Grouting works on dams require custom-made grout compositions, depending on the application conditions and purpose. Whilst in granular deposits grouts of pronounced ﬁltration stability are a must, weakly stabilized mixes are not uncommon for closure of ﬁssure cracks in rocks. In the last decades however, the increased application of the GIN method in rock grouting, has raised the importance of stabilized grouts for sealing of rock cracks and apertures as well. In ﬁne-granular soil chemical grouting with resin and gel solutions is usually a better choice. Depending on the required mechanical properties, the durability and exposure conditions, choice can be made between soft, hard gels and polyurethan resins. Meanwhile, chemical grout control agents, such as polymers, have found application in conventional rock grouting as well. One of the main advantages of the grouting methods, besides the preservation of soil in place, just sealing the cracks and voids with wide-spread grouts, are the limited dimensions of utilized equipment. The lower portion of material demand is a further decisive factor, making grouts an economically attractive solution.