Flynn weather or not if it's coming up the wall regardless it's rising ,taking into account everything else is ok ground lvls etc ,I tell ye what on Tuesday I have an appointment to see a damp project I don't know to what extent but I'll post and discuss,how dos that sit with you?the original post on here tells us that the existing s&c has a problem as the plaster kept blowing ,it would be good to see some out side pics I'll agree it could be as little as some pointing missing at low lvl then adding the bonding it's just spread.
I just suggested for the gentleman to cover all bases that would sort it,saying that if I were there I could do a more thorough inspection and come up with a proper solution .