A building section having a wall and a component inserted into an opening in the wall, in particular a frame profile of a window or of a door, wherein in a gap between component and wall a sealing tape is arranged in a partly compressed installed state, sealing the gap, wherein the sealing tape comprises a main body of soft foam material that is recoverable after compression, wherein the sealing tape comprises a top, a bottom and first and second lateral flanks, which connect the top and the bottom, wherein the lateral flanks extend substantially perpendicularly to a functional direction of the sealing tape, wherein in the region of the bottom of the sealing tape an adhesive layer for adhering to the component is arranged, wherein the sealing tape comprises a barrier layer for reducing the water vapour diffusion and/or the air permeability in the functional direction, which is arranged in the region of one of the first and second lateral flanks and, in the completely expanded state of the sealing tape, completely covers a lateral surface of the main body arranged in this region; and wherein the top of the sealing tape has a profile with a depression in such a manner that the sealing tape, in a completely expanded state, in the region of the first lateral flank has a first height (h 1), in the region of the second lateral flank has a second height (h 2), which is substantially equal to the first height (h 1), and in a region between the first and the second lateral flank has a third height (h 3), which is less than each of first height (h 1) and second height (h 2), wherein the interior of the depression is exclusively filled with air, wherein in the partly compressed installed state the top of the sealing tape comprising the depression lies against the wall in the region of the lateral flanks of the sealing tape, while at least in the region of the original third height (h 3) it does not lie against the wall. wherein the sealing tape comprises a main body of soft foam material that is recoverable after compression, wherein the sealing tape comprises a top, a bottom and first and second lateral flanks, which connect the top and the bottom, wherein the lateral flanks extend substantially perpendicularly to a functional direction of the sealing tape, wherein in the region of the bottom of the sealing tape an adhesive layer for adhering to the component is arranged, wherein the sealing tape comprises a barrier layer for reducing the water vapour diffusion and/or the air permeability in the functional direction, which is arranged in the region of one of the first and second lateral flanks and, in the completely expanded state of the sealing tape, completely covers a lateral surface of the main body arranged in this region; and wherein the top of the sealing tape has a profile with a depression in such a manner that the sealing tape, in a completely expanded state, in the region of the first lateral flank has a first height (h 1), in the region of the second lateral flank has a second height (h 2), which is substantially equal to the first height (h 1), and in a region between the first and the second lateral flank has a third height (h 3), which is less than each of first height (h 1) and second height (h 2), wherein the interior of the depression is exclusively filled with air, wherein in the partly compressed installed state the top of the sealing tape comprising the depression lies against the wall in the region of the lateral flanks of the sealing tape, while at least in the region of the original third height (h 3) it does not lie against the wall.