For those looking for a wooden fence or gate post that is proven, and guaranteed, to last for 20 years there are only 2 options available. Creosote treatment is proven to work but is expensive, unpleasant to handle and as a wood preservative is likely to be phased out due to its very poor environmental credentials. This leaves only one option, which is a post treated with the current environmentally friendly wood preservative, then fitted with a Postsaver ground-line barrier sleeve. Postsaver ground-line barrier sleeves have been in production since 1994 and are proven to protect the vulnerable part of the post from ground rot - the No. 1 cause of fence post failure. Postsaver sleeves are low cost, easy to apply and supplied in sizes to fit all fence & gate posts.