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| Fully-supported metal sheet roof coverings – lifetime costs | |
| Component description | Capital and lifetime costs |
| Stainless steel sheet | Ìý |
| Austenitic stainless steel to BS EN 10088-2, grade 1.4401 (UK type 316), minimum 0.38 mm thickness, terne coated. | Capital cost £68/m |
| Net present value for 60-year life £68/m | |
| Service life 60 years | |
| Austenitic stainless steel to BS EN 10088-2, grade 1.4401 (UK type 316), minimum 0.38 mm thickness. | Capital cost £63/m |
| Ìý | Net present value for 60-year life £63/m |
| Service life 60 years | |
| Austenitic stainless steel to BS EN 10088-2, grade 1.4301 (UK type 304), minimum 0.38 mm thickness, terne coated, minimum 15 micron thickness. | Capital cost £67/m |
| Net present value for 60-year life £80/m | |
| Service life 50 years | |
| Austenitic stainless steel to BS EN 10088-2, grade 1.4301 (UK type 304), minimum 0.38 mm thickness, terne coated, less than 15 micron thickness. (Not suitable for use in exposed marine or aggressive industrial atmospheres). | Capital cost £65/m |
| Net present value for 60-year life £86/m | |
| Service life 35 years | |
| Lead sheet | Ìý |
| Rolled lead sheet to BS EN 12588, code 5, 6 or 7, minimum 2 mm thickness. | Capital cost £70/m |
| Net present value for 60-year life £70/m | |
| Service life 60 years | |
| Zinc sheet | Ìý |
| Zinc sheet to BS EN 988, zinc-copper-titanium alloy, minimum 0.8 mm thickness, concealed fixings. | Capital cost £65/m |
| Ìý | Net present value for 60-year life £65/m |
| Service life 60 years | |
| Zinc sheet to BS EN 988, zinc-copper-titanium alloy, minimum 0.7 mm thickness, concealed fixings. | Capital cost £60/m |
| Net present value for 60-year life £71/m | |
| Service life 55 years | |
| Zinc sheet to BS EN 988, zinc-copper-titanium alloy, minimum 0.7 mm thickness, through fixed. | Capital cost £58/m |
| Net present value for 60-year life £83/m | |
| Service life 30 years | |
| Copper sheet | Ìý |
| Annealed copper sheet to BS EN 1172, grade Cu-DHP, temper R220 (soft) or R240 (half hard), minimum 0.5 mm thickness. | Capital cost £70/m |
| Net present value for 60-year life £70/m | |
| Service life 60 years | |
| Roofing costs | ||
| Indicative inclusive rates for various types of roofing, representing national average contract rates in the third quarter of 2004. Figures allow for roofs of low to average complexity and allow for eaves, verges, abutments and other edge details. Rates do not include for associated flashings or rainwater goods. All rates are based on slope (not plan) area. | ||
| Description | unit | Range (£) |
| Metal profiled / flat sheet roofing (including purlins) | ||
| Medium quality coated aluminium or steel trapezoidal built-up roofing | Ìý | Ìý |
| system, sandwich liner system, vapour control barrier and insulation | m2 | 25-35 |
| Composite fully insulated coated aluminium or steel trapezoidal roofing system | m2 | 47-70 |
| Tiling / slating (including underfelt & battens) | ||
| Concrete interlocking tiles | m2 | 26-34 |
| Clay pantiles (machine made) | m2 | 36-47 |
| Profiled steel multi-tiles | m2 | 35-45 |
| Man made slates | m2 | 45-60 |
| Clay pantiles (hand made) | m2 | 60-80 |
| Natural slates (Welsh) | m2 | 75-100 |
| Asphalt and single ply flat roofing (including insulation & vapour control barrier) | ||
| Single layer polymer roofing membrane | m2 | 50-70 |
| 20 mm thick Two coats asphalt roofing, including felt underlay | m2 | 55-75 |
| Capital costs for other roofing types supplied by Davis Langdon | ||
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