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Costs: products for fi re resistance

Cost consultant Davis Langdon provides indicative costs for fire protection materials and treatments, extinguishing systems and detection and alarm systems. Rates shown are applicable to competitively tendered commercial contracts in Outer London in June

MATERIALS AND TREATMENTS STRUCTURAL STEEL Fire resistance periods shown are indicative: the actual period will depend on the Section Factor Hp/A. Indicative costs are for areas of 250-1,000m Dry casing ú/m l Two layers 12.5mm Gyproc wallboard nailed to timber cradles (30 minutes) 17-19 l Unfaced resin bonded mineral wool board, concealed areas (60 utes) 14-16 (120 utes) 15-17 l Frameless non-combustible boards, unjointed (60 utes) 15-18 l Vermiculite board, mechanically fixed to steel angle (60 utes) 24-28 l Frameless fibreboard, suitable for direct decoration (120 utes) 30-35 Intumescent paint l Thin film intumescent coating, spray applied (60 minutes) on-site application 8-12 off-site lication 16-24 (120 minutes) on-site application 40-50 off-site lication 50-65 Separate decorative sealer top coat add 3-5 l Cementitous spray applied to achieve (60 minutes) 15-20 Rates quoted are average figures: rates for small section steelwork and hollow sections will be higher; rates for large section steelwork will be lower STRUCTURAL TIMBER Impregnation ú/m° l Pre-treatment of timber including flame proofing 120-135 l Flame retardant coating ú/m 2 Three coats fire-resistant clear finish 9-12 Fire-resisting elements ú/m 2l Metal stud partition with gypsum based products (30 utes) 40-55 (60 minutes) 45-60 (120 utes) 70-100 l In fire resistant ceilings below roof spaces:

two layers (30mm) Gyproc Fireline on M/F system (60 utes) 20-25 SEALING 2Linear gap seals l Intumescent strip and smoke seals to doors 10-14 l Intumescent foam filling between frame and wall construction, (60 minutes) wall up to 215mm wide;

horizontal 7-10 vertical 9-12 CAVITY BARRIERS ú/m l Rockwool cavity barrier in roof or ceiling voids One 50mm layer (30 minutes) 13-17 Two 50mm layers (60 minutes) 22-24 l Intumescent impregnated reinforced glass cloth fire barrier curtains (30 minutes) 23-25 ú /m l Rockwool cavity barrier below access floors;

300mm void (one hour) 18-22 Mineral wool to top of internal walls 7 - 9 DETECTION, ALARMS, ESCAPE Indicative rates for analogue addressable detectors in multi zone fire alarm systems l Offi ces ú/m° shell and core installation 11-15 category ut 6-10 l Hotels, addressable system with sounders in all guest bedrooms 13-19 l Retail supermarkets 6-8 l Retail department stores 13-19 l Leisure centre 17-23 l Residential, top quality apartments 15-19 l Residential, private dwellings (wired) 5-8 l Residential, private dwellings (radio-linked) 3-19 Smoke detectors (cost excludes wiring) ú/unit l Conventional-ionisation 42-52 l Addressable-ionisation 58-72 l Conventional-optical 42-52 l Addressable-optical 62-78 l Radio-linked 205-225 l Aspirating very early smoke detection (based on 10m of pipe work) Allow ú4,100 Carbon monoxide detectors l Addressable 70-85 Heat detectors l Fixed/rate of rise conventional 42-47 l Addressable 47-67 l Radio-linked 205-225 Flame detectors l Infrared 1,230-1,450 l Ultra violet 1,550-1,850 Typical circuit costs based on MICS cable (supply and first fix) l Smoke detector/heat detector (point type) 140-160 l Call point 155-175 l Sounder/xenon beacon 155-175 l Loop powered sounder 140-160 l Carbon dioxide detector 140-160 A saving of about 20 per cent of the overall circuit costs may be achieved by using a soft skin cable to BS7629 EXTINGUISHING SYSTEMS SPRINKLERS Guide prices for installations include sprinkler heads and all associated pipework, valve sets, booster pumps and water storage 2 of serviced area l Light hazard 23-28 l Ordinary hazard 27-37 l Extra high hazard 33-39 GASEOUS FIRE SUPPRESSION SYSTEMS Guide prices for installations include gas storage, distribution and heads, gas exhaust system, ductwork and dedicated extract fans ú/m° of room volume l FM200 gas 42-62 l Argonite/Inergen 62-82*

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