Effect of Steel Deck Flooring in Moment Resisting Steel Frame Engr. Renato Tandoc, MSCE Major in Structural Engineering1, Florante G. Aliga Jr.2, Mark Jemuel G. Alilis3, Jayson A. Arbenio4, Ace Vanlee P. As-il5, Romel C. Lacaden6, Yenko L. Tandoc7, Jefferson A. Urbano8 1 Department of Civil Engineering Saint Louis University, Baguio City Contact information: 2aligaflorantejr@gmail.com; 3mjgalilis@yahoo.com; 4 jayson_arbenio@yahoo.com; 5ace_vanlee99@yahoo.com; 6rlacz_557@yahoo.com; 7 yen.xin_tan@yahoo.com; 8gamerjefferson@yahoo.com Abstract: Concrete slab and steel deck flooring differs from one another in terms of their effects on structural design. In this present study, an attempt was made by studying the comparison between the design results of a mid-rise moment resisting steel frame from two structural analysis using steel deck and concrete slab separately. The aim of the analysis is to determine the difference in the building’s material weight and the base reaction of the structure from the two analysis. Significantly, this study aims to provide additional information about the comparison between the two flooring materials. Design results show that there is a negligible difference between the two separate analyses since there is only a 3.28% and 4.72% difference in base reaction and building weight respectively. Keywords: ETABS, Concrete Slab, Composite Steel Deck, Frame Weight, Base Reaction