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Almost all of our timber can be UC4 treated. UC4 treatment is a more in-depth treatment than standard tanalisation. The timber is kiln-dried prior to treatment to reduce the moisture rates within the wood to be around 28%. This drying stage helps promote the wood to absorb more of the preservative and ensures that the posts have a much higher resistant to damp and rot. The wood is then pressure treated with the preservative. Please note that this timber is only available upon request and minimum order quantities will apply. Please contact us directly for more information.