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Out of curiosity, you might have said before, what's the floor inside?
I had to take up some mouldy self leveling compound that was put down on damp concrete and masonry paint on walls, and the walls and floor dried in front of me.
Kurai-
Concrete flooring with engineered fake wood stuff ontop with a plastic sheet membrane between. Surveyor was suitably happy the floor was OK.
It is unclear if there is a membrane under the concrete and linked to the DPC to form an impervious layer but I assume not so the concrete is probably somewhat damp.
The skirting board in direct contact with the floor however is OK and doesn't have elevated dampness at all.
He's going to share a full list of recommendations, he was somewhat stumped too as he said usually there is something glaringly wrong.
apc
had a surveyor round to advise on what needs doing to solve damp issues.
One point was to remove render to above DPC level as it is currently going all the way to the ground. This will allow the wall to breathe where the damp is and also stop any damp working its way behind the render from touching the ground.
May DIY it, what tools would be required? Angle grinder? impact drill with chisels? Anyone advise against DIY?