“Pre-engineered steel buildings” are those which are fully fabricated in the factory after designing, shipped to site in CKD(completely knocked down) condition; and all components are assembled and erected at site with nut-bolts, thereby reducing the time of completion. Pre–engineered means, generally speaking, is any part of a structure that is manufactured prior to its arrival on the building site. The concept of the pre-engineered building (PEB) is one where the fabrication is completed in a controlled environment with the latest technology, and then subsequent erection is carried out. Though initially only off the shelf products were available in these configurations aided by the technological development tailor made solutions are also made using this technology in very short durations. The designs were ready-made but the building components were either ready-made or manufactured against specific orders. These buildings were pre-designed or ‘pre-engineered’ into standard sizes, spans, bays and heights, and use standard details for fixing cladding, roofing, gutters, flashing, windows, doors etc taking advantage of industrial practices of mass production of components economically.