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A building code limits the designer's choice of structural systems and build-ing components according to the occupancy, height, and floor area of the building that is being designed.

1. Every building code centers on two comprehensive tables: One designates the height and area limitations for buildings of different uses, according to the type of construction that is used; the other defines each construction type in terms of the fire resistance rating required for each of its major components (columns, bearing walls, beams, slabs, corridor and stair enclosures, shaft walls, and exterior walls). Using these two tables, thedetailercan quickly establish the range of construction materials and systems from which the building may be built.

2. Additional tables in each building code give required lire resistance ratings for fire walls and fire doors.

3. Fire resistance ratings for available building components and systems arc

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