A sealing tape roll of a sealing tape of flexible, compressible foam having at least one interior barrier layer; wherein the sealing tape comprises a top surface, a bottom surface, two side surfaces (10, 12) connecting the top surface and the bottom surface to each other, a longitudinal direction, which is parallel to the bottom surface and to the side surfaces (10, 12), and a thickness direction, which is perpendicular to the bottom surface of the sealing tape; wherein the sealing tape is wound up into the sealing tape roll around an axis, which is arranged transversely to the longitudinal direction of the sealing tape, in such a way that the top surface of one turn rests against the bottom surface of an adjacent turn of the sealing tape roll, and the side surfaces (10, 12) of the sealing tape form end surfaces (16, 18) of the sealing tape roll, wherein a width of the sealing tape roll is defined as the distance between one end surface and the opposite end surface of the sealing tape roll; wherein the sealing tape comprises a plurality of foam plies (20, 22, 42), which are arranged one above the other in the thickness direction between the bottom surface and the top surface of the sealing tape, wherein the at least one barrier layer is accommodated between a pair of adjacent foam plies (20, 22, 42); wherein the at least one barrier layer is configured to impact a water vapor diffusion within the sealing tape in a direction transversely to a functional direction of the sealing tape, wherein the functional direction is oriented perpendicularly to side surfaces (10, 12) and parallel to the bottom surface of the sealing tape; wherein the at least one barrier layer extends over at least 50% of the width of the sealing tape roll between the opposite end surfaces (16, 18) of the sealing tape roll and in the longitudinal direction of the sealing tape; and wherein the at least one barrier layer is arranged parallel to the bottom surface and has a thickness of between 1 and 500 μm; characterized in that the at least one barrier layer is composed of a film strip of polyamide, polyurethane, polypropylene or copolymers thereof. wherein the sealing tape comprises a top surface, a bottom surface, two side surfaces (10, 12) connecting the top surface and the bottom surface to each other, a longitudinal direction, which is parallel to the bottom surface and to the side surfaces (10, 12), and a thickness direction, which is perpendicular to the bottom surface of the sealing tape; wherein the sealing tape is wound up into the sealing tape roll around an axis, which is arranged transversely to the longitudinal direction of the sealing tape, in such a way that the top surface of one turn rests against the bottom surface of an adjacent turn of the sealing tape roll, and the side surfaces (10, 12) of the sealing tape form end surfaces (16, 18) of the sealing tape roll, wherein a width of the sealing tape roll is defined as the distance between one end surface and the opposite end surface of the sealing tape roll; wherein the sealing tape comprises a plurality of foam plies (20, 22, 42), which are arranged one above the other in the thickness direction between the bottom surface and the top surface of the sealing tape, wherein the at least one barrier layer is accommodated between a pair of adjacent foam plies (20, 22, 42); wherein the at least one barrier layer is configured to impact a water vapor diffusion within the sealing tape in a direction transversely to a functional direction of the sealing tape, wherein the functional direction is oriented perpendicularly to side surfaces (10, 12) and parallel to the bottom surface of the sealing tape; wherein the at least one barrier layer extends over at least 50% of the width of the sealing tape roll between the opposite end surfaces (16, 18) of the sealing tape roll and in the longitudinal direction of the sealing tape; and wherein the at least one barrier layer is arranged parallel to the bottom surface and has a thickness of between 1 and 500 μm; characterized in that the at least one barrier layer is composed of a film strip of polyamide, polyurethane, polypropylene or copolymers thereof.