Roof

Suspended slabs; average depth; protected steel frame; no coverings or finishes; per m2 of upper floor area up to six storeys m2 193.25 to 247.42

Extra per m2 of upper floor area for wrought formwork m2 4.54 to 5.42 sound reducing quilt in screed m2 4.83 to 8.64 insulation to avoid cold bridging m2 8.64 to 11.86

ROOF

Softwood flat roofs

joists; average depth; 25 mm softwood boarding; PVC rainwater goods; plasterboard; skim and emulsion ; per m2 of roof plan area three layer felt and chippings m2 102.48 to 128.83 two coat asphalt and chippings m2 98.09 to 142.01

Softwood trussed pitched roofs

Structure only comprising 100 x 38 mm Fink trusses @ 600 mm centres (measured on plan) ; per m2 of roof plan area 30° pitch m2 24.89 to 29.28 35° pitch m2 26.35 to 29.28 40° pitch m2 27.82 to 33.67

Fink roof trusses; narrow span; 100 mm insulation; PVC rainwater goods; plasterboard; skim and emulsion per m2 or roof plan area concrete interlocking tile coverings m2 105.41 to 142.01 clay pantile coverings m2 114.19 to 150.79 composition slate coverings m2 120.05 to 156.65 plain clay tile coverings m2 142.01 to 180.07 natural slate coverings m2 150.79 to 188.86 reconstructed stone coverings m2 122.98 to 196.18

Monopitch roof trusses; 100 mm insulation; PVC rainwater goods; platerboard; skim and emulsion ; per m2 of roof plan area concrete interlocking tile coverings m2 127.37 to 150.79 clay pantile coverings m2 124.44 to 156.65 composition slate coverings m2 131.76 to 166.90 plain clay tile coverings m2 150.79 to 191.78 natural slate coverings m2 156.65 to 196.18 reconstructed stone coverings m2 128.83 to 204.96

Steel trussed pitched roofs

Steel roof trusses and beams; thermal and accoustic insulations; per m2 of roof plan area aluminium profiled composite cladding m2 272.30 to 323.54

Steel roof and glulam beams; thermal and accoustic insulation; per m2 of roof plan area aluminium profiled composite cladding m2 272.30 to 360.14

Item Unit Range £

SUPERSTRUCTURE - cont'd

ROOF - cont'd

Concrete flat roofs

Structure only comprising reinforced concrete suspended slab; no coverings or finishes ; per m2 of roof plan area 3.65 m span; 8.00 KN/m2 loading m2 67.34 to 70.27 4.25 m span; 8.00 KN/m2 loading m2 80.52 to 84.91

Precast concrete suspended slab; average depth; 100 mm insulation; PVC rainwater goods; per m2 of roof plan area two coat asphalt coverings and chippings m2 122.98 to 171.29

Reinforced concrete or waffle suspended slabs; average depth; 100 mm insulation; PVC rainwater goods; per m2 of roof plan area two coat asphalt coverings and chippings m2 133.22 to 175.68

Reinforced concrete suspended slabs; on 'Holorib' permanent steel shuttering; average depth; 100 mm insulation; PVC rainwater goods; per m2 of roof area two coat asphalt coverings and chippings m2 124.44 to 149.33

Flat roof decking and finishes

Woodwool roof decking; per m2 of roof plan area 50 mm thick; two coat asphalt coverings to BS 6925 and chippings m2 55.63 to 70.27

Galvanised steel roof decking; 100 mm insulation; three layer felt roofing and chippings ; per m2 of roof plan area 0.7 mm thick; 3.74 m span m2 61.49 to 76.13 0.7 mm thick; 5.13 m span m2 62.95 to 79.06

Aluminium roof decking; 100 mm insulation; three layer felt roofing and chippings ; per m2 of roof plan area 0.9 mm thick; 2.34 m span m2 71.74 to 87.84

Metal decking; 100 mm insulation; on wood/steel open lattice beams; per m2 of roof plan area three layer felt roofing and chippings m2 106.87 to 131.76 two layer higher performance felt roofing and chippings m2 111.26 to 133.22

Roof claddings

Non-asbestos profiled cladding; per roof plan area 'profile 3'; natural m2 18.45 to 22.84 'profile 6'; natural m2 20.50 to 25.03 'profile 6'; natural; insulated; inner lining panel m2 22.84 to 25.03 Extra for colours m2 2.05 to 2.64

Non-asbestos profiled cladding on steel purlins; per m2 of roof plan area Insulated m2 36.16 to 45.68 Insulated; with 10% translucent sheets m2 40.70 to 47.87 Insulated; platerboard inner lining on metal tees m2 59.00 to 69.10

PVF2 coated galvanised steel profiled cladding on steel purlins; per m2 of roof plan area cladding only; 0.72mm thick m2 25.03 to 36.16 Insulated m2 44.07 to 65.73 Insulated; plasterboard inner lining on metal tees m2 65.73 to 93.55 Insulated; plasterboard inner lining on metal tees; with 1% fire vents m2 76.86 to 115.80 Insulated; plasterboard inner lining on metal tees; with 2.5% fire vents m2 95.75 to 133.66 Insulated; coloured inner lining panel m2 67.93 to 95.75 Insulated; coloured inner lining panel; with 1% fire vents m2 76.86 to 106.87 Insulated; coloured inner lining panel; with 2.5% fire vents m2 95.75 to 124.73 Insulated; sandwich panel m2 142.59 to 249.59

Item Unit Range £

Rooflights/patent glazing and glazed roofs

Rooflights standard pvc m2 159.58 to 285.48 feature/ventilating m2 285.48 to 524.11

Patent glazing; including flashings Standard aluminium georgian wired; single glazed m2 204.96 to 285.48 Standard aluminium georgian wired; double glazed m2 238.63 to 329.40

Comparitive over/underlays

Roofing felt; unreinforced sloping (measured on face) m2 1.83 to 2.39

Roofing felt; reinforced sloping (measured on face) m2 2.27 to 2.61 sloping (measured on plan) 20° pitch m2 2.61 to 3.29 sloping (measured on plan) 30° pitch m2 2.85 to 3.67 sloping (measured on plan) 40° pitch m2 3.67 to 4.11

Building paper; per m2 of roof plan area m2 1.58 to 3.29 Vapour barrier; per m2 of roof plan area m2 2.39 to 7.13 Insulation quilt; laid over ceiling joists ; per m2 of roof plan area 100 mm thick m2 5.34 to 5.68 150 mm thick m2 7.35 to 8.24 200 mm thick m2 9.79 to 10.69

Wood fibre insulation boards; impregnated; density 220 - 350 kg/m3; per m2 of roof plan area 12.7 mm thick m2 6.57 to 9.14

Limestone ballast; per m2 of roof plan area m2 7.17 to 12.30 Polyurethane insulation boards; density 32 kg/m3; per m2 of roof plan area 30 mm thick m2 10.25 to 12.30 50 mm thick m2 12.30 to 12.74

Glass fibre insulation boards; density 120 - 130 kg/m2; per m2 of roof plan area 60 mm thick m2 18.89 to 22.84

Extruded polystyrene foam boards; per m2 of roof plan area 50 mm thick m2 17.86 to 20.50 50 mm thick; with cement topping m2 28.99 to 32.79 75 mm thick m2 23.42 to 26.21

Screeds to receive roof coverings; per m2 of roof plan area 50mm cement and sand screed m2 11.86 to 13.32 60 mm (av.) 'isocrete K' screed; density 500 kg/m3 m2 12.74 to 13.76 75 mm lightweight bituminous screed and vapour barrier m2 19.91 to 22.84 100 mm lightweight bituminous screed and vapour barrier m2 24.45 to 27.23

50 mm Woodwool slabs; unreinforced Sloping (measured on face) m2 10.25 to 13.91 Sloping (measured on plan); 20° pitch m2 11.27 to 15.37 Sloping (measured on plan); 30° pitch m2 12.44 to 16.84 Sloping (measured on plan); 40° pitch m2 15.37 to 20.86

50 mm Woodwool slabs; unreinforced; on and including steel purlins at 600 mm centres m2 12.74 to 16.40 25 mm 'Tanalised' softwood boarding Sloping (measured on face) m2 17.42 to 19.91 Sloping (measured on plan); 20° pitch m2 18.89 to 21.67 Sloping (measured on plan); 30° pitch m2 22.84 to 26.21 Sloping (measured on plan); 40° pitch m2 27.23 to 29.57

18 mm External quality plywood boarding Sloping (measured on face) m2 22.11 to 26.79 Sloping (measured on plan); 20° pitch m2 24.45 to 28.40 Sloping (measured on plan); 30° pitch m2 29.57 to 35.14 Sloping (measured on plan); 40° pitch m2 35.14 to 39.53

Item Unit Range £

SUPERSTRUCTURE - cont'd

ROOF - cont'd

Comparative tiling and slating finishes/perimeter treatments (including underfelt, battening, eaves courses and ridges)

Concrete troughed interlocking tiles; 413 x 300 mm; 75 mm lap Sloping (measured on face) m2 21.08 to 26.21 Sloping (measured on plan); 30° pitch m2 27.23 to 32.79 Sloping (measured on plan); 40° pitch m2 32.79 to 36.16

Concrete troughed interlocking slates; 430 x 330 mm; 75 mm lap Sloping (measured on face) m2 22.11 to 26.79 Sloping (measured on plan); 30° pitch m2 24.01 to 33.38 Sloping (measured on plan); 40° pitch m2 32.79 to 36.75

Concrete bold roll interlocking tiles; 418 x 332 mm; 75 mm lap Sloping (measured on face) m2 21.08 to 26.21 Sloping (measured on plan); 30° pitch m2 27.82 to 32.79 Sloping (measured on plan); 40° pitch m2 31.18 to 35.58

Natural red pantiles; 337 x 241 mm; 76 mm head and 38 mm side laps Sloping (measured on face) m2 35.14 to 42.90 Sloping (measured on plan); 30° pitch m2 45.68 to 53.44 Sloping (measured on plan); 40° pitch m2 51.83 to 59.00

Blue composition (non asbestos) slates; 600 x 300 mm; 75 mm lap Sloping (measured on face) m2 36.16 to 44.51 Sloping to mansard (measured on face) m2 51.24 to 59.00 Sloping (measured on plan); 30° pitch m2 47.87 to 60.17 Sloping (measured on plan); 40° pitch m2 54.02 to 87.99

Concrete plain tiles; 267 x 165 mm; 64 mm lap Sloping (measured on face) m2 42.16 to 50.80 Sloping (measured on plan); 30° pitch m2 52.26 to 63.61 Sloping (measured on plan); 40° pitch m2 63.10 to 78.91

Machine made clay plain tiles; 267 x 165 mm; 64 mm lap Sloping (measured on face) m2 55.19 to 65.15 Sloping (measured on plan); 30° pitch m2 68.52 to 81.84 Sloping (measured on plan); 40° pitch m2 83.01 to 97.94

Welsh natural slates; 510 x 255 mm; 76 mm lap Sloping (measured on face) m2 61.20 to 79.64 Sloping (measured on plan); 30° pitch m2 79.64 to 95.75 Sloping (measured on plan); 40° pitch m2 93.55 to 102.48

Reconstructed stone slates; random lengths; 80 mm lap Sloping (measured on face) m2 38.36 to 72.47 Sloping (measured on plan); 30° pitch m2 47.87 to 93.55 Sloping (measured on plan); 40° pitch m2 56.80 to 106.87

Verges to sloping roofs; 200 x 25 mm painted softwood bargeboard; measured perimeter length 6 mm 'Masterboard' soffit lining 150 mm wide m 19.91 to 24.01 19 x 150 mm painted softwood soffit m 24.01 to 26.79

Eaves to sloping roofs; 200 x 25 mm painted softwood fascia; 6 mm 'Masterboard' soffit lining 225 mm wide; measured perimeter length 100 mm PVC gutter m 27.23 to 36.75 150 mm PVC gutter m 34.55 to 44.51 100 mm cast iron gutter; decorated m 43.48 to 51.83 150 mm cast iron gutter; decorated m 52.85 to 61.20

Item Unit Range £

Eaves to sloping roofs; 200 x 25 mm painted softwood fascia; 19 x 225 mm painted softwood soffit; measured perimeter length 100 mm PVC gutter m 32.79 to 41.14 150 mm PVC gutter m 40.70 to 49.04 100 mm cast iron gutter; decorated m 49.04 to 55.63 150 mm cast iron gutter; decorated m 57.39 to 66.32

Rainwater pipes; fixed to backgrounds; including offsets and shoe measured length of pipes 68 mm PVC m 9.52 to 13.62 110 mm PVC m 14.20 to 31.62 75 mm cast iron; decorated m 34.55 to 41.14 100 mm cast iron; decorated m 40.70 to 49.04

Ridges measured length of ridge concrete helf round tiles m 19.32 to 24.01 machine-made clay half round tiles m 24.01 to 28.40

Hips; including mitring roof tiles measured length of hip concrete half round tiles m 25.03 to 32.79 machine-made clay half round tiles m 35.58 to 40.11

Comparative cladding finishes (including underfelt, labours etc.)

0.91 mm Aluminium roofing; commercial grade flat m2 55.63 to 62.95

0.91 mm Aluminium roofing; commercial grade ; fixed to boarding (included) Sloping (measured on face) m2 58.56 to 68.81 Sloping (measured on plan); 20° pitch m2 65.88 to 76.13 Sloping (measured on plan); 30° pitch m2 79.06 to 90.77 Sloping (measured on plan); 40° pitch m2 93.70 to 102.48

Comparative waterproof finishes/perimeter treatments

Liquid applied coatings solar reflected paint m2 2.05 to 3.66 solar applied bitumen m2 8.20 to 13.32 solar applied co-polymer m2 9.66 to 14.79 solar applied polyurethane m2 15.96 to 21.67

20 mm Two coat asphalt roofing; laid flat; on felt underlay to BS 6925 m2 16.98 to 22.11 to BS 6577 m2 24.01 to 29.57 Extra for Solar reflective paint m2 2.78 to 3.95 limestone chipping finish m2 3.51 to 9.08 grp tiles in hot bitumen m2 38.36 to 47.87

20 mm Two coat reinforced asphaltic compound; laid flat; on felt underlay to BS 6577 three layer glass fibre roofing m2 22.84 to 28.40 three layer asbestos based roofing m2 28.40 to 32.79 Extra for granite chipping finish m2 3.51 to 8.93

Built-up self-finished asbestos based bitumen felt roofing; laid sloping two layer roofing (measured on face) m2 30.60 to 36.75 two layer roofing (measured on plan); 40° pitch m2 46.85 to 51.24 three layer roofing (measured on face) m2 40.70 to 49.04 three layer roofing (measured on plan); 20° pitch m2 61.20 to 67.93 three layer roofing (measured on plan); 30° pitch m2 63.54 to 70.13

Elastomeric single ply roofing; laid flat EDPM membrane; laid loose m2 26.79 to 30.60

Butyl rubber membrane; laid loose m2 26.79 to 30.60 Extra for ballast m2 8.20 to 13.32