Lifetime costs: Full metal packet | Features

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 £61/m²
	Net present value for 60-year life £61/m²
	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 £56/m²
	Net present value for 60-year life £56/m²
	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 £60/m²
	Net present value for 60-year life £63/m²
	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 £58/m²
	Net present value for 60-year life £66/m²
	Service life 35 years
Lead sheet
Rolled lead sheet to BS EN 12588, code 5, 6 or 7, minimum 2 mm thickness.	Capital cost £63/m²
	Net present value for 60-year life £63/m²
	Service life 60 years
Zinc sheet
Zinc sheet to BS EN 988, zinc–copper–titanium alloy, minimum 0.6 mm thickness.	Capital cost £48/m²
	Net present value for 60-year life £54/m²
	Service life 35 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 £55/m²
	Net present value for 60-year life £55/m²
	Service life 60 years
Table notes
Lifetime costs reflect typical increases in material costs and market conditions.
British standards have been superseded by European standards. A series of European standards cover fully supported roof products for pitched roofs – BS EN 501 for zinc, 502 for stainless steel, and 504 for copper. These define material qualities, tolerances, coatings, finishes and quality assurance.
Ferritic stainless steels, aluminium alloys, mild steel sheet coverings and metals with coatings are excluded.
Costs relate to the covering material; the substrate has been excluded.
Costs include initial supply and installation, plus removal and replacement at end of service life.
No maintenance is required and no repair costs are included.
Costs are discounted to net present values at a discount rate of 6%.