1 The following fire resistance tables for Multideck 146 are based on analysis by the Steel Construction Institute.

2 All stated slab depths comply with the minimum fire insulation criteria.

3 The composite slab is treated as a single span so the values shown can be used on a single or continuous slab.

4 All solutions have a minimum of one 16 bar grade B500 per trough at 60mm height. The load tables are shown for unanchored and anchored bar reinforcement. Where there are internal supports anchoring the bars can be achieved with a simple overlap. At the end support, U bars around composite shear studs will provide the anchor. Otherwise use embeddment lengths beyond the inner flange edge and straight or bent bars. The unanchored solution does not need any additional attachment of the bars.

5 Minimum laps should be 300mm for A142 mesh and 400mm for A193, A252 and A393 mesh.

6 Mesh reinforcement should be placed near the upper edge of the concrete slab, in a zone of 15mm to 40mm.

7 The tables are based upon Grade C25/30 concrete for other grades use the Multideck design software.

8 The tables must be read in conjunction with load / span tables for Multideck 146 to verify the structural integrity of the composite slab.

9 The tables are based on a load factor of 1.0 for the fire case. Further capacity can be achieved by taking into account the reduced partial factor of 0.8 or 0.5 as permitted in BS 5950: Part 8 for non-permanent imposed loads.

10 For load / span conditions beyond the scope of these tables, the Kingspan Multideck design software should be used to check for a solution.

11 For fire performance on propped construction use the Multideck Design Software.

12 Span values are centres of supports based on a width of support of 100mm. Minimum of 50mm end bearing on steel or concrete and 75mm on other materials.