The timber is slow grown Northern European Pine is the ideal species for this pressure treatment process, allowing the treatment to penetrate deep into cells of the wood and achieve the criteria set within the BS8417 (British Standard) treatment guidelines for the 15-year warranty. Tanalised UC 4 - These ground contact timbers are produced by carefully selecting Pine softwood (Redwood – species Pinus Sylvestris) which has been either air dried/seasoned or kiln dried to a moisture content of 28% or below. We recommend these posts for temporary fencing only.
Tanalised UC 3.2 - These posts are normally mixed species or spruce. fence postsĪs a result of this, we offer ground contact timbers in 3 differing formats to try to cover different budgets and applications. decorated claddingĭirect contact with soil or freshwater e.g. Which Use Class to use CLASSĬoated above ground e.g. (An exception to this would be incised timber.) After 15 years of research and development, there is now a classification table to guide and assist in purchasing of treated timber. It is now known that the use of mixed species timber for ground contact is not viable due to the uptake of the tanalising fluid by the cell structure of the timber. This had a detrimental impact on the fencing industry, as it was unknown at the time what the results of the new treatment would be. A guide to choosing the right timber for your job.Īs of June 2004, CCA (copper, chrome, arsenic) treated timber was banned by the European Commission (directive 76/769/EEC).
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