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![]() Title:Multi-criteria Evaluation of CLT Floor Assemblies: Life Cycle Impacts, Acoustic Performance, Design Parameters, and Reuse Potential Authors:Ashley Juraschka, Mathew Song, Joyce Kim, Carl Haas, Aryan Hojjati, Jun Ahn and Mehdi Ghobadi Conference:Joint CSCE Construction Specialty - CRC 2025 Tags:Acoustic Performance, Circular Economy, Cross-Laminated Timber, Floor Systems, Holistic evaluation, Life Cycle Analysis, Modular, Multi-criteria decision making, Off-Site Construction, Residential, Structural Efficiency and Structural Reuse Abstract: Cross-laminated timber (CLT) offers considerable potential in decarbonization of the built environment by enhancing construction efficiency and productivity through offsite construction and providing carbon storage benefits in Life Cycle Analysis (LCA). In multi-unit residential buildings (MURBs), suboptimal acoustic performance of Mass Timber poses design challenges. Integration of acoustic dampening layers, increases material use, embodied carbon, and assembly weight. Floor thickness and reuse potential are also affected. In LCA studies, these complexities are inconsistently accounted for. A holistic evaluation integrating environmental, acoustic, and reuse metrics is needed to address this gap. Accordingly, this study evaluates four typical CLT floor assemblies – (1) concrete topping with acoustic mat, (2) concrete composite floor, (3) acoustic products without concrete topping, and (4) raised access floor – using a cradle-to-cradle approach. Tally® LCA was used for environmental impact assessment, supplemented by manufacturer Environmental Product Declarations (EPDs) where data gaps existed. Sound transmission class (STC) and impact isolation class (IIC) data from studies by WoodWorks Wood Products Council was used to assess acoustic performance. Design parameters, including assembly weight, and thickness, were also evaluated. Reuse potential of structural elements was evaluated based on disassembly potential. Findings of this study indicate that substituting concrete toppings with raised access floor systems reduces embodied carbon by up to 64%, without compromising acoustic performance. These substitutions also reduce assembly weight, enabling the use of lighter structural members. Mechanically fastened acoustic layers improved reuse potential by simplifying disassembly. This research highlights the importance of holistic evaluations to inform the optimized design and application of CLT floor systems. Multi-criteria Evaluation of CLT Floor Assemblies: Life Cycle Impacts, Acoustic Performance, Design Parameters, and Reuse Potential ![]() Multi-criteria Evaluation of CLT Floor Assemblies: Life Cycle Impacts, Acoustic Performance, Design Parameters, and Reuse Potential | ||||
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