In this project work it is proposed to carry out the design of an industrial steel storage shed. The four requirements named as Utility, safety, economical and elegance must be fulfilled for a structural design to be satisfactory. This project presents a study on behavior and economy of roof trusses columns and purlins by comparison of limit state and working stress method. Roof trusses and purlins are integral part of an industrial building. This project presents a study on behavior and economical of fink type roof trusses, beam section purlins by comparison of limit state and working stress method. This study involves in examination of theoretical investigations of specimens in series. Overall two methods were designed and comparison of all the internal force, economical, and hence, to evaluate the co-existing moments and shear forces at the critical cross-section with same configuration area by keeping all other parameters constant. The theoretical data are calculated using Indian Standard code IS 875-1987 (part I), IS 875-1987 (part II), IS 875-1987 (part III), IS 800 – 2007 using limit state method, IS 800- 1984 using working stress method and the section properties of the specimens are obtained using steel table. The project aims to provide which method is economical, high bending strength, more load carrying capacity and high flexural strength. The studies reveal that the theoretical investigations limit state method design is high bending strength, high load caring capacity, minimum deflection and minimum local buckling& distortional buckling compare to the working stress method.