Hi.
My semi-basement flat (it's about 2 feet below ground level, though there's a drainage channel a foot wide around 2 of the 3 sides) is mostly dry-lined.
Over the past year or so, the nails/screws have started to lump and become discoloured, mainly restricted to one side of the flat. What's odd is that they were fine the the previous 7 years I've been here so I'm unsure why it's occurring now. Maybe the fastenings have a finite 'anti corrosion' period and have all gone at the same time, maybe there's water ingress from a broken drain, or just moisture build up in the void. Maybe it wasn't done correctly back in the 70s when first converted.
The pic below shows the external wall that's closest to the worst-affected internal walls. That moss growth suddenly stopping and starting looks suspicious to my untrained eye.
The flat has always suffered from condensation issues (or possibly rising/penetrating damp) as I've had to run a dehumidifier but windows always soaking wet, despite each one having a vent-o-matic fan/vent in them, and mould grows on coats etc hanging in hallway after a few months. Walls have always felt bone-dry however with no mould.
Ideas/advice welcome.
Cheers!
My semi-basement flat (it's about 2 feet below ground level, though there's a drainage channel a foot wide around 2 of the 3 sides) is mostly dry-lined.
Over the past year or so, the nails/screws have started to lump and become discoloured, mainly restricted to one side of the flat. What's odd is that they were fine the the previous 7 years I've been here so I'm unsure why it's occurring now. Maybe the fastenings have a finite 'anti corrosion' period and have all gone at the same time, maybe there's water ingress from a broken drain, or just moisture build up in the void. Maybe it wasn't done correctly back in the 70s when first converted.
The pic below shows the external wall that's closest to the worst-affected internal walls. That moss growth suddenly stopping and starting looks suspicious to my untrained eye.
The flat has always suffered from condensation issues (or possibly rising/penetrating damp) as I've had to run a dehumidifier but windows always soaking wet, despite each one having a vent-o-matic fan/vent in them, and mould grows on coats etc hanging in hallway after a few months. Walls have always felt bone-dry however with no mould.
Ideas/advice welcome.
Cheers!