The sealing tape comprises at least one base body of flexible foam capable of recovery after compression. In the area of the bottom surface of the sealing tape, an adhesive layer for bonding to a frame profile of a window or door is arranged. The sealing tape comprises a continuous barrier structure for reducing the permeability to the diffusion of water vapor and/or the permeability to air in the functional direction of the sealing tape, wherein the barrier structure extends from the top surface to the bottom surface and also extends over an area of the top surface. The barrier structure comprises, at least in the area of the top surface, a closed-cell flexible foam or consists of closed-cell flexible foam. The barrier structure, at least in the area of the top surface of the sealing tape, has a thickness of between 10 μm and 5 mm.