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Costs: pitched and flat roofing

Davis Langdon & Everest provides supply-and-fix costs for common pitched and flat-roof specifications of tiles, slates, built-up felt, single layer, mastic asphalt and metal roofing.

The costs represent typical competitively tendered contract rates for medium-size projects in the outer London area in October 2003

TILES AND SLATES

The following rates provide comparative costs for plain areas of roofing. They include amounts for battens and standard underfelt, but exclude allowances for fittings (eg ridges and hips) and flashings.

Type Size Lap Finish Battens Plain (mm) (mm) (mm) area cost (£/m 2)Clay tiles Machine-made 265 x 165 65 Red, smooth 38 x 19 42-50 plain tiles or sandfaced Brown, smooth 38 x 19 44-52 or sandfaced Handmade 265 x 165 65 Sandfaced 32 x 25 64-74 plain tiles 100 Sandfaced 32 x 19 72-82 Interlocking 380 x 260 100 Red, smooth-faced 38 x 25 26-31 pantiles Old English 342 x 241 75 Red, smooth-faced 38 x 25 25-30 pantiles Concrete tiles Plain tiles 265 x 165 65 Smooth or 38 x 19 43-50 granular-faced Single lap interlocking tiles Flat tiles 430 x 380 75 Smooth-faced 38 x 25 19-25 Spanish 420 x 330 75 Smooth-faced 38 x 25 16-20 roll tiles Single pantile 381 x 227 75 Smooth-faced 38 x 25 19-24 Roman tiles 418 x 332 75 Granular or 38 x 22 20-25 smooth-faced Slate look-a-like 412 x 332 112 Slate, grey 38 x 25 22-27 Natural slates Spanish 600 x 300 110 Blue/black 38 x 25 43-48 Welsh blue 405 x 205 75 Riven 38 x 25 54-59 510 x 255 75 Riven 38 x 25 59-64 Westmoreland random 65 Natural green 50 x 25 135-145 sized, 305-510 long Reconstituted slates Crushed slate 300 x 336 75 Pre-weathered 38 x 25 40-45 with resin and glass slate, grey fibre reinforcement, interlocking Ground slate 600 x 300 100 Welsh grey colour, 38 x 25 38-43 and resin riven finish Fibre cement slates Rectangular, 600 x 300 100 Blue/black 38 x 25 32-37 square-edged 500 x 250 100 Matt-coated 38 x 25 35-40 slates Timber shingles Western Red 400 long, 150 Pressure 38 x 25 41-46 Cedar shingles random impregnated widths Reconstituted stone slates Concrete with 457 x 305 75 Standard colour 38 x 25 36-41 pigmented surface Flashings Lead Code 4 flashing, 100mm girth per metre 13-17 Lead Code 4 flashing, stepped, 200mm girth per metre 20-25

BUILT-UP ROOFING

FULLY SUPPORTED METAL ROOFING

The following m 2rates allow for the area of seams and rolls. The rate per m 2of roof area on plan would be 20-50 per cent higher. The rates include amounts for underlay and insulation, but exclude substrates, edge details, flashings, etc.

Fully supported metal roofing £/m 2Stucco embossed aluminium, standing seam joints 0.9mm 35-42 Pre-weathered zinc-standing seam joints 0.7mm 40-60 Terne-coated stainless steel, standing seam joints 0.4mm 40-60 Mill-finish copper, standing seam joints 0.6mm 40-50 Milled lead, lead roll joints, coated with patination oil, Code 5 2.24mm 50-80 Typical substrates:

Geotextile fleece underlay 3-4 0.7mm profiled steel liner sheets 14-17 18mm WBP plywood 16-19 Steel profiled decking 15-20 Insulation 15-20 Work to ridges, eaves and allowances for box gutters, verge flashings, etc may add 33-50 per cent to the net rates above. Work to curved structures may add 50-75 per cent to the net rates above.

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