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Composite floor slabs or decks consist of profiled steel decking with an in-situ reinforced concrete topping. The steel decking acts as a permanent formwork for the concrete and provides tensile resistance as a result of the shear bond between the deck and concrete. Once the concrete has gained strength, the two materials act together compositely. The composite slab is connected to the steel beams, with the composite interaction being achieved by the attachment of shear connectors to the top flange of the beam. These connectors generally take the form of headed studs and are welded to the beam, and provide sufficient longitudinal shear connection between the beam and the concrete so that they act together structurally. The ComFlor® family of products comprises a number of steel floor profiles, each designed specifically for a particular application area. ComFlor® 51+ is a 51mm deep, classic re-entrant profile that provides excellent composite slab strength characteristics and effective shear stud interaction. Dovetail grooves at 150mm centres provide the best possible anchorage for services underneath, and the virtually flat soffit gives a clean aesthetic appeal and excellent fire protection to the top flange of the beam. The steel floor deck is manufactured in Galvatite® hot dip zinc coated steel, with a guaranteed minimum proof strength of 350N/mm2, and has a fire rating of Class A1 in accordance with EN 13501 [8]. Shear studs are placed centrally in the troughs and the profile provides a 600mm cover width. A section through the composite slab in shown in Figure 1.