Design and Evaluation of Modular Prefabricated Building Facades for Sustainability

Thesis Abstract

The increasing demand for sustainable construction practices has prompted a critical examination of building envelope systems, particularly the design and implementation of prefabricated façades that can significantly reduce environmental impact, construction time, and lifecycle costs. Despite the potential advantages, current prefabricated façade solutions often face challenges related to durability, thermal performance, and aesthetic integration, which hinder their widespread adoption and sustainability credentials. This study aims to develop a comprehensive design framework and evaluate the sustainability performance of modular prefabricated building façades to address these challenges, thereby contributing to the advancement of environmentally responsible construction methods. The specific objectives include (1) analyzing existing prefabricated façade systems and identifying design features that influence sustainability; (2) proposing an optimized modular façade design that enhances thermal insulation, material recyclability, and construction efficiency; (3) assessing the environmental and economic impacts of the proposed design through life cycle assessment (LCA) and cost-benefit analysis (CBA); and (4) evaluating stakeholder perceptions and operational performance through empirical surveys. The research adopts a mixed-methods approach, integrating qualitative and quantitative techniques to comprehensively address the research questions. A descriptive and exploratory research design is employed to analyze existing literature, conduct experimental prototyping, and evaluate the proposed façade design. The philosophical paradigm underpinning the study aligns with pragmatism, emphasizing practical solutions and stakeholder relevance. The population includes architectural firms, construction practitioners, and building occupants involved in façade design and installation. A purposive sampling technique is used to select 15 architectural firms and 5 construction sites for case studies, along with 200 building occupants surveyed via structured questionnaires. Data collection instruments comprise standardized checklists for façade system analysis, 3D modeling software for design simulation, and structured questionnaires for stakeholder perceptions. To ensure validity and reliability, the instruments are pre-tested, and triangulation is employed during data collection. Data analysis involves multiple techniques, including descriptive statistics (means, standard deviations) for stakeholder surveys, regression analysis to examine relationships between design variables and sustainability indicators, and thematic analysis of qualitative interview responses. The study employs a Life Cycle Assessment (LCA) framework based on ISO 14040/44 standards to evaluate environmental impacts, while a cost-benefit analysis evaluates economic feasibility, incorporating data from the case studies and simulations. The analytical framework integrates the Theory of Planned Behavior (TPB) to interpret stakeholder attitudes and the Diffusion of Innovation Theory to understand the adoption potential of the proposed façade system. Anticipated findings include identification of key design parameters influencing the sustainability performance of modular façades, evidence of reduced environmental impacts associated with the proposed design, and insights into stakeholder perceptions that facilitate wider adoption. It is expected that the optimized façade system will demonstrate measurable improvements in thermal efficiency (at least 20% enhancement), recyclability (up to 95% of materials), and construction time reduction (by 30%) compared to conventional solutions. The economic analysis is projected to reveal a payback period of less than five years, affirming financial feasibility. This research makes a significant contribution to existing knowledge by providing an integrated design framework, empirical evaluation data, and a replicable methodology for sustainable facade development. The findings offer practical implications for architects, engineers, and policymakers aiming to promote eco-friendly building practices. The study concludes that modular prefabricated façades, when meticulously designed and evaluated through sustainable metrics, can markedly advance green building initiatives. Recommendations include adopting the proposed design for pilot projects, establishing standardized testing protocols, and fostering stakeholder engagement strategies to enhance acceptance. Future research directions suggested involve long-term performance monitoring and exploring material innovations to further optimize sustainability outcomes in prefabricated façade systems.