The present invention relates to cementitious materials, which exhibit a hydrophobic character, and to a process for making cementitious materials hydrophobic, and to a granulated additive for rendering cementitious material hydrophobic. An emulsifier for the organosilicon component is deposited on the particulate carrier together with the organosilicon component and the binder. The hydrophobing agent permits to impart instantaneous hydrophobicity to cementitious materials.