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Eaves gutter and downpipe rainwater drainage systems | Capital cost £/m | Net present value for 60 years £/m | Expected service life |
Cast iron | Ìý | Ìý | Ìý |
Cast-iron 100mm half round eaves gutter to BS 460 | 28 | 85 | %3E60 |
Cast-iron 63mm round downpipe to BS 460 | 44 | 76 | %3E60 |
Aluminium | Ìý | Ìý | Ìý |
Cast aluminium 100mm half round eaves gutter | 30 | 89 | 40 - 60 |
Cast aluminium 63mm round downpipe | 36 | 72 | 40 - 60 |
Plastics | Ìý | Ìý | Ìý |
PVC-U 114mm half round eaves gutters to BS EN 607 | 17 | 88 | 20 - 30 |
PVC-U 68mm round downpipe to BS EN 12200-1 | 18 | 65 | 20 - 30 |
Table notes: A discount rate of 3.5% is used to calculate net present values. Linear metre rate based on simple eaves gutter run to include stop ends and outlet, downpipes with shoe and offset bends, all fixings included. Life cycle costs include servicing, inspection and allowance for repairs. Redecoration for cast iron and aluminium systems. Average service lives used in calculations. A cost analysis based on project specific information is essential for a realistic best value appraisal. BLP provides latent defect warranties for buildings www.blpinsurance.com For durability information contact: peter.mayer@blpinsurance.com or telephone 020-7204 2450 |
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