The feasibility of the use of expanded metal as metal decking in reinforced concrete slabs was investigated experimentally. 8 specimens either flat or having different corrugation geometries were tested. Flat or corrugated geometry of the specimen, strong or weak axis of expanded metal were chosen to be the variables of the test program. It was observed that the material develops excellent bond:with concrete and cracking takes place at significantly high load levels. Finite element models were set up and nonlinear analyses were carried out. The analyses results were in good agreement with the experimental data.