bobbydave

any one any idea what to do?

Apologies, we had vent tiles put on the roof (i had said air vents, i mean vent tiles). We have an extractor fan for the ensuite shower and the guy who put in the vent tiles ensured me that this is leading to the back and operating correctly. Windows have trickle vents and above the window is now fixed. I'll attach a video IMG_3868.mp4

I bought a new house 3.5 years ago in Ireland. We had a small 4th bedroom which we knocked to put in a full stairs to an already converted attic (there was a pull down stairs in another area that we closed up). Last year, i noticed we were getting mould over 4th bedroom window inside on the ceiling which spread like wildflower. It then started travelling up the new stairs ceiling. We had someone put in 4 vent tiles earlier this year. The issue disappeared. But now its back but not under the window this time. It is travelling up the new stairs ceiling again and making its way all the way and going back down the other side of the roof. Surely, I dont need more vent tiles? (4 vent tiles + labour = 600 euro). Any ideas to rid this once and for all?