The invention relates to a means and a method for sealing constructions. The aim of the invention is to provide a means and a method for sealing constructions, which enable novel and already existing constructions to be permanently sealed in a flexible, high-quality and economical manner, by introducing a core sealing element. To this end, the means for sealing constructions consists of a mixture of soil, preferably argillaceous materials and/or coarse clay, and an additive which breaks open the water surrounding the grain. According to the inventive method, the mixture of soil and additive is sprayed into the construction or over the surface thereof.