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Purpose: As the construction industry accounts for a significant portion of global carbon dioxide emissions, the importance of reducing carbon emissions through the remodeling of existing buildings is being emphasized. This study proposes a method to evaluate the greenhouse gas emissions of each building material in the remodeling process of existing buildings by integrating BIM and LCA, and visualizing this in a BIM model. Method: Using BIM models, the quantity and cost of each material are calculated, and the greenhouse gas emissions are evaluated through LCA. Then, these are visualized in the BIM model using a Dynamo-based parametric algorithm. This study analyzed the total greenhouse gas emissions of five types of exterior materials, including the existing exterior material, through a case study. Result: The study results showed that stucco has the lowest greenhouse gas emissions, while exposed concrete has the highest. This suggests that remodeling with stucco could be an effective strategy to minimize greenhouse gas emissions when considering the entire life cycle of a building. Additionally, the process of visualizing the environmental impact of each exterior material in the BIM model, where the colors of BIM objects change automatically based on their impact, provides a way for even non-experts to easily understand LCA data. This approach can significantly contribute to the selection of sustainable building materials and the improvement of environmental impacts of buildings.
Kim et al. (Wed,) studied this question.