Abstract: Structures built by cold-formed segments of primary members secondary members and roof panels provide a different solution for a great variety of areas such as housing, storage, education, etc The design of cold-formed sections has obvious complexity in view of the buckling of sections vis-à-vis stress in the compression element, especially in flexure. In this study, effective section properties of the Z section are calculated for a wide range of configurations with different b/t ratios for flange subjected to maximum allowable stress. The section properties are being used to develop the optimum section configurations for constructing a structure in different regions. . The study gives different formulae for quick assessment of parameters and also presents simple design tools and a few standard cold-formed sections having similar configuration but for thickness to be used for residential or community shelters for different zones. Recourse is made to compare the results with similar studies using AISI code and compare the results of lapped purlin and purlin without laps design. The whole course is mainly focused on analyzing and designing cold-formed section purlin.