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The sandwich structure as a substitute for the conventional structure in the ship was an interesting topic in this recent era. Various innovation of type and shape of the core was studied with many researchers. Resin-talk-catalyst combination is one of cores type that has a high opportunity to research deeply and to applicate massively. The effect of roughness surface on the bending properties and failure mechanism of sandwich structure by using resin-talk-catalyst as the core and steel as the face was investigated in this paper. The four-point bending test of the sandwich structure was performed at three variations resin-talk-catalyst composition and two variations of with and without roughness surface in order to understand the deformation and failure mechanism. The effect of roughness on deformation modes, failure mechanism, and bending failure load was studied and analyzed. The result showed that the roughness surface and various type of core combination has a visible impact on the deformation modes, failure mechanism, and bending failure load. The roughness surface sandwich structure was stiffer and stronger than non-roughness surface sandwich structure.