Assessing the environmental impact of using CLT-hybrid walls as a sustainable alternative in high-rise residential buildings

Cross-laminated timber (CLT), a bio-based material, is attracting attention as an alternative to conventional materials, to reduce the environmental impact of the construction sector. To the expansion of CLT application, the environmental impact of applying CLT, which was mainly used in low- and middle-rise buildings, to the outer walls of high-rise residential building was analyzed. The environmental impacts of 28 alternative walls were analyzed based on variations in CLT thickness and insulation type. Replacing traditional walls with CLT, including finishes, alternatives resulted in an average reduction of −35% in environmental impact. According to the standardized and weighted process, cellulose and glass wool are the most environmentally friendly alternatives.