Looba45

And no leak just an old extractor fan that sounds quite haggard and is coming out the wall so the steam could be coming back in through the existing eve vent. I installed the eve vent when I did the roof it's just that there's not a 50mm air gap That can take the air up to the ridge line. was planning on installing 8 altogether. 2 either side just where the air gap gets tight 20mm so could be sucked in the eve and put the vent and 4 at the top 2 low down just above the 20mm gap and 2 higher up in the hopes air will flow through one side and out the other.

Sorry by damp proofing I meant vapour barrier to keep moisture in. And will definitely try what you said and see how it goes, thanks.

Iknow the diagram of the roof vents I've drawn is far from detailed but wondering if where I'm planning on placing the vents will help with the intake/ outtake and airflow, never had a problem with condensation before the new roof. And just wanting a cheep fix while Christmas time is always hard financially.

The condensation mould is not in the room it's on the felt/rafters and eve storage cupboard that is separate to the bedroom.

Yes the membrane was installed correctly and the loft room was there when moved In. it's just the roof that is new. It is only used for sleeping in and doesn't get much heat. I have been wondering if re plastering with a damp proofing behind the plaster would help? As a solution in the future. The eves cupboard is in the cold part of the roof where the air flow is and shower /bathroom underneath with an old extractor fan.

The loft room is all plasters and finished with 2 velux and dormer.

I've brought an electric dehumidifier to try and stop the moisture and it is 50mm recticel insulation board with expanding foam to stop heat gaps. The mould is gathering on the breathable felt and picture frames stored in the eve cupboards there is insulation board between all the roof rafters and floor joists in the the eve cupboards.

Hi everyone hope you're all well and enjoying the warm spell. In need of some help with my roof which I did myself (novice roofer/builder) in the summer. Looking for advice and not criticism please! I have a loft bedroom and it has recently been plagued with bad condensation and mould, and I believe the issue is that there isn't enough air flow between the insulation and felt. I was wondering if installing vents in certain locations as on the drawing I've done will help or just make things worse. It's a fiber slate roof with breathable felt, eve vents and dry ridge with the felt cut at the ridge. Holding my hands up, this was a big lesson, I opted for more warmth than airflow and I'm paying for it now. Just wanted to see if what I suggested is an option to avoid having to get the scaffold back up and the insulation board swapped. Thanks