Attic condensation

Peppa

Hoping someone can help here. I have a dormer bungalow and I just found a lot of condensation in the attic. When I bought the house I got the attic insulation upgraded and floored (c. 8 yrs). I did notice condensation once before but TBH never really up there. It is seems more like condensation as it is all over one side of roof kinda like top middle and end rather than concentrated in one area. I can see that the side with condensation is black liner all the way down and other side seems to be half way and then has a white liner and seems to move more in the wind but that could be wind direction. Is it more likely to be blocked vent, too much stored blocking air flow (where is air supposed to come in?) or a leak? Apologies but I am a clueless with no idea of DIY (in case that wasn't obvious!! ) but would like to have some idea of how this works before I get a professional in so I am not paying for something that isn't needed. I tried googling but it doesnt make sense they all talk about vents which I don't see. Insulation is wool and is right out to sides. I can't see gable ends as too much stuff there for tonight to move. House about 24 yrs old. SemiD. I will try take everything out at weekend to look properly but just what should I be looking for? Apologies again for what probably seems like basic questions but I am in a bit of panic mode here. I put a dehumidifier up there for now to try help but I am away until late tomorrow so that won't be long filling up. Thanks for even reading this!

IMG_20241205_222339.jpg

IMG_20241205_221136.jpg

10-10-20

Hi, yes, a few spots of condensation there alright, but don't panic!

Question: what county are you in and were those photos taken tonight? Reason that I ask is that as a data-point it's relatively windy out tonight and the country average temperature is around 4C.

Tw obvious things to check: if you lift up the insulation do you see a foil covered ceiling plasterboard or just a bare grey plasterboard? Secondly do you have any ceiling vents in any bathrooms which route through the attic? Just check that there is a flexible exhaust vent pipe running from these and over to the eves, and then routed out to a soffit vent.

OtOther than that I'll guess that you are missing some soffit vents, not a difficult issue to resolve if I'm honest.

Peppa

Thank you so much. That is a relief to hear. Yes taken last night. On Kilkenny/Carlow border. Bathrooms no vent via attic - that's a whole other issue. Will check what is underneath tomorrow as away today. Checked dehumidifier and was only a bit of water in it (honestly thought it would be full) but that black liner is still showing same condensation.

Field east

had that problem. A few Yeats ago in house built circa 1995. Rafters in places were showing moisture. Solved by replacing a few slates with vents

10-10-20

https://www.boards.ie/discussion/comment/122927785#Comment_122927785

The dehumidifier if it's a compressor type won't work effectively in a cold attic - they need higher temperatures to operate.

The Continental Op

These internal felt lap vets can help improve airflow and reduce that type of condensation

https://www.amazon.co.uk/Vents-Condensation-Ventilation-Prevents-Airflow/dp/B0D77NH9LW

Edit> Not sure the dehumidifier is worth the effort? If there is good air flow up in the attic then you might as well put the dehumidifier in the yard.