Timber has a large selection of species that are naturally durable and do not need any additional preservative treatments to make them resistant to biological decay. The vast range is available in many hardwoods and modified species ( including softwoods like Siberian larch and imported western red cedar). If choose a non-durable species, e.g….

To be able to answer the question you need to know, the timbers durability class as given in BS EN350-2, you also need to know the Use class of the timber given in BS8417 all explained below.Biological performance is based on the resistance to microbiological attack of a species heartwood. Standards or reference documents used…

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