Sealing element

A sealing element for sealing fastening element holes in water-impermeable sealing layers of a structure has a cap-shaped receiving space for receiving curable compound exiting from the borehole and extending between a contact area provided for contacting the water-impermeable sealing layer, and a flange area spaced from the latter, with the outer diameter (C) of the receiving space at the contact area corresponding to from two-times to six-times the inner diameter (D) of a through-opening which is formed in the flange area and is surrounded by springing blades projecting into the through-opening for a clamping engagement with the fastening element.