The detailed CAD drawing of the iron flower trellis on the roof includes precise dimensions, specifications, and structural elements of the trellis. It provides a comprehensive representation of the design, featuring the arrangement of the iron framework, decorative patterns, and attachment points on the roof. Additionally, the drawing may include annotations, labels, and notes specifying materials, construction methods, and any additional features or modifications required for installation. Overall, the CAD drawing serves as a valuable reference for architects, engineers, and contractors involved in the fabrication and installation of the iron flower trellis, ensuring accuracy and adherence to design specifications.