Device for sealing in buildings, especially gaps between reinforced-concrete building components, is claimed where an adhesive material is applied by spreading onto the marginal zones of the component(s) near the gap, and a sealing element bridging the gap and covering the marginal zones is pressed on the adhesive. - The adhesive is permanently elastic polysulphide rubber, and the sealing element is cured, elastic, band or tape, also of a polysulphide rubber, specifically of a compsn. of such a rubber and a hardener. The polysulphide rubber is spread over a width of 10-20, (15) mm,
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