Hi, i got my roof replaced 2 years ago, new felt and slates, also had my attic converted into another bedroom, but afraid the company went bust afterwards, i now have dripping from the nails, and was told its condensation they put in 3 roofing vents but aint helped, still getting alot of water dripping from the nails in the roof and running down the walls to the rooms below and marks have appeared on attic walls, i was told it was due to the attic loft being warm and outside being cold which is making the condensation, have spent thousands on trying to fix the problem without any luck, i was told by the slater that just came out was due to they used non breathing felt instead of breathing. anyone have any idea what i can do without spending thousands more replacing the felt, can u buy equipment to cool the loft space to fix the problem or is replacing the roof again the only option.
Roof Condensation Problem
- Thread starter shaky120
- Start date
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thx for the reply, i was told that by the slater but wasnt sure if it was the best option, as ive had new damp patches appear since getting in the vents 2 weeks ago, any idea how many vents are usually needed in a slated house
What size is the air gap between the underside of the slate battens and insulation above the plasterboard? Was this passed by Building Control?
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soffit vents and continuous vented ridge 
Hi
The problem you have is warm moisture laden air from the rooms below coming into contact with a cold surface.
The easy solution would be to introduce a vapour barrier across the ceiling - temporarily remove any insulation, drape the vapour barrier over the ceiling joists and across the ceiling - you will need to tape joints -overlap by around 100mm - . Once done, replace insulation.
Regards
The problem you have is warm moisture laden air from the rooms below coming into contact with a cold surface.
The easy solution would be to introduce a vapour barrier across the ceiling - temporarily remove any insulation, drape the vapour barrier over the ceiling joists and across the ceiling - you will need to tape joints -overlap by around 100mm - . Once done, replace insulation.
Regards
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