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Condensation in loft.
in In my home (includes DIY) MoneySaving
87 replies 6.4K views
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10 was almost enough for my tiny loft space, but might buy a few more if the problem still occurs. I have also pushed down the insulation by the eaves so there is an air gap (quite a lot of it was blocking the airflow!) so hopefully those two things combined will get the ventilation going adequately. I'm also gonna leave my dehumidifier up there for a few hours on constant see if I can get the humidity down below 50 (was 81 when I started it!!!)
Oh yeah one final word of warning - anyone else with the real "smart" idea to use a window vacuum on the felt to get rid of the water... Don't. I only bought mine this week and I fear I have already ruined it with bits of black (which I am assuming is plastic rather than mould, but you never know...). Next time paper towels, for sure.
for me out ceiling in bedroom is 12c and loft hatch is 7.5c so it's obviously much colder therefore leaching heat; that hotter air then gets into loft and helps the condensation form, so it's a combination of wanting airflow to ventilate but also stop the heat getting there in the first place
Before roofs were insulated, condensation was less of a problem.
When you add insulation to an old house it's important to make sure there is adequate ventilation.