NOW OPEN: the MSE Forum 'Ask An Expert' event. This time we'd like your questions on TRAVEL & HOLIDAY DEALS. Post by Wed and deals expert MSE Oli will answer as many as he can.
Condensation in loft.
in In my home (includes DIY) MoneySaving
87 replies 6.4K views
Latest MSE News and Guides
Energy Price Cap change
Martin Lewis on what it means for youMSE News
Best £1 you've ever spent?
Share your most impressive bargainsMSE Forum
New MSE Forum avatars available
Try 'em out nowMSE Forum
I went in the loft yesterday and there was no condensation on the felt.
The boards had mostly dried out, and I couldn't see any signs of the exposed insulation being wet. I haven't been able to look at all of it yet, but I was encouraged by what I saw.
I haven't got any lap vents yet, but it is on the to do list.
Also the felt (I think you still call it felt as its the black bitumen type) is looser at the seams than some of the pictures from the vent vendors, but they are not so loose that they are flapping or at risk of ripping. I think Ashe discussed it.
Thanks again for all the replies and support, I understand the problem much better now.
Hi, it looks like you need require additional ventilation. From previous experience from our previous house, there was a design of vents which you can fit into the insulation to aid this. May have been covered above already. Hope this helps.
Interesting, I wonder how vent in the insulation works. - I just made sure there was a gap between the top of the insulation and the bottom of the loft board.
I'm particularly grateful to grumbler & Norman_Castle for the clear and comprehensive explanations.
Yes, I'm plugging those gaps into my loft - around pipes & light fittings.
Yes, I'm planning to lay more (thicker) loft insulation.
Yes, I'm going to stop worrying so much about the water pipes in my loft - which are (after some recent patching-up) reasonably well-lagged.
Wishing you a Happy New Year, Vicky
Electricity: about 3kw south facing solar array, EV, Octopus intelligent, thinking about getting a battery...
However, now, with the warmer temps and more airflow externally, its very dry and there is a very noticeable breeze as soon as I poke my head through the hatch. So I believe the lap vents work providing there is sufficient air movement outside but on their own aren't enough for very cold, still weather. But then would anything else fare better?
Proof in the pudding will be whether the condensation comes back if we have a prolonged cold snap again, but for now seems to have worked.
Can't remember if I said, but I also moved the felt lap vents a couple of times - first time I installed them the felt overlaps were way to big to actually create any more ventilation so when putting them in make sure they are actually helping.