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Costs: products for fire resistance

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Cost consultant Davis Langdon and Everest 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 2003. Rates exclude VAT

MATERIALS AND TREATMENTS STRUCTURAL STEEL

Fire resistance periods shown are indicative: the actual period will depend on the Section Factor Hp/A Indicative costs for areas of 250-1,000m 2£/m 2Dry casing Two layers 12.5mm Gyproc wallboard nailed to timber cradles (30 mins) 16-18 Unfaced resin-bonded mineral wool board, concealed areas (60 mins) 13-15 (120 mins) 14-16 Frameless non-combustible boards, unjointed (60 mins) 13-17 Vermiculite board, mechanically fixed to steel angle (60 mins) 22-26 Frameless fibreboard, suitable for direct decoration (120 mins) 27-32 Intumescent paint Thin-film intumescent coating, spray applied 30 mins FR on-site application 7-10 off-site application 9-13 60 mins FR on-site application 10-12 off-site application 13-20 90 mins FR 17-32 Separate decorative sealer top coat, add 3-5 Spray-applied mineral fibre 60 mins FR 7-9 90 mins FR 9-11 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

£/m 3Impregnation Pre-treatment of timber including flame proofing 115-130 Flame retardant coating Three coats fire-resistant clear finish 8-10 Non-combustible sheet or board for constructing fire-resisting elements Gypsum-based products: in timber stud partitions: 12.5mm Gyproc Wallboard (30 mins) 8-10 two layers of 12.5mm thick Gyproc Wallboard (60 mins) 16-18 in fire resistant timber floors or fire-resistant ceilings below roof spaces: 12.5mm Gyproc Wallboard to ceilings (30 mins) 9-11 12.5mm Gyproc Fireline board (30 mins) 9-11 two layers (25mm) Gyproc Wallboard (30 mins) 14-16 two layers (25mm) Gyproc Fireline (60 mins) 16-18 Asbestos-free insulating board: 6mm lining to ceilings (30 mins) 16-20 9mm lining to walls (30 mins) 21-23 9mm lining to ceilings with 9mm fillets under joists 22-24 Sealing £/m Linear gap seals Intumescent strip and smoke seals to doors 9-14 Intumescent foam filling between frame and wall construction 20mm thick (120 mins), wall up to 215mm wide;

horizontal 11-13 vertical 13-16

DETECTION, ALARMS, ESCAPE

Smoke detectors (cost excludes wiring) £/unit Conventional-ionisation 40-50 Addressable-ionisation 55-70 Conventional-optical 40-50 Addressable-optical 55-70 Radio-linked 200-220 Aspirating very early smoke detection (based on 10m of pipe work) Allow £4,000 Carbon monoxide detectors Addressable 65-80 Heat detectors Fixed/rate of rise conventional 40-45 Addressable 45-65 Radio-linked 200-220 Flame detectors Infrared 1,200-1,400 Ultraviolet 1,500-1,800 Typical circuit costs based on MICS cable (supply and first fix) Smoke detector/heat detector (point type) 135-155 Call point 150-170 Sounder/xenon beacon 150-170 Loop powered sounder 135-155 Carbon dioxide detector 135-155 A saving of about 20 per cent of the overall circuit costs may be achieved by using a soft skin cable to BS 7629

EXTINGUISHING SYSTEMS

Sprinklers Guide prices for installations include sprinkler heads and all associated pipework, valve sets, booster pumps and water storage £/m 2of serviced area Light hazard 20-25 Ordinary hazard 25-35 Extra high hazard 31-37 Gaseous fire suppression systems Guide prices for installations include gas storage, distribution and heads, gas exhaust system, ductwork and dedicated extract fans £/m 3of room volume FM200 gas 40-60 Argonite/Inergen 60-80* *Where a number of separate rooms are being protected, centralised storage may be adopted with cost savings of up to 30 per cent

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