I have condensation in four rooms. Two years ago I was told 1 metre of the felt needed replacing on the roof. I had this done now there are black areas again on the ceilings. Some Roofers have said I need air vents fitted in the rooms, two have said the loft insulation needs replacing as it goes right up to eaves and causing condensation. They said a lot of moisture in the loft and insulation around the sides was wet.
Please can someone advise? Thanks
