The skylight is sweating heavily. Lots of condensation in the morning.

In an older attic apartment, there is always the problem in winter that the roof window sweats heavily overnight. In the morning, the pane together with the frame is very wet. Probably because the glass is cold and the room temperature is higher. Room temperature about 18 degrees. The roof window is additionally closed on the inside from the room by a blackout blind. There is about 25 cm of "air" between the blind and the pane. The room itself is small. About 6 m2.

Does the window sweat so much overnight because the blind separates the roof window pane from the room air?

Without blackout, it is not possible because it would be too bright (street lighting).

Many thanks

Too little ventilation.

Too little ventilation.

Of course, ventilation takes place in the morning, at noon, and in the afternoon. But not during the night.

6 m2 room and your breathing air is too much, You can leave the door open, or keep the heating on, or leave the window open on ventilation or tilt

6 m2 room and your breathing air is too much, You can leave the door open, or leave the heating on, or leave the window open on ventilation or tilted

No, window open or tilted at below zero degrees... In winter even the lower edge of the window freezes, where the sealing runs. Heating is slightly on at night. That's why 19 degrees. Door always open. The blind (25cm away from the window) therefore does not cause problems regarding circulation? The blind must remain closed.

We also had that in the previous house. In winter, the roof window was wet or even frozen at the edge during severe frost.. The pane was only double-glazed. However, for us, it was just a heated storage room of about 10 sqm. My solution was then a simple mini fan (not a fan heater!) that constantly blew against the window.. That helped.