The objectives of this project were to assess the performance of heat treatmenttechnologies, and to determine the properties of jack pine and balsam fir after heat treatment for exterior applications. Industrial heat treatment involves heating wood to 150oC to 240oC while preventing it from burning. This is achieved by heating the wood in either an inert atmosphere or saturated vapour environment. Heating the wood over 200oC changes the chemical structure of the wood and results in a reduction in its hydrophilic behaviour. After heat treatment when wood colour has changed to brown, dimensional stability and biological durability improves but some mechanical properties may decrease. This enhanced dimensional stability and biological durability make heat treatment an interesting option for the protection of wood used in exterior applications. Due to delays, no testing work was completed. The testing will be done and reported under a new project titled Control and Certification of Thermally Modified Wood.