A landlord that I am contracted to, has had a problem in one of his flats with major condensation, & the tenant constantly complaining & us trying to cure the problem as best we can. We put a vent in the wall, then that was later amended to an extractor fan a few months later, & made very little difference. I bumped into a builder mater of mine & asked him for some ideas, & he said has the bathroom got a shower curtain or a shower screen, I must admit I did look at him a bit daft tbh, I told him that it was a shower curtain, he replied quite sternly RIP it out & install a shower screen, I told him I thought he was pulling my leg, (as he is quite a joker), he said seriously, a shower screen will make all the difference. after we finished our convo & went our separate ways I started thinking if this could be a plausible idea & also clutching at straws, I broached the idea to the landlord & after much deliberation, he said funny enough I have another flat a few doors away from the affected flat with exact same layout, & viola (you guessed it) a shower screen & the tenants there do not have a problem, & then gave me the go ahead to fit a shower screen. The screen was fitted yesterday morning & the tenant called the landlord to say thank you & to thank me again for installing the shower screen as there was hardly any condensation after she had her daily shower. I do not know the science of how it has helped, but I was very surprised that it has. Have you came across anything like this on your travel(s) ??
I'm popping over there Monday to complete other works weather permitting as its outside, fixing the fence, When I am there I will ask the tenant if I can see the result for myself, since I am curious & will post back With the shower curtain in place, the condensation was evident within a couple of minutes, even with the door & window open.
I have now seen seen it for myself & was amazed how just by swapping the curtain for a screen, actually reduced the condensation to virtually zero. That said I still can not explain the science of it though
I think its as Rulland has mentioned, the warmer water vapor condensing on the cold surface of the glass.