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when i moved into my dormer roofed flat i couldn't understand what the stripes were on the flat part of the dormer ceilings, turns out it was the joists cold bridging more than the plasterboard.
There was no insulation in the dormers since built, luckily i'm a skinny bugger so i could crawl in there and put 270mm in. right arse of a job and i ended up covered in bruises down my front from wriggling in there.
Mr_Smyth-
I know there was insulation in the flat roof originally as the roofer sent me photos as he was ripping out the rotten stuff while replacing the boards and felt. However, I wouldn't trust that he put new stuff back in. Looking at the humidity levels on Tado, it's now closer to 50% rather than the 70% it was yesterday morning. I'll ask later if there was a visible difference.
stevo_com
Lodger told us this morning that there was condensation on her ceiling and windows (old DG units and flat dormer loft extension + coldest day so far since moving in). She has been not turning the heating on as much due to fear of costs to us. So reset her heating schedule and bought her a dehumidifier.