Looking to move soon, the survey done on a bungalow reports slight dampness low down on the inside of some external walls. The building was cavity insulated with Instafoam in 2007. Anyone know of any dampness caused by Instafoam (which has a 25-year warranty).
The possible cause suggested by the surveyor was that the damp-proof course was less than 150mm from the surrounding ground (which is currently only 75-100mm below), so the ground level needed lowering.
Can anyone here recommend a UK damp specialists who could check the situation and give a diagnosis?