Christian McArdle wrote:
The dampness is always in the first 18" above the skirting board.
The wall does not have a cavity and it's always cold. I suspect the
dampness in condensation rather than rising/penetrating,

Why do you think this?


It's the coldest surface in teh room, and I didn't think penetratin damp
would accumulate enough to run down and collect, whereas I know condensation
does that.

It could very well be a failed/missing/bridged damp proof course.

Indeed the concrete outside is at a slightly higher level than the floor
inside, however the damp inside does not seem to coincide with the damp
inside, ie it can be dry inside when rainy and wet inside when fine out.
Also the wall along which the damp is present is quite sheltered from the
rain, which doesn't collect.

This is easily remedied with a chemical injection. The expensive part
is replacing all the plaster.

Can the injection not be done from the outside?


If it really is condensation, this can be fixed by additional
insulation and ensuring adequete ventilation.

I just want to make sure I know where it comes from before I take measures.
Any tips?


Thanks

John