The objective of this report is to review published research and provide an overview of the available technology for improving the properties of OSB. Computer searches were made of Agricola, Chemical Abstracts, CAB Abstracts, PCForest and TreeCD. In addition, lists of reports were requested from research groups known to have worked in the area. This report deals first with alternative treatment processes and their effects on the physical properties of the board and second with the performance of the treated products. The second section discusses only those treatments which had acceptable effects on board properties. In terms of practicality, economics and optimum physical properties of the finished board, the best treatments appear to be powder or concentrated liquid additives at the blender using certain combinations of preservative and adhesive. Borates are effective for protection against decay and termites in applications protected from the weather such as sheathing. As yet, no treatment has been developed which will provide long-term performance in ground contact. For fire retardant performance vapor boron treatment of the finished panel may be the best option. Further work is required on processes to improve dimensional stability of OSB.