Roof of library sections and constructive structure cad drawing details that includes a detailed view of Connection Details of Purlin to Rafter and Truss 2 Details with Galva Metal Support Layout of Roof Truss details, Gusset Plate Thick on Both Sides Bolts Grade details, Verandah & Staircase, Fixing Detail of Metal Sheet to Purlin with Fixing Details of Purlin on Beam Details Details of Purlin to Rafter with Zinc Aluminium and much more of roof details.