A wall, floor, or ceiling system tested to contain a fire for a specified number of hours.
A fire-rated assembly is a combination of building materials and components — such as walls, floors, or roofs — that has been tested and listed by a testing laboratory (such as UL) to resist fire for a specified time period. Ratings are expressed in hours (1-hour, 2-hour, etc.) and must be installed exactly as tested to maintain their rating. Building codes specify where fire-rated assemblies are required based on occupancy and construction type.
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