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Timber cladding
ÌýCapital cost £/m2Net present value for 60 years £/m2Service life years
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Timbers not requiring treatment, heartwood onlyÌýÌýÌý
Western red cedar thuja plicanta finished size 18 mm thick and 125 mm exposed face385040-60
European larch larix decidua finished size 21 mm thick and 135 mm exposed face324730-40
Douglas fir pseudotsuga menziesii finished size 19 mm thick and 125 mm exposed face355825-35
European oak quercus robur finished size 19 mm thick and 125 mm exposed face, screw-fixed465940-60
Treated timbersÌýÌýÌý
European redwood pinus sylvestris heat-treated finished size 25 mm thick and 125 mm exposed face284825-35
Lodgepole pine pinus contorta finished size 16 mm thick and 125 mm exposed face. Preservative treated and precoated high performance paint system327025-35
European whitewood picea and abies species finished size 19 mm thick and 120 mm exposed face. Preservative treated. Paint or stain finish2319020-30
Table notes
A discount rate of 3.5% is used to calculate net present values. Service lives are an average
All finished naturally and fixed using stainless steel nails, unless otherwise stated
Costs are based on 100m2 external wall, vertical cladding and include replacement, maintenance, allowance for minor repairs and repainting
Recoating cycles depend on the rate deterioration of the protective film. Typically repainting is carried out every two to five years; longer for high-performance paint systems
A cost analysis based on project-specific information is essential for a realistic best-value appraisal
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Further information
ºÚ¶´ÉçÇø LifePlans provide latent defects warranty for buildings
See www.componentlife.com for building component durability information
For more information email peter.mayer@buildinglifeplans.com or telephone 020-7204 2441