Hi
I am very new to this sort of thing, in my first home, so please be nice and don't use to much technical jargon!
I live in a fairly old building which at one point or another was split up and converted into flats.
I've been re-decorating the bedroom and discovered an issue on one of the internal walls.
I took the old wallpaper off, sanded etc the plaster on the wall (Which was in pretty reasonable condition, no flaking or anything like that) and painted the wall white.
Within a week, this horrible, green stuff had started appearing on the wall. It's not damp to the touch, but that is obviously what it is.
Now, I'm not an expert, but I'm pretty sure it's got an old fire place underneath it - because my upstairs neighbor has an old fireplace uncovered in his living room directly above where this wall is in my bedroom.
I've been thinking that it might be worth trying to see what is underneath this plastering (It seems to be almost hollow in some places?) but I'm quite nervous as I have never attempted anything like this by myself before (Only ever when helping my dad when I was younger)
So what I'm asking really is - Any ideas as to what could be causing this? And any suggestions on what to do about it? Someone people have said to put PVA sealer on it (HA HA HA) but I can see that's a stupid idea as it would simply seal in the moisture and make the problem worse?!
Thanks!
I am very new to this sort of thing, in my first home, so please be nice and don't use to much technical jargon!
I live in a fairly old building which at one point or another was split up and converted into flats.
I've been re-decorating the bedroom and discovered an issue on one of the internal walls.
I took the old wallpaper off, sanded etc the plaster on the wall (Which was in pretty reasonable condition, no flaking or anything like that) and painted the wall white.
Within a week, this horrible, green stuff had started appearing on the wall. It's not damp to the touch, but that is obviously what it is.
Now, I'm not an expert, but I'm pretty sure it's got an old fire place underneath it - because my upstairs neighbor has an old fireplace uncovered in his living room directly above where this wall is in my bedroom.
I've been thinking that it might be worth trying to see what is underneath this plastering (It seems to be almost hollow in some places?) but I'm quite nervous as I have never attempted anything like this by myself before (Only ever when helping my dad when I was younger)
So what I'm asking really is - Any ideas as to what could be causing this? And any suggestions on what to do about it? Someone people have said to put PVA sealer on it (HA HA HA) but I can see that's a stupid idea as it would simply seal in the moisture and make the problem worse?!
Thanks!
