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Is this a bad thing or to be expected? There's a few vents and air bricks up there but not sure how many there should be.
If it's been cold but very little wind, the vents won't have been removing much of the warn moist air that's risen into the loft. Check back after a slightly warmer, breezy day.
If you have an extractor fan ducted through the loft, check the ducting is still attached.
Could you seal the loft hatch better?
Are there any other holes through the ceiling that allow heat/moisture to flow into the loft?
user69121
I was up in my loft yesterday (about lunchtime maybe) and noticed that a lot of the membrane on the north facing part was damp with drops of water on it. There's been no rain recently so I assume it's condensation. Standard Victorian terrace.
Is this a bad thing or to be expected? There's a few vents and air bricks up there but not sure how many there should be. Loft insulation was done about 10 years ago and about 200mm down so far as I can see.