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I was putting some stuff in the loft of my Victorian house (UK) and found the roof was dripping wet on the inside and it is wet pretty much everywhere, not just in one area.

I have looked at the roof on both sides and don't see anything obvious.

I was looking for a slate that was out of place but couldn't see anything. Even if there was a dislodged slate that wouldn't explain why it's wet everywhere.

Any ideas what could be the cause?

Below are some photos from today but it was much worse a few days ago and there were small puddles on any of the plastic bags up there.

Front enter image description here

Back enter image description here

Inside loft enter image description here

2 enter image description here

Inside loft video Video inside loft

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    Depending on insulation and air movement, it could be condensation (if warm, moist air from inside the ouse is getting up and hitting the underside of a cold roof) - "pretty much everywhere" is my clue here - roof leaks don't tend to do that, but condensation does. – Ecnerwal Feb 2 at 22:57
  • Is that the backside of the slate with all the beads of water on it? If it is I fully agree with Ecnerwal, place a glass of ice water in the room and if the glass starts dripping you have proved that there is a lot of moisture in your loft and ventilation is needed or a dehumidifier. – Ed Beal Feb 3 at 2:13
  • Yes it's the back side. See the video here photos.app.goo.gl/xjC5AQ5x8pgJkZaKA Condensation was my first thought but 1 l have never seen it before (I don't go to the loft often but at least twice a year for 7 years) and 2. It is very wet. – J12966 Feb 3 at 21:29
  • I agree with the diagnosis. Condensation is very wet. :). It does look like condensation. If you look twice a year you might not see it. This will happen when it's cold outside and warm and humid inside. – jay613 Mar 5 at 1:50
  • @Ecnerwal you should write that up as an answer. – FreeMan Mar 5 at 14:11
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If you want to identify where the leak is coming from, get a buddy and have him spray your roof with water using a hose while your in the loft looking for water. Have him start from the low point of the roof and slowly work his way up. Sine you don't sound like a roofer I'd say this is your easiest way to find the leak.

Don't forget to give me a thumbs up so I get credit for helping you.

Good luck

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