The Pressure Treatment process for timber has been applied to products for a number of years; the key benefit of this process is that the preservative is forced under vacuum pressure right deep into the heart of the wood and the grain structure. The preservative becomes an integral part of the wood; giving the product a longer life and protection against rot.
This process also means that you never have to apply preservatives to your fence or garden structure, and it allows the natural colours of the timber to show through and so your fence blends easily within your garden. Surprisingly, Pressure Treated fences and garden structures are only slightly more expensive than Dip Treated options.