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Specification options
Steelwork exposed to atmosphereCapital cost £/m²Lifecycle cost for 50 or 120 years £/m²Period to first major maintenance years
Category 4: 50 yearsÌýÌýÌý
Hot dip galvanized to BS EN ISO 1461 mean coating thickness 85µm354280
Epoxy micaceous iron oxide (MIO) finish: 100µm; Zinc phosphate epoxy primer: 80µm. Steel: blast cleaned to Sa 2.5226120
High solids polyurethane finish:100µm. inc phosphate epoxy primer: 100µm. Steel: blast cleaned to Sa 2.5174820
Category 5: 120 yearsÌýÌýÌý
Hot dip galvanized to BS EN ISO 1461 mean coating thickness 85µm354380
Hot dip galvanized mean coating thickness 140µm includes shotblast preparation5058120
Epoxy micaceous iron oxide (MIO) finish: 100µm; Zinc phosphate epoxy primer: 80µm. Steel: blast cleaned to Sa 2.5227320
High solids polyurethane finish:100µm. Zinc phosphate epoxy primer: 100µm. Steel: blast cleaned to Sa 2.5175720
Table notes: External environment category C3 to ISO 9223, Average annual zinc corrosion rate: 1µm/yr. First protective system factory applied. Subsequent coating assumed at 8-10 year intervals including allowance for treating corosion and quinquennial inspections. Dimensions refer to dry film thicknesses. Discount rates of 3.0% (50 years) and 2.5% (120 years) are used to calculate net present values. There are a huge range of alternative coating systems; costs and options are indicative. Use specialist advice for suitable options and a cost analysis based on project specific information for a realistic best value appraisal