Question: what could be the causes if I have damp in my sons bedroom?
It’s in the corner of his room. It’s made the wallpaper come away and there are like black patches on the wall. There is a fall-pipe on the external wall that allows the rain on to a lean to roof on a bay window. There are no signs showing on the ceiling of the bay window. The lead flashing looks generally sound apart from some mortar that may be missing. Are there DIY treatments I can buy to seal the flashing and also apply to the internal wall to provide a barrier to stop the damp returning?
Answer:
Answer by maps3333
i think we need pictures



