Hi we had a new roof fitted in March. New felt, battens and tiles.
The attic conversion room. As I was putting the xmas decorations away, I decided to have a nosey under the roof. I noticed on a couple of bits of felt there is a moisture on the inside of the felt.
Now don't get me wrong ours is a 1900s mid terraced, back to back in West Yorkshire, so it's not the best insulated house ever.
I was just wanting to know if this moisture is normal or is it the area of felt that isn't doing its job?
Thanks in advance
Are you a tradesperson and able to answer this question?
Theres a very high chance at this time of year the moisture is condensation and not water ingress from the outside. Although I'm not a roofer so Im sure someone better qualified than me will provide better detail.
This time of year its almost certainly condensation, especially if the insulation isnt the best or done badly. Ideally upgrade the insulation so that the hot air doesn't come into contact with the cold and install vent tiles.
You will probably find in a couple of months when the worst of the cold weather has passed that it will stop happening.
If you have condensation in the roof void, then this would need ventilating. There are several ways to deal with this.
The eaves need ventilating at eaves all sides of the roof. Also to vent higher up.
This can be done by vent ties.
The are several types of vents for lower and higher ventilation.
Answered25 January 2021
1
Anonymous user
It’s sounds like condensation, your new roof should have fascia vents and dry ridge system installed to combat this though, I’d post a job lead and get a roofer out to checkout the air flow of the roof and make necessary adjustments to improve air flow to get rid of any trapped moisture.
Regards
Frankie
BT Roofing Services
