Method for producing a roll of sealing tape having a plurality of internal barrier layers (34, 46), each of which extends over at least 50% of the width of the roll of sealing tape between mutually opposite end faces (16, 18) of the roll of sealing tape, said method having the following steps: a) providing a first foam web of a soft foam that has a top side, a bottom side and two side flanks (10, 12) which connect the top side and the bottom side, wherein a longitudinal direction is defined as parallel to the bottom side and parallel to the side flanks (10, 12) and a transverse direction is defined as parallel to the bottom side and perpendicular to the longitudinal direction; b) applying a first barrier layer to a first surface of the first foam web so as to form a laminated foam web, wherein the first surface corresponds to the top side or bottom side of the first foam web and a second surface corresponds to the respectively other one of the top side and bottom side of the first foam web; c) introducing a plurality of first cuts into a top side of the laminated foam web in the transverse direction and introducing a plurality of second cuts into a bottom side of the laminated foam web in the transverse direction and respectively offset in the longitudinal direction with respect to a first cut so as to form strips arranged one behind another in the longitudinal direction, wherein a connecting portion remains between two strips that adjoin one another; d) folding over the strips in the region of the connecting portions so as to produce a foam barrier-layer sheet, in such a way that sub-portions of the top side of the laminated foam web that adjoin a common connecting portion lie opposite one another and sub-portions of the bottom side of the laminated foam web that adjoin a common connecting portion lie opposite one another; and e) forming a roll of sealing tape by (i) winding up the foam barrier-layer sheet around an axis of rotation so as to form a roll of sealing tape; or (ii) winding up the foam barrier-layer sheet around an axis of rotation so as to form an intermediate roll and severing the intermediate roll at one or more points in an axial direction, in order to create a plurality of rolls of sealing tape that are less wide than the intermediate roll; or (iii) introducing at least one cut into the foam barrier-layer sheet in a longitudinal direction of the foam barrier-layer sheet so as to form foam barrier-layer strips, and winding up the foam barrier-layer strips around an axis of rotation so as to form individual rolls of sealing tape. a) providing a first foam web of a soft foam that has a top side, a bottom side and two side flanks (10, 12) which connect the top side and the bottom side, wherein a longitudinal direction is defined as parallel to the bottom side and parallel to the side flanks (10, 12) and a transverse direction is defined as parallel to the bottom side and perpendicular to the longitudinal direction; b) applying a first barrier layer to a first surface of the first foam web so as to form a laminated foam web, wherein the first surface corresponds to the top side or bottom side of the first foam web and a second surface corresponds to the respectively other one of the top side and bottom side of the first foam web; c) introducing a plurality of first cuts into a top side of the laminated foam web in the transverse direction and introducing a plurality of second cuts into a bottom side of the laminated foam web in the transverse direction and respectively offset in the longitudinal direction with respect to a first cut so as to form strips arranged one behind another in the longitudinal direction, wherein a connecting portion remains between two strips that adjoin one another; d) folding over the strips in the region of the connecting portions so as to produce a foam barrier-layer sheet, in such a way that sub-portions of the top side of the laminated foam web that adjoin a common connecting portion lie opposite one another and sub-portions of the bottom side of the laminated foam web that adjoin a common connecting portion lie opposite one another; and e) forming a roll of sealing tape by (i) winding up the foam barrier-layer sheet around an axis of rotation so as to form a roll of sealing tape; or (ii) winding up the foam barrier-layer sheet around an axis of rotation so as to form an intermediate roll and severing the intermediate roll at one or more points in an axial direction, in order to create a plurality of rolls of sealing tape that are less wide than the intermediate roll; or (iii) introducing at least one cut into the foam barrier-layer sheet in a longitudinal direction of the foam barrier-layer sheet so as to form foam barrier-layer strips, and winding up the foam barrier-layer strips around an axis of rotation so as to form individual rolls of sealing tape. (i) winding up the foam barrier-layer sheet around an axis of rotation so as to form a roll of sealing tape; or (ii) winding up the foam barrier-layer sheet around an axis of rotation so as to form an intermediate roll and severing the intermediate roll at one or more points in an axial direction, in order to create a plurality of rolls of sealing tape that are less wide than the intermediate roll; or (iii) introducing at least one cut into the foam barrier-layer sheet in a longitudinal direction of the foam barrier-layer sheet so as to form foam barrier-layer strips, and winding up the foam barrier-layer strips around an axis of rotation so as to form individual rolls of sealing tape.