PROTECTION OF FLOOR SLAB WITH STEEL BEAMS WITH SUSPENDED CEILING AT SPLIT LEVELS WITH SERVICES AND PENETRATIONS

Supply and installation of a suspended ceiling at differentiated levels − with services such as pipes, ventilation ducts and electrical cables, and penetrations such as threaded rods, light fittings, smoke detectors, electrical cables and corrugated conduits located in the cavity − protecting a non-composite steel floor slab, with fire resistance REI 120, placed 200 mm below the underside of the beams, made with FIREGUARD® 13 boards, 12,7 mm thick, maximum dimensions 1200x2000 mm, made of calcium silicates and sulphates, asbestos-free

The boards will be screwed with phosphated self-drilling screws, 3,5 mm dia., 25 mm long, placed at 250 mm centres, to a metal structure composed of a secondary framing consisting of galvanised steel “C” profiles, dimensions 50x27x0,6 mm, placed at 500 mm centres, and a main metal framing consisting of the same “C” profiles placed at 900 mm centres, fixed to the secondary framing by means of purpose-made orthogonal hooks and suspended with hangers at 900 mm centres. The finishing of the joints and screw heads