The durability of many commercial softwood timber species can be improved with the application of a wood preservative applied by an industrial process. The process involves a kilning process to dry the timber before it is loaded into a high pressure treatment plant (autoclave) where the preservative is forced into the timber cells under vacuum pressure.
Much of the decking, landscaping and cladding timber products available through trade suppliers have already been treated in this way, but to varying levels of protection.
Treatment parameters vary according to the end use of the timber. It is therefore crucial to know if the treated timber you have purchased is fit for its intended purpose.