Part 1: Architect’s Guide 1 - 29 4.5 Summary Table 4.4 gives typical weights of building elements. Table 4.4 Typical weights for building elements Element Typical weight Precast units (spanning 6 m, designed for a 5 kN/m2 imposed load) 3 to 4,5 kN/m2 Plain slab (Normal weight concrete, 200 mm thick) 5 kN/m2 Composite slab (Normal weight concrete, 130 mm thick) 2,6 to 3,2 kN/m2 Composite slab (Lightweight concrete, 130 mm thick) 2,1 to 2,5 kN/m2 Services 0,25 kN/m2 Ceilings 0,1 kN/m2 Steelwork (low rise 2 to 6 storeys) 35 to 50 kg/m2 Steelwork (medium rise 7 to 12 storeys) 40 to 70 kg/m2 Steel provides many advantages to the architect for the design of a multi-storey building: Large spans are possible A steel building is lighter than a traditional building The foundations are simple and less expensive This solution is well adapted to soils with poor load-bearing qualities.
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