The purpose of the present study is to investigate an effect of the rubber-latex mortar which is sprayed on the surface of steel of the continuous composite girders. There are few examples that rubber-latex mortar is sprayed on all over the steel. In order to investigate the effect of the rubber-latex mortar, the results of static load tests for the models with the rubber-latex mortar coating are compared with those of the models without the rubber-latex mortar coating. From this study, it is concluded that the rubber-latex mortar coating improves the slip resistance between steel and concrete.