In years, the need for environmental consideration has been reaffirmed worldwide, and in Japan too, there is a demand for the expansion of the uses of wood in order to achieve a decarbonised society. So, there is also a need to develop and improve wood preservation treatment methods that overcome the weaknesses of wood and enable it to be used in a wide range of applications. The authors have improved the dry-treatment technology, which is a pressure treatment method that does not use water, and have established technology for solvents, wood preservatives, and treatment processes. In this context, the “Act on the Promotion of Housing Quality Assurance” was enacted to promote the use of wood, and there is now a lot of interest in engineered wood products such as glued laminated timber (GLT), laminated veneer timber (LVL) and plywood, as well as sawn timber. In response to this, the authors conducted adhesion strength tests, dimensional change measurements between before and after dry-treatment, and durability tests assuming the foundation environment of conventional construction methods to evaluate dry-treating engineered wood. As a result, it was found that the dry treatment has almost no effect on the adhesive strength of the engineered wood, that there is little dimensional change before and after treatment, and that the durability test assuming a foundation environment has maintained soundness for 20 years. This means that dry-treatment can be introduced not only to lumber, but also to engineered wood, and it will be possible to respond to more consumer needs.

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