. Ratings are expressed in minutes: 30, 60, 90, 120, 180, 240. Fire doors are rated as FD30, FD60, FD90, FD120. Building codes specify minimum fire ratings based on building height, use, occupancy, and compartment size. Higher buildings and higher-risk uses require higher fire ratings.
Why It Matters
Fire rating determines how long a building element will protect occupants during a fire. A 120-minute rated column gives 2 hours before structural collapse. A 60-minute rated door holds back fire for 1 hour. Inadequate fire ratings — or fire-rated assemblies compromised by modifications — are a life-safety risk.
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