We have a cold flat roof with a 1970s-style suspended office ceiling made of a metal grid frame and mineral fibre ceiling tiles. the ceiling has rock wool insualtion above it and still in good condition, with the original plastic vapour control layer and the roof has roof vents all around the...
We had similar. It was the guttering that caused the problem. Not obvious, but it looks badly placed. Over time, the water penatrates.
No need to put any barrier on the wall as all walls need to 'breath'. It is most certainly the gutters misplaced. check all along the building. Also,make sure...
Hi, I'm looking into this too as we had the same problem. Previous house double glazed with argon filled but never had condensation outside, regardless of temperature variation. It spoils the view and have to go outside to wipe the windows unfortunately.
Rebooting this thread as we have similar problem and wondered if you got any further with this. Check the water level in the area as you may have a high water table. Make sure it is ventilated to avoid condensation problems. Look under the floorboards if possible.. Did you find a company that...