I'm looking at a terraced house on which I've found damp and discolouration up the wall, along and up to the ceiling above (to the loft). This is happening on the shared wall between the houses.
There's no upstairs plumbing so I'm hoping it's clogged gutters or something. If it was not this, what else could it be? If it was something more sinister how would I go about fixing it?
The discolouration at the moment is not bad. It's a yellow/off-white colour. But what are the implications? I assume it will only get worse.
Thanks in advance for any advice given.
I would add [damp] to the tags but this is my first time on the diy stack exchange site and I'm unable to make that tag with no reputation.