Damp Patch Near Velux Window

Dec 7, 2021
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United Kingdom
I have recently had a new slate roof along with replacement velux windows. I’ve recently had the area around the velux plasterered ready for painting. In the last few weeks a damp patch has appeared.

I have had the roofer back out to have a look who has been up and says that the roof is 100% watertight so it is not water coming through.

The strange thing is it seems to happen when it is cold first thing in the morning. The roofer suggested condensation internally, I have a extractor fan and ducting exiting through the roof probably a few feet above where the velux is.

I have been in to the loft and had a look around and cannot see anything obvious. I need to have another proper look really but the loft space is fairly limited.

Anyone got any suggestions as to what this could be and how I can fix it ? I would be very grateful for any advice offered - thanks in advance.



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