Second hand so bear with me!
Daughters Edwardian terrace, North London, has always shown evidence of damp in the basement area. Used as a kitchen/dining/living area and with no extract system in place hardly a surprise.
Some recent building work included re-plastering the solid brick wall next to the garden exit.
The skim coat blew off within a few months of the builders leaving site.
A firm specialising in damp consultancy were brought in and I now have a copy of their report. They *measured* relative damp and moisture content and did thermal imaging.
In view of previous adverse comment on damp investigation I thought running their recommendations though here worthwhile:-)
Basically, fit an extractor. OK
Also strip off exterior render made non-porous by non breathable paint. Replace with breathable lime based render and lime wash for decor.
Any internal plastering should be undertaken using a lime based plaster only.
I am no plasterer but visually it looked as if the internal plaster skim was not *attached* to the base coat either by scratching or unibond and that, while condensation is undoubtedly present, this is not the cause of the blowing.
Thoughts?