Costs: Roof coverings | Features

Fully-supported metal sheet roof coverings – lifetime costs
Component description	Capital and lifetime costs
Stainless steel sheet
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
	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
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
Zinc sheet to BS EN 988, zinc-copper-titanium alloy, minimum 0.8 mm thickness, concealed fixings.	Capital cost £65/m
	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
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
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