The main emphasis of this brief guide is to understand the issues relating to treatment in weather exposed applications. This Guide will briefly look at some theory relating to timber treatment and show the requirements of AS1604.1. This is followed by a more detailed look at practical matters associated with treatment and includes discussion about whether much of the Standard that specifiers rely on can actually be achieved. My concern has been that the designer is left with a sense of false security as on many occasions "preservation" of sawn timber simply has not been achieved. The Guide concludes with a number of case histories where what is learnt about preservation and natural durability throughout the following pages is applied to difficult durability applications.
About the Author: Ted Stubbersfield was born in the small Queensland town of Gatton in 1950. After studying to be a pastor in Brisbane and the UK he returned to the family business, Gatton Sawmilling Co. A fair question would be, can anything good come out of Gatton? Well, Gatton was the home of a Governor General of Australia (William Vanneck 1938). It is also the home of the best and most innovative hardwood producer in Australia, Outdoor Structures Australia (OSA). The family had been involved in sawmilling and building for about 140 years and a lot of knowledge has passed through the generations. In 1985 we ventured into the footbridge market (almost by accident) and then followed public landscaping. Initially we just did as we were told by consultants who knew very little about timber. In about 1988 Ted decided he would come to know the medium he was working with far better than any of his competitors and most of the professionals who used his products. Ted realised that there were no useful standards and guides for designing and building weather exposed timber structures such as boardwalks. That led in 1997 to his first formal research project on boardwalk design, engineering supply and construction. Over the years there followed a complete set of guides. These allowed professionals to design timber structures of exceptional beauty and durability. Typically, everybody wants to re-invent the wheel and the guides were usually ignored. Invariably, the same mistakes keep being made over and over. This little book is an attempt to remedy this. In 2012, the time came to close the manufacturing arm of OSA and to take on a less stressful lifestyle. Ted plans to put in writing much of what he has learnt so the industry does not have to relearn it. This book is the first in a series of Timber Design Files that are intended to allow designers avoid the pitfalls of common but often bad practice and Standards that are very inadequate and engender a false sense of security.