Bamboo has been widely used in Japan for daily necessities, furniture, and construction materials. Still, demand for bamboo in has been reduced as it has been replaced by inexpensive imported from overseas and cheap, easy-to-process plastics. As a result, social issues such as the erosion of mountains by abandoned bamboo forests, forest degradation, and animal damage are spreading across the country. This new project to use bamboo as a structural material for construction is an attempt to solve these problems, realize a decarbonized society, and create regional revitalization.
Bamboo is stronger than cedar but is not a building material according to existing Japanese building codes. Therefore, it took two years to develop Japan's first bamboo laminated timber as a structural system. After strength tests of the joints, we obtained a performance evaluation certificate for the bamboo laminated timber structure. Projects are underway for a one-story retail shop in Kagoshima Prefecture, which has the largest area of bamboo forests in Japan.
Bamboo proliferates and can be used as a building material in three to five years and cycles more quickly than coniferous timber, which takes about 40-60 years. It also does not need to be planted due to its characteristics as an underground stem. Therefore, it is a building material that can be supplied stably and can potentially compensate for timber shortages. In addition, bamboo only absorbs CO2 for about one year; however, it circulates in a short period of time; therefore, the more it is used, the more it can contribute to the realization of a decarbonized society. Furthermore, as bamboo is found throughout Japan, with the exception of parts of northern Japan, it can be consumed as a building material for local production for local consumption, leading not only to the revival of the defunct bamboo industry, but also to the development of a high value-added industry and job creation.
The implementation of this project will help bamboo construction to spread both domestically and internationally and help achieve the SDGs.