Hi, My apartment that I have lived in since it was built (now 18 months) has developed marks on the painted plaster board. I only noticed these marks after about 15 months from when the apartment was first built. The only way to describe them is that someone has put there fingers in grease and created a speckled effect all over the wall. It has only happened on the walls that are on outer walls but these are not Westerly facing (apparently this wall is normally the coldest and attracts moisture). I did have a picture frame on one of these walls and after taking it off the back of it was covered in mildue.
The apartment is under NHBC 10yr (not that it counts much) and I’ve had the builders out but they have been unable to explain it apart from lack of ventilation \ drying. They recommended treating it with a stain block type substance and decorating but I'd rather sort out what the problem is, any ideas?
James