There are two ways to specify treated wood – 1. by referring to the British Standard BS8417 or 2. by using the Wood Protection Association (WPA) commodity code system : Option 1: Using reference to the British Standard The British Standard for wood preservation is BS8417. This code of practice defines treatment by preservative penetration…

  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….

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