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A fire-resistance rating is the time (in hours) that a building element or assembly (wall, floor, door, column) is expected to resist fire exposure under standardized testing. Ratings (e.g., 1-hour, 2-hour) apply to specific tested assemblies, not just materials. Fire ratings support compartmentation, structural stability, and safe egress time.
Worked example(s) Example: A 1-hour rated corridor wall must be built as a listed 1-hour assembly (e.g., specific stud type, gypsum layers, fastener spacing) and any penetrations must be protected (firestopping).
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