Influence of hydrophobic additives on resistance to alkali environment is described in this paper. This article is focus on surface properties of vibropressed concrete connected with hydrophobicity. The aim of the testing was in description of influence of several types of hydrophobic additives, which were applied either to the interior structure or either as a coating on the surface of the element. In some cases, it was a combination of both. The article is about specific measurement of resistance against alkalis. Higher resistance to alkali and therefore better durability properties show samples with hydrophobic coating than with inner additives. All the samples with inner impregnation exceeded its permitted limits established for the alkali resistance multi-times. Measurement involves not only resistance to alkalis but also tests of frost resistance and water absorption depending on time.