Abstract: The present invention relates to a means for and a method of sealing constructions. In order to provide a means for and a method of sealing constructions which permits flexible, inexpensive and permanent sealing of new and already existing constructions, with a high degree of sealing integrity, by introducing a core sealing means, it is proposed in accordance with the invention that the means for sealing constructions comprises a mixture of soil, preferably argillaceous materials and/or coarse clay, and an additive for breaking open the enclosing water around the grain. In regard to the method it is proposed that the mixture of soil and an additive is injected into the construction or is sprayed on at the surface.