Grouting is one of the most popular methods used to control water leakage in dam constructions. The geological and engineering geological properties of the rock/soil to be grouted are important parameters influencing the design of the grouting. In this study, the geotechnical properties of Deriner Dam's foundation rock and the grouting procedure used for it were investigated to ascertain its suitability for grouting. Detailed investigations were conducted to unravel the reasons for and types of foundation grouting applications used on the main rock in Deriner Dam. The materials used in the grouting and the grouting pressures employed were investigated onsite, and the results obtained are presented in this paper.