A screening arrangement for a roof window, the roof window having a window opening, a frame structure and a sash structure extending in parallel to the roof surface, each with top (3a, 4a) and bottom members (3d, 4d) and two mutually parallel side members (3b, 3c, 4b, 4c), the screening arrangement comprising: a screening body having two side edges and a predefined length between a first end portion and a second end portion, said screening body being movable in a longitudinal direction between a non-screening position and a first screening position in which the screening body substantially covers the window opening, a top casing configured to extend substantially in parallel with the top member of the frame and sash structure, a roller shaft accommodated in the top casing and connected to drive means, the drive means being configured to rotate the roller shaft in a winding direction and an unwinding direction, the first end portion of the screening body being connected to the roller shaft such that the screening body is wound on the roller shaft in the non-screening position, a winding device comprising at least one winding reel in connection with the roller shaft, a bottom profile extending substantially in parallel with the top casing between two ends and connected to the second end portion of the screening body, side rails (21, 22) extending substantially in parallel with a respective side member of the frame and sash structure and configured to guide at least the ends of the bottom profile, a cord system including at least one guidance cord having a first end in connection with the winding device and a second end in connection with the bottom profile, and which is configured to apply a tensioning force to the screening body, at least one return element for the at least one guidance cord, a tensioning device accommodated in the bottom profile and comprising at least one spring device for tensioning the at least one guidance cord with a spring bias, characterised in that the bottom profile further comprises a shielding device extending longitudinally between a first end and a second end, and that the tensioning device is at least partly accommodated within the shielding device between the first end and the second end, such that the tensioning device with the shielding device is positioned in the bottom profile, the shielding device acting as a dampening element or silencer of the tensioning device relative to the bottom profile. a screening body having two side edges and a predefined length between a first end portion and a second end portion, said screening body being movable in a longitudinal direction between a non-screening position and a first screening position in which the screening body substantially covers the window opening, a top casing configured to extend substantially in parallel with the top member of the frame and sash structure, a roller shaft accommodated in the top casing and connected to drive means, the drive means being configured to rotate the roller shaft in a winding direction and an unwinding direction, the first end portion of the screening body being connected to the roller shaft such that the screening body is wound on the roller shaft in the non-screening position, a winding device comprising at least one winding reel in connection with the roller shaft, a bottom profile extending substantially in parallel with the top casing between two ends and connected to the second end portion of the screening body, side rails (21, 22) extending substantially in parallel with a respective side member of the frame and sash structure and configured to guide at least the ends of the bottom profile, a cord system including at least one guidance cord having a first end in connection with the winding device and a second end in connection with the bottom profile, and which is configured to apply a tensioning force to the screening body, at least one return element for the at least one guidance cord, a tensioning device accommodated in the bottom profile and comprising at least one spring device for tensioning the at least one guidance cord with a spring bias, characterised in that the bottom profile further comprises a shielding device extending longitudinally between a first end and a second end, and that the tensioning device is at least partly accommodated within the shielding device between the first end and the second end, such that the tensioning device with the shielding device is positioned in the bottom profile, the shielding device acting as a dampening element or silencer of the tensioning device relative to the bottom profile.