Damp in our flat - oil based undercoat

nickj_2

terra_ferma wrote: »

just a word of warning, we have used this type of paint and it's made condensation worse because the wall now doesn't absorb moisture, so the amount of condensation on the windows has increased considerably and the water drips down into the skirting boards.
The walls are also dripping wet, it's really bad.
The walls are mould free though, at least were we have used it (we didn't used it for the whole room, just external-facing walls).
We are going to remove it and paint with ordinary paint before the next winter.

paint cannot make condensation worse -it may make your condensation problem more apparent - you do not want moisture soaking into the wall- this will lead to mould , paint peeling /flaking .
the cause of your condensation is insufficient ventilation ,you need to sort this out before worrying about the paint ,

terra_ferma

nickj wrote: »

paint cannot make condensation worse -it may make your condensation problem more apparent - you do not want moisture soaking into the wall- this will lead to mould , paint peeling /flaking .
the cause of your condensation is insufficient ventilation ,you need to sort this out before worrying about the paint ,

you are wrong, paint doesn't effect damp, but it effects the amount of condensation:

Condensation is the change of the physical state of matter from gaseous phase into liquid phase

Less water is absorbed by walls and more is turned into water.
The amount of air humidity doesn't change, but the level of condensation does, making the problem worse.
However the underlying problem is still there, you are right in that respect.

Odster

If the flat freeholders allow it, I would vent the tumble dryer properly. If you poke the hose out of a window on a cold day, the dense, cold outside air will create a draft going into to the flat, and is likely to drag the damp tumble dryer air with it.