I have read previous advice on your site re this topic but even after having cavity wall and loft insulation fitted still have a major problem with condensation. The loft seems to be worse since having the insulation fited and is dripping with condensation. My 2 front bedroons have black spores in the front facing corners and along the all off the window frames on this floor. There doesn't seem to be a problem with downstairs windows/ceilings. I try to clean this away and open the windows as much as possible - this helps but the problem always returns.
Could the windows be the problem? They are standard UPC double glazed and have been in the house since built around 1980. Advice on your site suggested they may need trickle vents. Can these be fitted or will windows have to be replaced? Also could there be a problem with the ventliation in the loft ? Would this be costly to fix?
We need to try and fix this problem as cheaply as possible as we want to sell in the not to distant future. Can anyone help, please?!