BIM plays a critical role in modern engineering by enabling precise 3D modelling, better coordination, and reduced design conflicts. By integrating data across disciplines, BIM helps teams identify issues early and deliver accurate, execution-ready output. Proper purlin selection also contributes to faster installation and reduced construction time. It minimizes the need for additional supports and rework during execution. Overall, the right purlin choice plays a key role in achieving efficient, reliable, and optimized structural design.